scott wrote:
> That's how LED works (they're diodes!),

It's not so much because they're diodes as it is because they're quantum 
semiconductors, actually.  Vacuum tube diodes don't work this way, for 
example.

You have to apply enough voltage to push the electrons on the N side 
past the depletion zone in the middle, after which you've filled up all 
the holes and away you go.

-- 
Darren New / San Diego, CA, USA (PST)

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