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Article #5129Re: Blue and UltraViolet LED's
From: John Whitmore
Date: Wed, 18 Jul 1990 01:08
Date: Wed, 18 Jul 1990 01:08
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In article <38692@cci632.UUCP> rdi@ccird3.UUCP (Rick Inzero) writes: > >...just what's so technologically difficult here, regarding UV LEDs? >Sure, the currently used plastic housings won't pass shorter >wavelengths of UV, but so what? Wouldn't a silica glass housing work just >fine, in fact, even passing short wavelengths of UV? The light emission occurs preferentially at the bandgap energy of a semiconductor. GaAs gives infrared; Ga, Al, and In in some proportion with As, P give various shades up to green. To get blue, SiC is used (that's silicon carbide, like the grit in sandpaper). For UV, you'd need to develop yet another (new) semiconductor. Maybe doped diamond? The bandgap is about right for UV... John Whitmore
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!dali.cs.montana.edu!milton!whit From: whit@milton.u.washington.edu (John Whitmore) Newsgroups: sci.electronics Subject: Re: Blue and UltraViolet LED's Summary: Different colors are due to different semiconductors Message-ID: <5206@milton.u.washington.edu> Date: 18 Jul 90 01:08:28 GMT References: <1990Jul11.233848.29098@zoo.toronto.edu> <1551@oucsace.cs.OHIOU.EDU> <38692@cci632.UUCP> Distribution: na Organization: University of Washington, Seattle Lines: 16