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LED colors question

8/14/1999 9:04 PM
Pat FLED colors question
This is one of those burning questions I've always meant to ask. Recently blue LEDs have become available. I've noticed that they are much more expensive than your run of the mill red, green and yellow LEDs. I guess I always thought that LEDs derived their color from the plastic they were encased in, until I bought some clear ones that were bright red when lit up. So, what is it that determines the color of LEDs and why are the blue ones so expensive? Is it the semiconductor material itself that determines color?

MKB Hi, Pat. It is usually the materia... -- 8/14/1999 11:36 PM
R.G. What they told us in semiconductor ... -- 8/15/1999 1:28 PM