From: MC elover (mcelover@yahoo.com)
Date: Tue Apr 03 2001 - 08:38:29 PDT
Message-ID: <20010403153829.28561.qmail@web905.mail.yahoo.com> Date: Tue, 3 Apr 2001 08:38:29 -0700 (PDT) From: MC elover <mcelover@yahoo.com> Subject: colored LED's
hello everyone!
i am currently playing around with colored LED's and
trying to make a lab relating frequency of light to
energy. i remember paul d doing something like this.
basically i put Red Orange Yellow and Green LED's on a
breadboard in parallel and hook up a variable voltage
source. sure enough, the Red lights up first at about
1.3 Volts then the others follow in order finishing
with Green at about 1.8 Volts. Then comes Blue. It
took about 3.0 Volts to light up the blue light!?!
That was strange enough, but then i took a "white"
LED. only 2.6 Volts to light it. hmmm. i thought
for sure that it really couldn't be white, so out came
the spectroscope and .... ... a pretty good spectrum!
This all brought up the fact that i have a very poor
understanding of how LED's really work. I know its a
semiconductor thing which means that probably no one
knows for sure what's happening. Then i began to
realize that i don't quite understand what's happening
with the other colors and why the voltage has to
increase to get higher frequency colors. it amkes
sense to state simply that higher freqs = more energy
and more volts = more energy, but i have a feeling
that "it's more complicated than that!"
keep the funk alive
--eric
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