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How come when I shine a light on an LED, I get a positive voltage?

J

J0hnny

Platinum Member
When shining a light onto the LED surface, I get a voltage reading on my volt meter. Is the LED acting like a photovoltaic cell?
 
Yeah pretty much. People have built laser power meters with those. Just a voltmeter and an LED, gotta calibrate it of course...
 
LEDs are diodes and IIRC, shining light on a diode will excite the electrons and change the balance of flux and diffusion of electrons so that there is a voltage. More sensitive diodes to light are photodiodes.
 
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