What Is Light Emitting Diode (LED) ? Its Characteristics,Working, Advantages & Disadvantages

LED or Light Emitting Diode is a PN junction diode, which is specially doped and made of special type of semiconductor, emits light when it is forward biased is called light emitting diode. In other words, a light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons.

Also Read: Zener Diode, Its Working, Zener Breakdown And Its Applications

LED Characteristics-

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The forward bias Voltage-Current (V-I) curve and the output characteristics curve are shown in the figure above. The V-I curve is practically applicable to burglar alarms. The forward bias of approximately 1 volt is needed to give significant forward current. The second figure is used to represent a radiant power-forward current curve. The output power produced is very small and thus the efficiency in electrical-to-radiant energy conversion is very less.

Also Read: Zener Diode, Its Working, Zener Breakdown And Its Applications

The commercially used LED‘s have a typical voltage drop of 1.5 Volt to 2.5 Volt or current between 10 to 50 milliamperes. The exact voltage drop depends on the LED current, colour, tolerance, and so on.

LED Working-

One Response

  1. Sriram.M March 24, 2018

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