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Technology Stocks : Wolf speed
WOLF 20.32-0.9%Nov 28 12:59 PM EST
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To: unclewest who wrote (1768)2/3/2000 6:48:00 PM
From: mauser96  Read Replies (2) of 10713
 
Why are blue LED are important in getting the most often desired end product of a "white" light? There are 2 possible answers, though so far I can't find much published on the subject.
1) Blue LED can be used in combination with other color LED to produce white light
2) Blue LED can be used to stimulate a phosphor which in turn produces white light. This is somewhat similar to the process used inside a fluorescent light bulb .. The blue color is important because Planck discovered that the energy of a light quantum increases with frequency, and blue is higher frequency than red. (Higher frequency means shorter wavelength). Thus a blue LED should be more efficient at stimulating phosphors to produce white light than would be a red or other color LED. This probably is how the white colored LED flashlights work, because examining them with a magnifier indicates presence of a white colored shield not present in the blue color LED flashlight.
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