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Technology Stocks : Wolf speed
WOLF 22.07-3.0%Dec 5 9:30 AM EST
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To: Guy Gordon who wrote (1984)2/10/2000 4:03:00 PM
From: FLSTF97   of 10714
 
FWIW, I saw that HP/Agilent has developed a new way to extract more light from LEDS that involves simply shaping.

Essentially instead of having the LED shaped like two books stacked on one another, they use an inverted pyramidal shape. I didn't explore it in detail so I'm not sure of the mechanism. Probably has to do with the incidence angle of the light to the periphery surface.

In the clip you posted this line seems counter intuitive as it relates to the semiconductor layers:

Transparent substrates and thick semiconductor layers increase the extraction efficiency.

I would think that thicker layers means more trapping of the light generated at the interface. Could be they mean the depletion layer thickness.

In general I agree with your original response to Lucius, except that I would think that if you could make at least one of the layers thin enough you might extract some small percentage more light. OTOH I'm not sure that is feasible within the constraints of the device parameters itself (I'm thinking the doping concentrations and field strengths of the various layers.)

This probably doesn't help sort out the situation any better, sorry Lucius, but I wouldn't be expecting any quantum leaps in performance by using more transparent materials.

FATBOY
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