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Politics : Formerly About Applied Materials -- Ignore unavailable to you. Want to Upgrade?

To: Sam Citron who wrote (57352)	12/13/2001 3:44:45 PM
From: Katherine Derbyshire	Read Replies (1) \| Respond to of 70976

Why is this breakthrough so important for illumination? If you have a bright white LED, can't you simply tint the coating any color you want? Is there any way to tune your choice of colors from an in situ LED array? If you have a bright white LED, then yes you can use any coating you want. The bright white LED itself is the breakthrough. It's now possible to get pretty much any LED base color you want by tuning the composition of the material. (Composition=band gap=emission color) For displays, I think most designs use a three LED array (red, green, and blue) per pixel, and light up the appropriate ones to get the desired final color. It would also be possible to use three white LEDs with red, green, and blue color filters, but I think the colored LEDs are slightly more mature than white right now. Which means they have better yield and more predictable spectral characteristics. Nichia is a Japanese chemical company. I don't know whether they're traded in the US or not. Sorry, I don't follow the LED market closely enough to have any guesses about market size, segmentation, or anything like that. If I were looking for it, I'd probably start with Cree's web page. Katherine