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YELLOW SiC FROM THE EARLY-1970s FROM THE U.S.S.R.
These amazing pictures show a very rare yellow-emitting SiC LED from Russia.
Manufactured sometime between 1972 and 1973, this greenish-yellow LED gets its light from a chip of silicon carbide, a material
most of you know as an abrasive substance used for sandpaper! Although fluorescence in SiC was discovered by Henry Joseph Round as early as 1907, this is the first known practical application for that ghostly greenish glow.
The LED's light output (from its normal "this side up" orientation) is only 10 Ácd (that's ten microcandelas).
It came in two versions: a tiny pinhead-sized glass encapulated version like this for commercial use, and another in a sturdy metal can for military use.
I have a lot of additional information about this LED hidden away in various e-mails, but since a lot of damage was done in the Ash Wednesday 2001 earthquake, it will be quite a while before I can pry myself away from disaster recovery and fetch that info - actually as of 05-23-08, that information is completely irretrievable.
And as of 10-11-04, I no longer even have these wonderful critters (they were lost during a move I made), so I am not able to perform spectroscopy of them either.
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