This article is about the basics of light emitting diodes.
For application to area lighting, see LED lamp.
"LED" redirects here.
For other uses, see LED (disambiguation).
Not to be confused with LCD.
|Invented||H. J. Round (1907)|
|First production||October 1962|
|Pin configuration||Anode and cathode|
The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor.
White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light.
Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.
The first visible-light LEDs were of low intensity and limited to red.
Early LEDs were often used as indicator lamps, replacing small incandescent bulbs, and in seven-segment displays.
Recent developments have produced high-output white light LEDs suitable for room and outdoor area lighting.
LEDs have led to new displays and sensors, while their high switching rates are useful in advanced communications technology.
LEDs have many advantages over incandescent light sources, including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching.
LEDs are used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes, lighted wallpaper, horticultural grow lights, and medical devices.
Discoveries and early devices
Russian inventor Oleg Losev reported creation of the first LED in 1927.
His research was distributed in Soviet, German and British scientific journals, but no practical use was made of the discovery for several decades.
In his publications, Destriau often referred to luminescence as Losev-Light.
Hungarian Zoltán Bay together with György Szigeti pre-empted LED lighting in Hungary in 1939 by patenting a lighting device based on SiC, with an option on boron carbide, that emitted white, yellowish white, or greenish white depending on impurities present.
Kurt Lehovec, Carl Accardo, and Edward Jamgochian explained these first LEDs in 1951 using an apparatus employing SiC crystals with a current source of a battery or a pulse generator and with a comparison to a variant, pure, crystal in 1953.
Braunstein observed infrared emission generated by simple diode structures using gallium antimonide (GaSb), GaAs, indium phosphide (InP), and silicon-germanium (SiGe) alloys at room temperature and at 77 kelvins.
In 1957, Braunstein further demonstrated that the rudimentary devices could be used for non-radio communication across a short distance.
As noted by Kroemer Braunstein "…had set up a simple optical communications link: Music emerging from a record player was used via suitable electronics to modulate the forward current of a GaAs diode.
The emitted light was detected by a PbS diode some distance away.
This signal was fed into an audio amplifier and played back by a loudspeaker.
Intercepting the beam stopped the music.
We had a great deal of fun playing with this setup."
This setup presaged the use of LEDs for optical communication applications.
In September 1961, while working at Texas Instruments in Dallas, Texas, James R. Biard and Gary Pittman discovered near-infrared (900 nm) light emission from a tunnel diode they had constructed on a GaAs substrate.
By October 1961, they had demonstrated efficient light emission and signal coupling between a GaAs p-n junction light emitter and an electrically isolated semiconductor photodetector.
On August 8, 1962, Biard and Pittman filed a patent titled "Semiconductor Radiant Diode" based on their findings, which described a zinc-diffused p–n junction LED with a spaced cathode contact to allow for efficient emission of infrared light under forward bias.
After establishing the priority of their work based on engineering notebooks predating submissions from G.E.
Labs, RCA Research Labs, IBM Research Labs, Bell Labs, and Lincoln Lab at MIT, the U.S. issued the two inventors the patent for the GaAs infrared light-emitting diode (U.S. Patent ), the first practical LED. patent office
Immediately after filing the patent, Texas Instruments (TI) began a project to manufacture infrared diodes.
In October 1962, TI announced the first commercial LED product (the SNX-100), which employed a pure GaAs crystal to emit an 890 nm light output.
In October 1963, TI announced the first commercial hemispherical LED, the SNX-110.
Holonyak and Bevacqua reported this LED in the journal Applied Physics Letters on December 1, 1962.
M. , a former graduate student of Holonyak, invented the first yellow LED and improved the brightness of red and red-orange LEDs by a factor of ten in 1972. George Craford
In 1976, T. P. Pearsall designed the first high-brightness, high-efficiency LEDs for optical fiber telecommunications by inventing new semiconductor materials specifically adapted to optical fiber transmission wavelengths.
Initial commercial development
The first commercial visible-wavelength LEDs were commonly used as replacements for incandescent and neon indicator lamps, and in seven-segment displays, first in expensive equipment such as laboratory and electronics test equipment, then later in such appliances as calculators, TVs, radios, telephones, as well as watches (see list of signal uses).
Until 1968, visible and infrared LEDs were extremely costly, in the order of US$200 per unit, and so had little practical use.
Hewlett-Packard (HP) was engaged in research and development (R&D) on practical LEDs between 1962 and 1968, by a research team under Howard C. Borden, Gerald P. Pighini and Mohamed M. Atalla at HP Associates and HP Labs.
During this time, Atalla launched a material science investigation program on gallium arsenide (GaAs), gallium arsenide phosphide (GaAsP) and indium arsenide (InAs) devices at HP, and they collaborated with Monsanto Company on developing the first usable LED products.
Monsanto was the first organization to mass-produce visible LEDs, using GaAsP in 1968 to produce red LEDs suitable for indicators.
Monsanto had previously offered to supply HP with GaAsP, but HP decided to grow its own GaAsP.
Atalla left HP and joined Fairchild Semiconductor in 1969.
He was the vice president and general manager of the Microwave & Optoelectronics division, from its inception in May 1969 up until November 1971.
In the 1970s, commercially successful LED devices at less than five cents each were produced by Fairchild Optoelectronics.
The combination of planar processing for chip fabrication and innovative packaging methods enabled the team at Fairchild led by optoelectronics pioneer Thomas Brandt to achieve the needed cost reductions.
LED producers continue to use these methods.
The early red LEDs were bright enough only for use as indicators, as the light output was not enough to illuminate an area.
Readouts in calculators were so small that plastic lenses were built over each digit to make them legible.
Later, other colors became widely available and appeared in appliances and equipment.
Early LEDs were packaged in metal cases similar to those of transistors, with a glass window or lens to let the light out.
Modern indicator LEDs are packed in transparent molded plastic cases, tubular or rectangular in shape, and often tinted to match the device color.
Infrared devices may be dyed, to block visible light.
More complex packages have been adapted for efficient heat dissipation in high-power LEDs.
Surface-mounted LEDs further reduce the package size.
LEDs intended for use with fiber optics cables may be provided with an optical connector.
At the time Maruska was on leave from RCA Laboratories, where he collaborated with Jacques Pankove on related work.
In 1971, the year after Maruska left for Stanford, his RCA colleagues Pankove and Ed Miller demonstrated the first blue electroluminescence from zinc-doped gallium nitride, though the subsequent device Pankove and Miller built, the first actual gallium nitride light-emitting diode, emitted green light.
In 1974 the U.S. awarded Maruska, Rhines and Stanford professor David Stevenson a patent for their work in 1972 (U.S. Patent ). Patent Office
Today, magnesium-doping of gallium nitride remains the basis for all commercial blue LEDs and laser diodes.
In the early 1970s, these devices were too dim for practical use, and research into gallium nitride devices slowed.
SiC LEDs had very low efficiency, no more than about 0.03%, but did emit in the blue portion of the visible light spectrum.
Building upon this foundation, Theodore Moustakas at Boston University patented a method for producing high-brightness blue LEDs using a new two-step process in 1991.
Nakamura was awarded the 2006 Millennium Technology Prize for his invention.
In 2015, a US court ruled that three companies had infringed Moustakas's prior patent, and ordered them to pay licensing fees of not less than US$13 million.
In 1995, Alberto Barbieri at the Cardiff University Laboratory (GB) investigated the efficiency and reliability of high-brightness LEDs and demonstrated a "transparent contact" LED using indium tin oxide (ITO) on (AlGaInP/GaAs).
As of 2017, some manufacturers are using SiC as the substrate for LED production, but sapphire is more common, as it has the most similar properties to that of gallium nitride, reducing the need for patterning the sapphire wafer (patterned wafers are known as epi wafers).
Toshiba has stopped research, possibly due to low yields.
Some opt towards epitaxy, which is difficult on silicon, while others, like the University of Cambridge, opt towards a multi-layer structure, in order to reduce (crystal) lattice mismatch and different thermal expansion ratios, in order to avoid cracking of the LED chip at high temperatures (e.g. during manufacturing), reduce heat generation and increase luminous efficiency.
Epitaxy (or patterned sapphire) can be carried out with nanoimprint lithography.
GaN-on-Si is desirable since it takes advantage of existing semiconductor manufacturing infrastructure, however, it is difficult to achieve.
It also allows for the wafer-level packaging of LED dies resulting in extremely small LED chips.
White LEDs and the illumination breakthrough
Even though white light can be created using individual red, green and blue LEDs, this results in poor color rendering, since only three narrow bands of wavelengths of light are being emitted.
The attainment of high efficiency blue LEDs was quickly followed by the development of the first white LED.
The combination of that yellow with remaining blue light appears white to the eye.
Using different phosphors produces green and red light through fluorescence.
The resulting mixture of red, green and blue is perceived as white light, with improved color rendering compared to wavelengths from the blue LED/YAG phosphor combination.
The first white LEDs were expensive and inefficient.
However, the light output of LEDs has increased exponentially.
This trend in increased output has been called Haitz's law after Dr. Roland Haitz.
Light output and efficiency of blue and near-ultraviolet LEDs rose and the cost of reliable devices fell.
This led to relatively high-power white-light LEDs for illumination, which are replacing incandescent and fluorescent lighting.
Experimental white LEDs were demonstrated in 2014 to produce 303 lumens per watt of electricity (lm/w); some can last up to 100,000 hours.
However, commercially available LEDs have an efficiency of up to 223 lm/w as of 2018.
A previous record of 135lm/w was achieved by Nichia in 2010.
Compared to incandescent bulbs, this is a huge increase in electrical efficiency, and even though LEDs are more expensive to purchase, overall cost is significantly cheaper than that of incandescent bulbs.
The LED chip is encapsulated inside a small, plastic, white mold.
It can be encapsulated using resin (polyurethane-based), silicone, or epoxy containing (powdered) Cerium doped YAG phosphor.
After allowing the solvents to evaporate, the LEDs are often tested, and placed on tapes for SMT placement equipment for use in LED light bulb production.
Encapsulation is performed after probing, dicing, die transfer from wafer to package, and wire bonding or flip chip mounting, perhaps using Indium tin oxide, a transparent electrical conductor.
In this case, the bond wire(s) are attached to the ITO film that has been deposited in the LEDs.
Some "remote phosphor" LED light bulbs use a single plastic cover with YAG phosphor for several blue LEDs, instead of using phosphor coatings on single chip white LEDs.
The temperature of the phosphor during operation and how it is applied limits the size of an LED die.
Wafer-level packaged white LEDs allow for extremely small LEDs.
Physics of light production and emission
Main article: Light-emitting diode physics
In a light emitting diode, the recombination of electrons and electron holes in a semiconductor produces light (be it infrared, visible or UV), a process called "electroluminescence".
The wavelength of the light depends on the energy band gap of the semiconductors used.
Since these materials have a high index of refraction, design features of the devices such as special optical coatings and die shape are required to efficiently emit light.
By selection of different semiconductor materials, single-color LEDs can be made that emit light in a narrow band of wavelengths from near-infrared through the visible spectrum and into the ultraviolet range.
As the wavelengths become shorter, because of the larger band gap of these semiconductors, the operating voltage of the LED increases.
Blue and ultraviolet
Blue LEDs have an active region consisting of one or more InGaN quantum wells sandwiched between thicker layers of GaN, called cladding layers.
By varying the relative In/Ga fraction in the InGaN quantum wells, the light emission can in theory be varied from violet to amber.
Aluminium gallium nitride (AlGaN) of varying Al/Ga fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of InGaN/GaN blue/green devices.
If un-alloyed GaN is used in this case to form the active quantum well layers, the device emits near-ultraviolet light with a peak wavelength centred around 365 nm.
Green LEDs manufactured from the InGaN/GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems, but practical devices still exhibit efficiency too low for high-brightness applications.
Near-UV emitters at wavelengths around 360–395 nm are already cheap and often encountered, for example, as black light lamp replacements for inspection of anti-counterfeiting UV watermarks in documents and bank notes, and for UV curing.
While substantially more expensive, shorter-wavelength diodes are commercially available for wavelengths down to 240 nm.
As the photosensitivity of microorganisms approximately matches the absorption spectrum of DNA, with a peak at about 260 nm, UV LED emitting at 250–270 nm are expected in prospective disinfection and sterilization devices.
Recent research has shown that commercially available UVA LEDs (365 nm) are already effective disinfection and sterilization devices.
There are two primary ways of producing white light-emitting diodes.
One is to use individual LEDs that emit three primary colors—red, green and blue—and then mix all the colors to form white light.
The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, similar to a fluorescent lamp.
This YAG phosphor causes white LEDs to appear yellow when off, and the space between the crystals allow some blue light to pass through.
Alternatively, white LEDs may use other phosphors like manganese(IV)-doped potassium fluorosilicate (PFS) or other engineered phosphors.
PFS assists in red light generation, and is used in conjunction with conventional Ce:YAG phosphor.
In LEDs with PFS phosphor, some blue light passes through the phosphors, the Ce:YAG phosphor converts blue light to green and red light, and the PFS phosphor converts blue light to red light.
The color temperature of the LED can be controlled by changing the concentration of the phosphors.
The 'whiteness' of the light produced is engineered to suit the human eye.
Because of metamerism, it is possible to have quite different spectra that appear white.
The appearance of objects illuminated by that light may vary as the spectrum varies.
This is the issue of color rendition, quite separate from color temperature.
An orange or cyan object could appear with the wrong color and much darker as the LED or phosphor does not emit the wavelength it reflects.
The best color rendition LEDs use a mix of phosphors, resulting in less efficiency and better color rendering.
Mixing red, green, and blue sources to produce white light needs electronic circuits to control the blending of the colors.
Since LEDs have slightly different emission patterns, the color balance may change depending on the angle of view, even if the RGB sources are in a single package, so RGB diodes are seldom used to produce white lighting.
Nonetheless, this method has many applications because of the flexibility of mixing different colors, and in principle, this mechanism also has higher quantum efficiency in producing white light.
Several key factors that play among these different methods include color stability, color rendering capability, and luminous efficacy.
Often, higher efficiency means lower color rendering, presenting a trade-off between the luminous efficacy and color rendering.
For example, the dichromatic white LEDs have the best luminous efficacy (120 lm/W), but the lowest color rendering capability.
Although tetrachromatic white LEDs have excellent color rendering capability, they often have poor luminous efficacy.
Trichromatic white LEDs are in between, having both good luminous efficacy (>70 lm/W) and fair color rendering capability.
One of the challenges is the development of more efficient green LEDs.
The theoretical maximum for green LEDs is 683 lumens per watt but as of 2010 few green LEDs exceed even 100 lumens per watt.
The blue and red LEDs approach their theoretical limits.
Multicolor LEDs also offer a new means to form light of different colors.
Most perceivable colors can be formed by mixing different amounts of three primary colors.
This allows precise dynamic color control.
However, this type of LED's emission power decays exponentially with rising temperature, resulting in a substantial change in color stability.
Such problems inhibit industrial use.
Multicolor LEDs without phosphors cannot provide good color rendering because each LED is a narrowband source.
LEDs without phosphor, while a poorer solution for general lighting, are the best solution for displays, either backlight of LCD, or direct LED based pixels.
Dimming a multicolor LED source to match the characteristics of incandescent lamps is difficult because manufacturing variations, age, and temperature change the actual color value output.
To emulate the appearance of dimming incandescent lamps may require a feedback system with color sensor to actively monitor and control the color.
This method involves coating LEDs of one color (mostly blue LEDs made of InGaN) with phosphors of different colors to form white light; the resultant LEDs are called phosphor-based or phosphor-converted white LEDs (pcLEDs).
A fraction of the blue light undergoes the Stokes shift, which transforms it from shorter wavelengths to longer.
Depending on the original LED's color, various color phosphors are used.
Using several phosphor layers of distinct colors broadens the emitted spectrum, effectively raising the color rendering index (CRI).
Phosphor-based LEDs have efficiency losses due to heat loss from the Stokes shift and also other phosphor-related issues.
Their luminous efficacies compared to normal LEDs depend on the spectral distribution of the resultant light output and the original wavelength of the LED itself.
For example, the luminous efficacy of a typical YAG yellow phosphor based white LED ranges from 3 to 5 times the luminous efficacy of the original blue LED because of the human eye's greater sensitivity to yellow than to blue (as modeled in the luminosity function).
Due to the simplicity of manufacturing, the phosphor method is still the most popular method for making high-intensity white LEDs.
The design and production of a light source or light fixture using a monochrome emitter with phosphor conversion is simpler and cheaper than a complex RGB system, and the majority of high-intensity white LEDs presently on the market are manufactured using phosphor light conversion.
Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors.
As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stokes shift loss.
Losses attributable to internal optical losses due to re-absorption in the LED chip and in the LED packaging itself account typically for another 10% to 30% of efficiency loss.
Currently, in the area of phosphor LED development, much effort is being spent on optimizing these devices to higher light output and higher operation temperatures.
For instance, the efficiency can be raised by adapting better package design or by using a more suitable type of phosphor.
Conformal coating process is frequently used to address the issue of varying phosphor thickness.
Some phosphor-based white LEDs encapsulate InGaN blue LEDs inside phosphor-coated epoxy.
Alternatively, the LED might be paired with a remote phosphor, a preformed polycarbonate piece coated with the phosphor material.
Remote phosphors provide more diffuse light, which is desirable for many applications.
Remote phosphor designs are also more tolerant of variations in the LED emissions spectrum.
White LEDs can also be made by coating near-ultraviolet (NUV) LEDs with a mixture of high-efficiency europium-based phosphors that emit red and blue, plus copper and aluminium-doped zinc sulfide (ZnS:Cu, Al) that emits green.
This is a method analogous to the way fluorescent lamps work.
This method is less efficient than blue LEDs with YAG:Ce phosphor, as the Stokes shift is larger, so more energy is converted to heat, but yields light with better spectral characteristics, which render color better.
Due to the higher radiative output of the ultraviolet LEDs than of the blue ones, both methods offer comparable brightness.
A concern is that UV light may leak from a malfunctioning light source and cause harm to human eyes or skin.
Other white LEDs
Another method used to produce experimental white light LEDs used no phosphors at all and was based on homoepitaxially grown zinc selenide (ZnSe) on a ZnSe substrate that simultaneously emitted blue light from its active region and yellow light from the substrate.
A new style of wafers composed of gallium-nitride-on-silicon (GaN-on-Si) is being used to produce white LEDs using 200-mm silicon wafers.
The sapphire apparatus must be coupled with a mirror-like collector to reflect light that would otherwise be wasted.
It was predicted that since 2020, 40% of all GaN LEDs are made with GaN-on-Si.
Manufacturing large sapphire material is difficult, while large silicon material is cheaper and more abundant.
LED companies shifting from using sapphire to silicon should be a minimal investment.
Organic light-emitting diodes (OLEDs)
Main article: Organic light-emitting diode
The organic material is electrically conductive due to the delocalization of pi electrons caused by conjugation over all or part of the molecule, and the material therefore functions as an organic semiconductor.
The potential advantages of OLEDs include thin, low-cost displays with a low driving voltage, wide viewing angle, and high contrast and color gamut.
Polymer LEDs have the added benefit of printable and flexible displays.
OLEDs have been used to make visual displays for portable electronic devices such as cellphones, digital cameras, lighting and televisions.
LEDs are made in different packages for different applications.
A single or a few LED junctions may be packed in one miniature device for use as an indicator or pilot lamp.
An LED array may include controlling circuits within the same package, which may range from a simple resistor, blinking or color changing control, or an addressable controller for RGB devices.
Higher-powered white-emitting devices will be mounted on heat sinks and will be used for illumination.
Alphanumeric displays in dot matrix or bar formats are widely available.
Special packages permit connection of LEDs to optical fibers for high-speed data communication links.
Typical current ratings range from around 1 mA to above 20 mA.
Multiple LED dies attached to a flexible backing tape form an LED strip light.
Common package shapes include round, with a domed or flat top, rectangular with a flat top (as used in bar-graph displays), and triangular or square with a flat top.
The encapsulation may also be clear or tinted to improve contrast and viewing angle.
Infrared devices may have a black tint to block visible light while passing infrared radiation.
Ultra-high-output LEDs are designed for viewing in direct sunlight
5 V and 12 V LEDs are ordinary miniature LEDs that have a series resistor for direct connection to a 5 V or 12 V supply.
High-power LEDs (HP-LEDs) or high-output LEDs (HO-LEDs) can be driven at currents from hundreds of mA to more than an ampere, compared with the tens of mA for other LEDs.
Some can emit over a thousand lumens.
LED power densities up to 300 W/cm have been achieved.
Since overheating is destructive, the HP-LEDs must be mounted on a heat sink to allow for heat dissipation.
If the heat from an HP-LED is not removed, the device fails in seconds.
Some well-known HP-LEDs in this category are the Nichia 19 series, Lumileds Rebel Led, Osram Opto Semiconductors Golden Dragon, and Cree X-lamp.
As of September 2009, some HP-LEDs manufactured by Cree now exceed 105 lm/W.
Examples for Haitz's law—which predicts an exponential rise in light output and efficacy of LEDs over time—are the CREE XP-G series LED, which achieved 105 lm/W in 2009 and the Nichia 19 series with a typical efficacy of 140 lm/W, released in 2010.
LEDs developed by Seoul Semiconductor can operate on AC power without a DC converter.
For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle.
The efficacy of this type of HP-LED is typically 40 lm/W.
A large number of LED elements in series may be able to operate directly from line voltage.
In 2009, Seoul Semiconductor released a high DC voltage LED, named as 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit.
The low-power dissipation of these LEDs affords them more flexibility than the original AC LED design.
Main article: LED power sources
The current in an LED or other diodes rises exponentially with the applied voltage (see Shockley diode equation), so a small change in voltage can cause a large change in current.
Current through the LED must be regulated by an external circuit such as a constant current source to prevent damage.
Since most common power supplies are (nearly) constant-voltage sources, LED fixtures must include a power converter, or at least a current-limiting resistor.
In some applications, the internal resistance of small batteries is sufficient to keep current within the LED rating.
Main article: Electrical polarity of LEDs
Unlike a traditional incandescent lamp, an LED will light only when voltage is applied in the forward direction of the diode.
No current flows and no light is emitted if voltage is applied in the reverse direction.
If the reverse voltage exceeds the breakdown voltage, a large current flows and the LED will be damaged.
If the reverse current is sufficiently limited to avoid damage, the reverse-conducting LED is a useful noise diode.
Safety and health
Certain blue LEDs and cool-white LEDs can exceed safe limits of the so-called blue-light hazard as defined in eye safety specifications such as "ANSI/IESNA RP-27.1–05: Recommended Practice for Photobiological Safety for Lamp and Lamp Systems".
One study showed no evidence of a risk in normal use at domestic illuminance, and that caution is only needed for particular occupational situations or for specific populations.
In 2006, the International Electrotechnical Commission published IEC 62471 Photobiological safety of lamps and lamp systems, replacing the application of early laser-oriented standards for classification of LED sources.
Industry critics claim exposure levels are not high enough to have a noticeable effect.
- Efficiency: LEDs emit more lumens per watt than incandescent light bulbs. The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light bulbs or tubes.
- Color: LEDs can emit light of an intended color without using any color filters as traditional lighting methods need. This is more efficient and can lower initial costs.
- Size: LEDs can be very small (smaller than 2 mm) and are easily attached to printed circuit boards.
- Warmup time: LEDs light up very quickly. A typical red indicator LED achieves full brightness in under a microsecond. LEDs used in communications devices can have even faster response times.
- Cycling: LEDs are ideal for uses subject to frequent on-off cycling, unlike incandescent and fluorescent lamps that fail faster when cycled often, or high-intensity discharge lamps (HID lamps) that require a long time before restarting.
- Dimming: LEDs can very easily be dimmed either by pulse-width modulation or lowering the forward current. This pulse-width modulation is why LED lights, particularly headlights on cars, when viewed on camera or by some people, seem to flash or flicker. This is a type of stroboscopic effect.
- Cool light: In contrast to most light sources, LEDs radiate very little heat in the form of IR that can cause damage to sensitive objects or fabrics. Wasted energy is dispersed as heat through the base of the LED.
- Slow failure: LEDs mainly fail by dimming over time, rather than the abrupt failure of incandescent bulbs.
- Lifetime: LEDs can have a relatively long useful life. One report estimates 35,000 to 50,000 hours of useful life, though time to complete failure may be shorter or longer. Fluorescent tubes typically are rated at about 10,000 to 25,000 hours, depending partly on the conditions of use, and incandescent light bulbs at 1,000 to 2,000 hours. Several DOE demonstrations have shown that reduced maintenance costs from this extended lifetime, rather than energy savings, is the primary factor in determining the payback period for an LED product.
- Shock resistance: LEDs, being solid-state components, are difficult to damage with external shock, unlike fluorescent and incandescent bulbs, which are fragile.
- Focus: The solid package of the LED can be designed to focus its light. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a usable manner. For larger LED packages total internal reflection (TIR) lenses are often used to the same effect. However, when large quantities of light are needed many light sources are usually deployed, which are difficult to focus or collimate towards the same target.
- Temperature dependence: LED performance largely depends on the ambient temperature of the operating environment – or thermal management properties. Overdriving an LED in high ambient temperatures may result in overheating the LED package, eventually leading to device failure. An adequate heat sink is needed to maintain long life. This is especially important in automotive, medical, and military uses where devices must operate over a wide range of temperatures, and require low failure rates.
- Voltage sensitivity: LEDs must be supplied with a voltage above their threshold voltage and a current below their rating. Current and lifetime change greatly with a small change in applied voltage. They thus require a current-regulated supply (usually just a series resistor for indicator LEDs).
- Color rendition: Most cool-white LEDs have spectra that differ significantly from a black body radiator like the sun or an incandescent light. The spike at 460 nm and dip at 500 nm can make the color of objects appear differently under cool-white LED illumination than sunlight or incandescent sources, due to metamerism, red surfaces being rendered particularly poorly by typical phosphor-based cool-white LEDs. The same is true with green surfaces. The quality of color rendition of an LED is measured by the Color Rendering Index (CRI).
- Area light source: Single LEDs do not approximate a point source of light giving a spherical light distribution, but rather a lambertian distribution. So, LEDs are difficult to apply to uses needing a spherical light field; however, different fields of light can be manipulated by the application of different optics or "lenses". LEDs cannot provide divergence below a few degrees.
- Light pollution: Because white LEDs emit more short wavelength light than sources such as high-pressure sodium vapor lamps, the increased blue and green sensitivity of scotopic vision means that white LEDs used in outdoor lighting cause substantially more sky glow.
- Efficiency droop: The efficiency of LEDs decreases as the electric current increases. Heating also increases with higher currents, which compromises LED lifetime. These effects put practical limits on the current through an LED in high power applications.
- Impact on wildlife: LEDs are much more attractive to insects than sodium-vapor lights, so much so that there has been speculative concern about the possibility of disruption to food webs. LED lighting near beaches, particularly intense blue and white colors, can disorient turtle hatchlings and make them wander inland instead. The use of "Turtle-safe lighting" LEDs that emit only at narrow portions of the visible spectrum is encouraged by conservancy groups in order to reduce harm.
- Use in winter conditions: Since they do not give off much heat in comparison to incandescent lights, LED lights used for traffic control can have snow obscuring them, leading to accidents.
- Thermal runaway: Parallel strings of LEDs will not share current evenly due to the manufacturing tolerances in their forward voltage. Running two or more strings from a single current source may result in LED failure as the devices warm up. If forward voltage binning is not possible, a circuit is required to ensure even distribution of current between parallel strands.
LED uses fall into four major categories:
- Visual signals where light goes more or less directly from the source to the human eye, to convey a message or meaning
- Illumination where light is reflected from objects to give visual response of these objects
- Measuring and interacting with processes involving no human vision
- Narrow band light sensors where LEDs operate in a reverse-bias mode and respond to incident light, instead of emitting light
Indicators and signs
Main article: LED lamp
With the development of high-efficiency and high-power LEDs, it has become possible to use LEDs in lighting and illumination.
The Philips Lighting North America LED bulb won the first competition on August 3, 2011, after successfully completing 18 months of intensive field, lab, and product testing.
Efficient lighting is needed for sustainable architecture.
As of 2011, some LED bulbs provide up to 150 lm/W and even inexpensive low-end models typically exceed 50 lm/W, so that a 6-watt LED could achieve the same results as a standard 40-watt incandescent bulb.
The lower heat output of LEDs also reduces demand on air conditioning systems.
LED street lights are employed on poles and in parking garages.
In 2007, the Italian village of Torraca was the first place to convert its street lighting to LEDs.
LEDs are also being used in airport and heliport lighting.
LED airport fixtures currently include medium-intensity runway lights, runway centerline lights, taxiway centerline and edge lights, guidance signs, and obstruction lighting.
RGB LEDs raise the color gamut by as much as 45%.
Screens for TV and computer displays can be made thinner using LEDs for backlighting.
LEDs are small, durable and need little power, so they are used in handheld devices such as flashlights.
This is especially useful in cameras on mobile phones, where space is at a premium and bulky voltage-raising circuitry is undesirable.
LEDs are used in mining operations, as cap lamps to provide light for miners.
Research has been done to improve LEDs for mining, to reduce glare and to increase illumination, reducing risk of injury to the miners.
LEDs are increasingly finding uses in medical and educational applications, for example as mood enhancement.
NASA has even sponsored research for the use of LEDs to promote health for astronauts.
Data communication and other signalling
Light can be used to transmit data and analog signals.
For example, lighting white LEDs can be used in systems assisting people to navigate in closed spaces while searching necessary rooms or objects.
Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers.
Light-emitting diodes (as well as semiconductor lasers) are used to send data over many types of fiber optic cable, from digital audio over TOSLINK cables to the very high bandwidth fiber links that form the Internet backbone.
For some time, computers were commonly equipped with IrDA interfaces, which allowed them to send and receive data to nearby machines via infrared.
Because LEDs can cycle on and off millions of times per second, very high data bandwidth can be achieved.
For that reason, Visible Light Communication (VLC) has been proposed as an alternative to the increasingly competitive radio bandwidth.
By operating in the visible part of the electromagnectic spectrum, data can be transmitted without occupying the frequencies of radio communications.
The main characteristic of VLC, lies on the incapacity of light to surpass physical opaque barriers.
This characteristic can be considered a weak point of VLC, due to the susceptibility of interference from physical objects, but is also one of its many strengths: unlike radio waves, light waves are confined in the encolsed spaces they are transmitted, which enforces a physical safety barrier that requires a receptor of that signal to have physical access to the place where the transmission is occurring.
A promising application of VLC lies on the Indoor Positioning System (IPS), an analogous to the GPS built to operate in enclosed spaces where the satellite transmissions that allow the GPS operation are hard to reach.
For instance, commercial buildings, shopping malls, parking garages, as well as subways and tunnel systems are all possible applications for VLC-based indoor positioning systems.
Additionally, once the VLC lamps are able to perform lighting at the same time as data transmission, it can simply occupy the installation of traditional single-function lamps.
Other applications for VLC involve communication between appliances of a smart home or office.
With increasing IoT-capable devices, connectivity through traditional radio waves might be subjected to interference.
However, light bulbs with VLC capabilities would be able to transmit data and commands for such devices.
Machine vision systems
Main article: Machine vision
Machine vision systems often require bright and homogeneous illumination, so features of interest are easier to process.
LEDs are often used.
Barcode scanners are the most common example of machine vision applications, and many of those scanners use red LEDs instead of lasers.
Optical computer mice use LEDs as a light source for the miniature camera within the mouse.
LEDs are useful for machine vision because they provide a compact, reliable source of light.
LED lamps can be turned on and off to suit the needs of the vision system, and the shape of the beam produced can be tailored to match the system's requirements.
The discovery of radiative recombination in Aluminum Gallium Nitride (AlGaN) alloys by U.S. (ARL) led to the conceptualization of UV light emitting diodes (LEDs) to be incorporated in light induced Army Research Laboratoryfluorescence sensors used for biological agent detection.
In 2004, the Edgewood Chemical Biological Center (ECBC) initiated the effort to create a biological detector named TAC-BIO.
The program capitalized on Semiconductor UV Optical Sources (SUVOS) developed by the Defense Advanced Research Projects Agency (DARPA).
UV induced fluorescence is one of the most robust techniques used for rapid real time detection of biological aerosols.
The first UV sensors were lasers lacking in-field-use practicality.
In order to address this, DARPA incorporated SUVOS technology to create a low cost, small, lightweight, low power device.
The TAC-BIO detector's response time was one minute from when it sensed a biological agent.
It was also demonstrated that the detector could be operated unattended indoors and outdoors for weeks at a time.
Aerosolized biological particles will fluoresce and scatter light under a UV light beam.
Observed fluorescence is dependent on the applied wavelength and the biochemical fluorophores within the biological agent.
UV induced fluorescence offers a rapid, accurate, efficient and logistically practical way for biological agent detection.
This is because the use of UV fluorescence is reagent less, or a process that does not require an added chemical to produce a reaction, with no consumables, or produces no chemical byproducts.
Additionally, TAC-BIO can reliably discriminate between threat and non-threat aerosols.
It was claimed to be sensitive enough to detect low concentrations, but not so sensitive that it would cause false positives.
The particle counting algorithm used in the device converted raw data into information by counting the photon pulses per unit of time from the fluorescence and scattering detectors, and comparing the value to a set threshold.
The original TAC-BIO was introduced in 2010, while the second generation TAC-BIO GEN II, was designed in 2015 to be more cost efficient as plastic parts were used.
Its small, light-weight design allows it to be mounted to vehicles, robots, and unmanned aerial vehicles.
The second generation device could also be utilized as an environmental detector to monitor air quality in hospitals, airplanes, or even in households to detect fungus and mold.
This includes remote controls, such as for television sets, where infrared LEDs are often used.
This is especially useful in medical equipment where the signals from a low-voltage sensor circuit (usually battery-powered) in contact with a living organism must be electrically isolated from any possible electrical failure in a recording or monitoring device operating at potentially dangerous voltages.
An optoisolator also lets information be transferred between circuits that do not share a common ground potential.
Many sensor systems rely on light as the signal source.
LEDs are often ideal as a light source due to the requirements of the sensors.
The Nintendo Wii's sensor bar uses infrared LEDs.
Some flatbed scanners use arrays of RGB LEDs rather than the typical cold-cathode fluorescent lamp as the light source.
Having independent control of three illuminated colors allows the scanner to calibrate itself for more accurate color balance, and there is no need for warm-up.
Further, its sensors only need be monochromatic, since at any one time the page being scanned is only lit by one color of light.
Since LEDs can also be used as photodiodes, they can be used for both photo emission and detection.
Many materials and biological systems are sensitive to, or dependent on, light.
Deep UV LEDs, with a spectra range 247 nm to 386 nm, have other applications, such as water/air purification, surface disinfection, epoxy curing, free-space nonline-of-sight communication, high performance liquid chromatography, UV curing and printing, phototherapy, medical/ analytical instrumentation, and DNA absorption.
LEDs have also been used as a medium-quality voltage reference in electronic circuits.
The forward voltage drop (about 1.7 V for a red LED or 1.2V for an infrared) can be used instead of a Zener diode in low-voltage regulators.
Red LEDs have the flattest I/V curve above the knee.
Nitride-based LEDs have a fairly steep I/V curve and are useless for this purpose.
Although LED forward voltage is far more current-dependent than a Zener diode, Zener diodes with breakdown voltages below 3 V are not widely available.
The progressive miniaturization of low-voltage lighting technology, such as LEDs and OLEDs, suitable to incorporate into low-thickness materials has fostered experimentation in combining light sources and wall covering surfaces for interior walls in the form of LED wallpaper.
Research and development
LEDs require optimized efficiency to hinge on ongoing improvements such as phosphor materials and quantum dots.
The process of down-conversion (the method by which materials convert more-energetic photons to different, less energetic colors) also needs improvement.
For example, the red phosphors that are used today are thermally sensitive and need to be improved in that aspect so that they do not color shift and experience efficiency drop-off with temperature.
Red phosphors could also benefit from a narrower spectral width to emit more lumens and becoming more efficient at converting photons.
In addition, work remains to be done in the realms of current efficiency droop, color shift, system reliability, light distribution, dimming, thermal management, and power supply performance.
Perovskite LEDs (PLEDs)
A new family of LEDs are based on the semiconductors called perovskites.
In 2018, less than four years after their discovery, the ability of perovskite LEDs (PLEDs) to produce light from electrons already rivaled those of the best performing OLEDs.
They have a potential for cost-effectiveness as they can be processed from solution, a low-cost and low-tech method, which might allow perovskite-based devices that have large areas to be made with extremely low cost.
Their efficiency is superior by eliminating non-radiative losses, in other words, elimination of recombination pathways that do not produce photons; or by solving outcoupling problem (prevalent for thin-film LEDs) or balancing charge carrier injection to increase the EQE (external quantum efficiency).
The most up-to-date PLED devices have broken the performance barrier by shooting the EQE above 20%.
In 2018, Cao et al.
and Lin et al.
independently published two papers on developing perovskite LEDs with EQE greater than 20%, which made these two papers a mile-stone in PLED development.
Their device have similar planar structure, i.e. the active layer (perovskite) is sandwiched between two electrodes.
To achieve a high EQE, they not only reduced non-radiative recombination, but also utilized their own, subtly different methods to improve the EQE.
In the work of Cao et al.
, researchers targeted the outcoupling problem, which is that the optical physics of thin-film LEDs causes the majority of light generated by the semiconductor to be trapped in the device.
To achieve this goal, they demonstrated that solution-processed perovskites can spontaneously form submicrometre-scale crystal platelets, which can efficiently extract light from the device.
In addition, their method is able to passivate perovskite surface defects and reduce nonradiative recombination.
Therefore, by improving the light outcoupling and reducing nonradiative losses, Cao and his colleagues successfully achieved PLED with EQE up to 20.7%.
In Lin and his colleague's work, however, they used a different approach to generate high EQE.
Instead of modifying the microstructure of perovskite layer, they chose to adopt a new strategy for managing the compositional distribution in the device——an approach that simultaneously provides high luminescence and balanced charge injection.
In other words, they still used flat emissive layer, but tried to optimize the balance of electrons and holes injected into the perovskite, so as to make the most efficient use of the charge carriers.
Moreover, in the perovskite layer, the crystals are perfectly enclosed by MABr additive (where MA is CH3NH3).
The MABr shell passivates the nonradiative defects that would otherwise be present perovskite crystals, resulting in reduction of the nonradiative recombination.
Therefore, by balancing charge injection and decreasing nonradiative losses, Lin and his colleagues developed PLED with EQE up to 20.3%.
Devices called "nanorods" are a form of LEDs that can also detect and absorb light.
They consist of a quantum dot directly contacting two semiconductor materials (instead of just one as in a traditional LED).
One semiconductor allows movement of positive charge and one allows movement of negative charge.
They can emit light, sense light, and collect energy.
The nanorod gathers electrons while the quantum dot shell gathers positive charges so the dot emits light.
When the voltage is switched the opposite process occurs and the dot absorbs light.
By 2017 the only color developed was red.
Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Light-emitting diode.