Light-emitting diode, Other Engineering

Light-emitting diode:

One of the most common light sources used in electronics is the "Light Emitting Diode" (LED).  A LED is a two terminal semiconductor device comprising a p-n junction, which conducts in one direction only.  This semiconductor material emits light when the p-n junction is forward biased and a current is flowing through it.  LEDs can be manufactured to emit visible or invisible (infra-red) light.

Visible LEDs are often used as indicators in electronic equipment either singly, for indicating 'power on' for instance, or in arrays for alpha/numeric displays.

LEDs are reliable and have a very long life if treated carefully.  Light emission in different colours of the spectrum can, when required, be obtained by varying the proportions of the elements comprising the chip, and also by a technique of "doping" with other elements, i.e. nitrogen.  Current consumption (typically about 5 - 20 mA) generally limits the usefulness of a LED to equipment that is not battery powered.

2032_light emmiting diode.png

Posted Date: 9/13/2012 8:21:32 AM | Location : United States

Related Discussions:- Light-emitting diode, Assignment Help, Ask Question on Light-emitting diode, Get Answer, Expert's Help, Light-emitting diode Discussions

Write discussion on Light-emitting diode
Your posts are moderated
Related Questions

Q. Explain the grain growth. Ans. Grain growth: After Recrystallization is complete, the strain free grains will continue to grow if the metal specimen is left at elevated te

obtain the polyphase structure H(Z)=1-3Z^-1/1+4Z^-1

#i need help with plumbing/ engineering assignments, from an expert with australian codes, there is any chance,thank you .

the requirements are 1- prescriptive analysis of occupancy through prescriptive code analysis with in- depth information related to the egress.2- fire scenario design realistic and

Calculate the maximum range when radar operates at 10GHz and has peak power=10 Mwatt,S/N ratio=10dB,antenna cross section=100 mm2,target cross section=10mm2.The gain of transmittin

Gravity Die Casting  In PERMANENT MOULD CASTING, molten metal is poured under gravity into a metal mould where it remains until it solidifies. The mould is then opened and the

explain any two finishing processes in detail with neat diagram

List three advantages and three disadvantages of open office spaces.