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What is a Light Emitting Diode (LED)?

What is a Light Emitting Diode (LED)?

Times:2010-6-24 Clik:920 Size:S M L Back

Swallow 2010-6-24

---- What is a Light Emitting Diode (LED)?

The light from an LED comes from a semiconductor crystal.

There are two parts to the crystal, one with a surplus of electrons and the other with a deficiency of electrons.

When a current is applied, electrons pass through a transitional layer to the deficient side, releasing energy in the form of photons of light.

 

---- When were LED’s invented?

The LED was first invented in Russia in the 1920’s, when it was noticed that a standard current-blocking diode in a radio receiver glowed a faint red when operating.

The first practical LED was invented in 1962 by Nick Holonyak, Jr. while working for General Electric Company.

Since then, the efficiency and light output of LED’s have doubled roughly every 18 to 24 months, to become Haitz’s Law.

 

---- When were White LED’s first available?

White LED’s became a reality around 1995 thanks to Japan’s Nichia Corporation.

What we commonly see as white LED illumination is actually a blue LED chip coated with a special phosphor to produce white light when a current is applied.

Alternatively, some manufacturers use three individual LED’s of the three primary colors and mix them to produce white.

 

FriendLED company always use first class brand of LED, like CREE, Nichia, Bridgelux, Citizen, and so on. We treat top quality as our first vitality!

 
 
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