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LED Colors


It is also possible to produce other colors using the same basic GaN technology and growth processes. For example, a high brightness green (approximately 500nm) LED has been developed that has replaced the green bulb in traffic lights. Other colors including purple and white are also possible. With the introduction of blue LEDs, it is possible to produce white by selectively combining the proper combination of red, green and blue light. This process however, requires sophisticated software and hardware design to implement. In addition, the brightness level is low and the overall light output of each RGB die being used degrades at a different rate resulting in an eventual color unbalance. Another approach taken to achieve white light output, is to use a phosphor layer (Yttrium Aluminum Garnet) on the surface of a blue LED.

In summary, LEDs have gone from infancy to adolescence and are experiencing some of the most rapid market growth of their lifetime. By using InGaAlP material with MOCVD as the growth process, combined with efficient delivery of generated light and efficient use of injected current, some of the brightest, most efficient and most reliable LEDs are now available. This technology together with other novel LED structures will ensure wide application of LEDs. New developments in the blue spectrum and on white light output will also guarantee the continued increase in applications of these economical light sources.

Color

Wavelength [nm]

Voltage drop [ΔV]

Semiconductor material

Infrared

λ > 760

ΔV < 1.63

Gallium arsenide (GaAs)
Aluminium gallium arsenide (AlGaAs)

Red

610 < λ < 760

1.63 < ΔV < 2.03

Aluminium gallium arsenide (AlGaAs)
Gallium arsenide phosphide (GaAsP)
Aluminium gallium indium phosphide (AlGaInP)
Gallium(III) phosphide (GaP)

Orange

590 < λ < 610

2.03 < ΔV < 2.10

Gallium arsenide phosphide (GaAsP)
Aluminium gallium indium phosphide (AlGaInP)
Gallium(III) phosphide (GaP)

Yellow

570 < λ < 590

2.10 < ΔV < 2.18

Gallium arsenide phosphide (GaAsP)
Aluminium gallium indium phosphide (AlGaInP)
Gallium(III) phosphide (GaP)

Green

500 < λ < 570

1.9 < ΔV < 4.0

Traditional green:
Gallium(III) phosphide (GaP)
Aluminium gallium indium phosphide (AlGaInP)
Aluminium gallium phosphide (AlGaP)
Pure green:
Indium gallium nitride (InGaN) / Gallium(III) nitride (GaN)

Blue

450 < λ < 500

2.48 < ΔV < 3.7

Zinc selenide (ZnSe)
Indium gallium nitride (InGaN)
Silicon carbide (SiC) as substrate
Silicon (Si) as substrate—under development

Violet

400 < λ < 450

2.76 < ΔV < 4.0

Indium gallium nitride (InGaN)

Purple

Multiple types

2.48 < ΔV < 3.7

Dual blue/red LEDs,
blue with red phosphor,
or white with purple plastic

Ultraviolet

λ < 400

3.1 < ΔV < 4.4

Diamond (235 nm)
Boron nitride (215 nm)
Aluminium nitride (AlN) (210 nm
Aluminium gallium nitride (AlGaN)
Aluminium gallium indium nitride (AlGaInN)—down to 210 nm

Pink

Multiple types

ΔV ~ 3.3

Blue with one or two phosphor layers:
yellow with red, orange or pink phosphor added afterwards,
or white phosphors with pink pigment or dye over top

White

Broad spectrum

ΔV = 3.5

Blue/UV diode with yellow phosphor

 


 

 

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