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To: unclewest who wrote (43)	12/4/1999 2:43:00 PM
From: Will Lyons	Read Replies (1) \| Respond to of 330

Way back I saw a note that the brightness of SiC LEDs did not equal that of some of the Gallium compounds. Also remember that GE has a thing going with EMKR using Gallium rather than SiC and that UTCI is also involved . My question is -- is there a clear advantage to either approach based on cost or other considerations or should we hedge our bets in this high stakes game?

To: unclewest who wrote (43)	12/4/1999 6:23:00 PM
From: John Finley	Read Replies (1) \| Respond to of 330

>>i believe that[Pru target change] is what moved cree not the gntx announcement.<< Yes, I agree. After some questionaires I got ahold of the Pru report. Very informative. There are some materials issues I need to do some homework on. It is my understanding that SiC and sapphire are just the substrates that they grow GaN diodes on. SiC is the best because it's crystal lattice is the closest match to GaN (same with thermal expansion). I need to find a data sheet on SiC for thermal and electrical conduction among other things. Maybe at the Cree website. <edit> Hot dog! Their site is chock full of goodies! <edit> Thanks for pointing out the Pru report. JF