udaman
Wannabe Storage Freak
- Joined
- Sep 20, 2006
- Messages
- 1,209
So I was reading the article on 'droop':
http://spectrum.ieee.org/semiconductors/optoelectronics/the-leds-dark-secret/0
Then I was reading the author's comments to jtr
http://www.compoundsemiconductor.net/csc/news-details.php?cat=news&id=37614
^About Nichia's lab LED's...which were discussed last year @this time @Photonics West.
http://spie.org/app/program/index.cfm?fuseaction=exhibitors&group=7
^I see from the vendor list that Cree doesn't have a presence, but Nichia is there again this weekend. So can we expect some more 'top secret' news in the next week or so?
If new phosphor technology can change the limits, then what does that say for what the 'theoretical' limits are??? And how did jtr come up; with his red/green/blue white LED that has a limit of 400lm/w @100% conversion efficiency? Can't we use near absolute zero science to obtain new physics and get >400lm/w @>350ma current...with CRI >95 ?
http://spectrum.ieee.org/semiconductors/optoelectronics/the-leds-dark-secret/0
Then I was reading the author's comments to jtr
http://www.compoundsemiconductor.net/csc/news-details.php?cat=news&id=37614
^About Nichia's lab LED's...which were discussed last year @this time @Photonics West.
http://spie.org/app/program/index.cfm?fuseaction=exhibitors&group=7
^I see from the vendor list that Cree doesn't have a presence, but Nichia is there again this weekend. So can we expect some more 'top secret' news in the next week or so?
^300lm/w @20ma...yawn. I want to see 300lm/w @>350maMukai initially introduced the result by stating that the theoretical efficacy limit for white LEDs is 263 lm/W. Yet, when questioned by the audience he explained that Nichia has pushed this ceiling to over 300 lm/W thanks to the introduction of a new phosphor technology...One member of the audience asked if Nichia had managed to push the wavelength of its lasers beyond 488 nm, only to be met by the terse reply “top secret”.
If new phosphor technology can change the limits, then what does that say for what the 'theoretical' limits are??? And how did jtr come up; with his red/green/blue white LED that has a limit of 400lm/w @100% conversion efficiency? Can't we use near absolute zero science to obtain new physics and get >400lm/w @>350ma current...with CRI >95 ?