Arizona State claims 100% efficient OLED

[justDIY]

A recent cover story in the journal Advanced Materials, a leading materials and device engineering research publication, details advances in the use of organic light-emitting diodes (OLEDs) by Ghassan Jabbour and Jian Li, with help from graduate students Evan Williams and Kirsi Haavisto, a Fulbright scholar from Finland. ... The two have developed an organic lighting device with “100 percent internal quantum efficiency” by employing newly designed host materials coupled with optimized device architecture.

http://www.asu.edu/news/stories/200704/20070412_lighting.htm

[BVnursery]

That good we can only hope they head into production in the next 30 days.

[justDIY]

i'm sure the diode is probably only a few molecules in size or something else, and won't be commercially viable for a LONG time, if ever.  If its 100% efficient, that means it only needs 1/4 or less the power of a current led, to produce the same amount of light?  I wonder how they overcome the efficiency losses of photons bumping into each other and into the silicon matrix (or whatever the organic equivalent is)  on their way out of the junction?

[cadstarsucks]

i'm sure the diode is probably only a few molecules in size or something else, and won't be commercially viable for a LONG time, if ever.  If its 100% efficient, that means it only needs 1/4 or less the power of a current led, to produce the same amount of light?  I wonder how they overcome the efficiency losses of photons bumping into each other and into the silicon matrix (or whatever the organic equivalent is)  on their way out of the junction?

I think that is what they mean by "internal".  They can calculate how much is lost to that stuff and add it back in to get their "efficiency".  It looks great on paper but does nothing for anyone in the real world.

Dan

[kinnza]

There was LEDs with internal efficiencies over 90% long ago. The main problem with LEDs is its low external efficiency due to chip reabsorbing a large percentage of generated photons. But maybe this problem is easier to solve with OLEDs. I wait for deeper info on this subject, but anyway is a nice improvement, though.

It would be nice this new improvement jumping on to production soon.