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Technology Stocks : White light from LED
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To: semi_infinite who wrote (186)2/25/2000 5:08:00 PM
From: John Finley   of 565
 
SiC biggest advantage is form factor and not brightness

Sounds reasonable to me. From what I understand SiC or sapphire is just the substrate for the junction materials (doped GaN). SiC is nice because it can be "super" doped into a conductor so that one electrical connection is on the backside away from the light-emitting part (form factor). SiC also has really good thermal conductivity although I don't know if heat is a problem. I'm not sure how the brightness varies with lattice mismatch so I don't know how people are tweaking brightness, but I would guess it's in the junction (GaN) part. BTW, I don't believe SiC is less expensive than sapphire. Last sapphire I bought was <$100 2" wafer.

As an aside, anyone with an interest in "white LED" plays ought to check out:
This agreement will bring to SLI (formerly Chicago Miniature Lamp) the same depth of LED technology, including "white LEDs", as any of the large industry players. SLI, Inc. is now uniquely positioned in the marketplace, with its global infrastructure of value added miniature lighting manufacturing operations to serve the needs of the major OEMs with full service design and production of the complete lighting system.
sli-lighting.com
sli-lighting.com

BTW, SLI has a PE ~11

JF
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