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

To: John Finley who wrote (467)	2/7/2002 8:33:53 PM
From: sirdar	Respond to of 565

white light.... cree announced new higher brightness leds today also. this stuff is only beginning. best wishes, sardar

To: John Finley who wrote (467)	2/7/2002 9:07:37 PM
From: kinkblot	Read Replies (1) \| Respond to of 565

Thanks. I get PT, but missed that article. Must've been too busy Christmas shopping. <g> Nichia says: First samples for the new white LED will be available for Nichia's NSCW215 series, a side view surface-mount LED. The improved NSCW215 emits 600 mcd of light and is only 1.0 millimeter in height. An even thinner side view surface-mount LED, with a height of a mere 0.8 millimeters and a full 600 mcd, will also be available. With no increase in power consumption, the higher brightness and lower profile of both parts make them ideal for backlighting color LCD displays in mobile devices. ... The unimproved NSCW215 emits 430 mcd at something like 72 mW power consumption if I'm reading the specs correctly. I'll approximate the radiation pattern as a uniform, conical beam of half angle 56° (directivity is specified as 110/115°). Then 1 candela would give (.44)(2pi) lumens, so NSCW215 has an efficacy of about 1.19&nbsplm / .072&nbspW = 17&nbsplm/W and will have about 23&nbsplm/W with the improvements. Just checking to see how these things match up with Physic Today's Figure 1. The OLEDs are improving at a rapid clip! Can they keep it up? WT