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How white led work

Contents:Product InfoStars:3 StarsPopularity:-Time:2009-12-24 22:00:00

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Now led light can have different colors such as yellow,white,blue,red,green,pink,amber, and so on.But do you know how white led work?

 

The 'white' of white LEDs comes from the narrow-band blue naturally emitted by GaN LEDs, plus a broad spectrum yellow generated by a phosphor coating on the die which absorbs a proportion of the blue and converts it to yellow.

 

'GaN' die are actually InGaN heterostructures, which can produce operational wavelengths from green to ultra-violet by varying the relative amounts of indium and gallium during production.

 

Although this blue die + yellow phosphor approach yields light which appears white, it has little green and almost no red content leading to inferior colour rendering compared with incandescent bulbs and even 'tri-phosphor' florescent tubes. 'Warm white' LEDs, which include a red-producing phosphor, are an attempt to improve this situation as well as make LEDs illumination more acceptable in living spaces.
 

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