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To: unclewest who wrote (14676)	1/9/2000 8:37:00 AM
From: RocketMan	Read Replies (2) \| Respond to of 54805

Thanks, unclewest. This thread is a great place to obtain and share information. The traffic lights here using SiC LEDs...are using them initially for red. This is what I didn't understand. I assume that SiC, when stimulated, emits in specific spectral bands, and I supposed it was blue/green from all of the literature I read. So how do they get red? I found the following in one of the links provided in the cree thread: Cree manufactures LED die packets which are shipped to customers who then package the dies into a finished LED. Cree's LEDS are manufactured in a process called epitaxy. This is a process where the SiC wafers have a Gallium Nitride (GaN) layer deposited on the surface of the SiC. The GaN is the material that emits the blue or green light. The white LEDS are actually "blue LEDS with a phosphor coating that emits white light when energized by the blue light from the LED. So apprently the way it works is that the GaN layer is what actually emits the blue/green. A phosphor on top of that essentially frequency shifts to white. Once you have white, I guess you can get any color. This helps me understand what's going on. Comment if you wish. Also, you say LEDs are 50% of cree's revs. That other link says 80%, don't know which is right but in either case it is a majority of their revenues, and I suppose at this time this is the major SiC application. I mean, high tech application, SiC is also used as an abrasive and ceramic construction material. Thanks again.