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Technology Stocks : White light from LED -- Ignore unavailable to you. Want to Upgrade?

To: John Finley who wrote (481)	3/24/2002 1:44:44 PM
From: John Finley	Read Replies (1) \| Respond to of 565

I see that Cree is getting tax dollars to look into UV LEDs and lasers. biz.yahoo.com Says 280-340 nanometers. I was trying to find the band gaps of these semiconductors and found this site: ioffe.ru For GaN the band gap is ~3.4eV or 365nm assuming a direct "jump" (which probably isn't the case but should give a "best" range). For SiC the gap is 2.4eV (I think?) or 517nm. The Nichia lasers are ~405nm. So what will Cree be looking at? I see that AlN has a band gap of 4.9eV or 253nm and diamond ~5.5eV, 225nm. I don't know if these are candidates or not, my knowledge of semiconductor physics is very basic and dusty at this point <g>. JF