For you Physicists - Efficiency of Q-DOT LEDs?

[toos]

I keep seeing articles in various engineering and science journals on Sandia and Los Alamos Labs Quantum Dot solid state light device research. I can see how Q-dots might eliminate the need for binning of white light Q-dot devices (consistent color and intensity based on Q-dot tuning and homogeneity of Q-dot "mixture"), but I have not seen an estimate of overall efficiency for an electrically driven quantum well-> Q-Dot emitter. Can someone provide an efficiency comparison of current high efficiency white LEDs vs. what they think a device of the type described below might attain? What are the limitations of such a device if it was used in an EDC? Any idea of the life expectancy of such a device? The RPI paper on LED life expectancy for conventional white light LED design is quite interesting. Would tuning of the Q-Dots and the close coupling of Q-Dot to driver eliminate some of the degradation problems of conventional white light LEDs noted in that paper?

Wish I understood the physics behind all this, but it is intriguing stuff nonetheless.

http://www.lanl.gov/worldview/news/releases/archive/04-053.shtml

http://www.sandia.gov/news-center/news-releases/2003/elect-semi-sensors/quantum.html

 

[PhotonBoy]

Good question and I have no idea. Maybe the experts don't either - yet. Intuitively, though, I expect that the Q-Dots won't degrade over time at the same rate as the yellow phosphors used for white LEDs. I think that the yellow phosphor chemically decomposes under high heat levels. JMHO.

 

[NikolaTesla]

Looks like we are on edge of entirely new lighting physics.

I thought I was up on quantum theory but need to keep up with this stuff.

More goodbye's to the hot wire lights soon to follow...
/ubbthreads/images/graemlins/sssh.gif
Hey I don't have any 78 RPM records or tube type equipment either ( I don't like linear audio amps at all- digital switching processor controlled are FAR superior) Can't wait to see whats next when this technology gets out of lab and into production.. /ubbthreads/images/graemlins/icon6.gif /ubbthreads/images/graemlins/confused.gif


NikolaTesla /ubbthreads/images/graemlins/smile.gif

An Arc lamp is the Spark that takes away the Dark--HID Forever!

My Lights LightWar /ubbthreads/images/graemlins/xyxgun.gif