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light-emitting diode

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Light-emitting Diode


Electronic component that converts electrical energy into light or infrared radiation in the range of 550 nm (green light) to 1,300 nm (infrared). They are used for displaying symbols in electronic instruments and devices. An LED is a diode made of semiconductor material, such as gallium arsenide phosphide, that glows when electricity is passed through it. The first digital watches and calculators had LED displays, but many later models use liquid-crystal displays.

In 1993 chemists at the University of Cambridge, England, developed LEDs from the polymer poly(p-phenylenevinyl) (PPV) that emit as much light as conventional LEDs and in a variety of colours.

A new generation of LEDs that can produce light in the mid-infrared range (300–1,000 nm) safely and cheaply were developed by British researchers in 1995, using thin alternating layers of indium arsenide and indium arsenide antimonide.

© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.


 
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alternating current
ammeter
ampere
amplifier
battery
capacitor
cell, electrical
circuit (physics)
diode
direct current
electric current
electronics
farad
generator
integrated circuit
lamp, electric
LCD
light-dependent resistor
light-emitting diode
liquid-crystal display
logic gate
ohm
Ohm's law
operational amplifier
parallel circuit
printed circuit board
rectifier
relay
resistance
resistor
semiconductor
series circuit
switch
thermistor
thyristor
timer circuit
transistor
volt
voltmeter
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