Led Diode Pn Junction

- November 09, 2018

The pn junction diode is the basic semiconductor diode format. It is used for many forms of rectification for current levels both large and small as well as high and low voltage levels and it finds many uses in all manner of electronic circuits.

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In 1962 nick holonyak has come up with an idea of light emitting diode and he was working for the general electric company.

Led diode pn junction. Leds are semiconductor diodes electronic devices that permit current to flow in only one direction. Led pn junction diode. The led is a special type of diode and they have similar electrical characteristics of a pn junction diode.

A p n junction diode is two terminal or two electrode semiconductor device which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction. So lets talk about p n junction. The diode is formed by bringing two slightly different materials together to form a pn junction figure 2.

What is p n junction semiconductor diode. Light emitting diode structure. What is an led.

In led all energy converted into a light. In pn junction diode all energy converted into a heat. You can think about the p n junction being formed in three separate stages.

Hence the led allows the flow of current in the forward direction and blocks the current in the reverse direction. The led uses gaas gaasp or gap material. Id like to tell you how a light emitting diode works.

In a pn junction the p side contains excess positive charge holes indicating the absence of electrons while the n side contains excess negative charge electrons. The pn junction diode silicon or germanium material. The led emits light.

If the diode is forward biased it allows the electric current flow. Pn junction diode plays a vital role in our electronic fields because of their unique property current flows in only one direction they are used in many electronic or electrical circuits like rectifiers switches clippers clampers voltage multipliers. In this article we will learn about what is a pn junction diode and how it works and also effect on pn junction diode with different.

Leds are p n junction devices constructed of gallium arsenide gaas gallium arsenide phosphide gaasp or gallium phosphide gap. The pn junction diode cannot emit light. Silicon and germanium are not suitable because those junctions produce heat and no appreciable ir or visible light.

Its based on a p n junction in which electrons and holes recombine and emit light. Its on state voltage ranges between 12 v to 20 v.