Different coloured Light Emitting Diodes (LEDs)

Different coloured Light Emitting Diodes (LEDs)

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This image is part of the feature Race for Rare Earth Metals
This image is part of the feature Lighting The Way To A Brighter Future

Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Blue diode. View of a hand holding the worlds first marketed blue light emitting diode (LED) made from gallium nitride. It is shown with different coloured LEDs. The only blue LEDs available before this were based on silicon carbide. These were very inefficient and did not glow very brightly. LEDs are made of two thin film layers that contain specific impurities which give them opposite electrical properties. An electric current passing through the LED will make it produce light. LEDs were developed in the 1960s but could initially only produce red or green light. In 1995 the Nichia corporation of Japan first marketed these blue LEDs.

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Keywords: assortment, blue, blue led, device, diode, electronic, electronics, first ever, galliium nitride, gallium nitride, gallium nitride led, hand holding, led, light emitting diode, nichia, technology equipment

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