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Technology Stocks : Wolf speed
WOLF 22.07-3.0%Dec 5 9:30 AM EST
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To: John Walliker who wrote (1992)2/10/2000 8:50:00 PM
From: mauser96   of 10714
 
The light photons generated in the semiconductor are created in random directions, but the only useful ones are those that that head in directions where they can eventually exit to produce useable light. Thus while LED do not have an "inherent" directional domination, they still put out light in dominant directions. As you so clearly put it, this is due to the optical properties of the semicondutor and substrate. The majority of the photons in present LED never get out of the chip . They are absorbed, producing heat. This leaves open the possibility of significant efficiency improvements by changes in mechanical shape and design. If LED are going to advance to the stage of common use in illumination they will require a lot of improving. As others have pointed out, likely there won't be be any huge leaps, but rather a series of smaller improvements. This kind of improvement tends to favor already established leaders so it's good for Cree.
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