🚀 go-pugleaf

In article <1992Aug7.104606.8663@iccgcc.decnet.ab.com> moskin@iccgcc.decnet.ab.com writes:
>>From "LED Circuits and Projects", by Forrest M. Mims, III, 1973:
>>	In recent years, a family of semiconductor devices capable of
>>	emitting visible and infrared light has become available.
>>	Semiconductor light emission was first discovered in 1907 by
>>	H.J. Round, but it was not until 1960 that efficient light 
>>	generation in a semiconductor was obtained.


  Now this has gotten me interested!
  Can some device-physics/solid-state pro. tell me what material is used
to get the three colors in an led?  How big are these junctions?  How are
multiple colored leds made in the same casing? Are they made with two 
junctions or is it a nifty junction which emits different wavelengths
of light when polarised differently? Are there any tri-color leds available
in the market today?

-Shailendra
ssave@ole.cdac.com