LED die grown on diamond

NewBie

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Group4 Labs Develops GaN-on-Diamond Substrate (LED grown on Diamond)



February 14, 2006...Group4 Labs, LLC ..., has developed a gallium nitride (GaN)-on-diamond semiconductor wafer for high power,..., solid state white lighting, military, and photonics applications. ....
http://www.solidstatelighting.net/lightimes/

February 14, 2006 - Menlo Park, CA - Group4 Labs, LLC,
The new wafer offers a unique solution by extricating heat from the chip's core almost at the instant that it is generated. ... CVD diamond's thermal conductivity is about 3X to 30X more than that of conventional semiconductors.
http://www.group4labs.com/newsroom/pressreleases/021406.html
 

carrot

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Sounds awesome. I wonder when they will hit the market, and if they'll be at a viable price point for flashlights.
 

jsr

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Sounds like SoI (Silicon on Insulator) technology used on other semicon products is being used for LEDs now. They should be able to grow the Si on other insulator materials also for a lower priced end product.
 

Melchior

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I think the idea was to allow greater power to flow thru the LED, and thus have a greater need for thermal control.

So I guess you could take a regular 3w LED and get +4w or more out of it without cooking it.

Synthetic diamond should be cheaper now, but its still pretty HARD to make. (heh heh)
 

IsaacHayes

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I'll take one of these in a luxeon package with a Cyan 488nm chip on it, capable of running 15watts through it please!!! I don't need no white led, the phosphur would just burn up! :D
 

IMSabbel

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Diamond is REALLY awesome for that kind of stuff.

At room temperature, the termal conductivity is about 1.8 times as big as copper, and as a electrical insulator, you can directly attach it to the pn junction.

That way, the heat removal efficiency can easily be 2.5 times higher than with normal style leds (resulting in brighter lights and higher efficiency))

And diamonds are not THAT hard to make anymore. With CVD, you can grow diamond layers on wafers in a process thats only moderatly more expensive than the usual expensive semiconductor stuff (i guess 20k$ per wafer should be possible, maybe even lower nowadays).

http://www.cvd-diamond.com/tfdipo/linsen.jpg
some cute diamond lenses made by one of the frauenhofer institutes.

http://www.cvd-diamond.com/tfdipo/perlen.jpg
10cm wafer, 1.8mm thick.

Those are 5 years or so old, and i am sure the technology didnt recess in the meantime :D
 
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