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What is an LED?

What is an LED?

What is an LED?

An LED (Light-Emitting Diode) is a semiconducting light source. LEDs work on the principle of Electroluminescence – the passage of electrical current to cause an optical effect. The flow of current from positive to negative, passes through a semiconducting material which causes the electrons and electron holes to pass through one another. This in turn causes the electron to release the energy in the form of a photon.

 

LED Light emitting diode how does it work

Close up of an LED – Note the light coming from the semi conductor.

 

 

 

Why do LEDs last so long?
Led’s typically have a lifespan lasting roughly 20,000 – 30,000 hours on average, which is a very long time. (Fun Fact: If an LED bulb is used 10 hours everyday, then theoretically it could last 8 years!) This is because, unlike incandescent bulbs, LEDs do not radiate a large amount of heat. LEDs in hot climates may not operate to such a long lifespan, due to the slow degradation of the semiconductor, similar to that of a filament weakening till it eventually snaps, breaking the circuit.

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What is an LED?
LED Light emitting diode how does it work