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Technology Stocks : Wolf speed
WOLF 22.04+8.5%3:59 PM EST
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To: mauser96 who wrote (1772)2/4/2000 2:35:00 AM
From: FLSTF97  Read Replies (1) of 10713
 
Thus a blue LED should be more efficient at stimulating phosphors to produce white light than would be a red or other color LED.

Lucius your message is more or less correct but the statement above is not. You need to stimulate phosphors with higher energy radiation to have them emit the lower energy light. Blue is critical because it is at the high energy end of the visible light spectrum. If you have only blue light, you can then have various phosphors emit the other colors needed to produce white light (the combination of all visible colors but approximated by adding the primary colors).

If you only have red light you will never be able to get white light from a phosphor. It is not an efficiency issue.

I hope that helps clarify the importance of blue leds in achieving white light.

FATBOY
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