I have no idea about the physical or geometrical differences between them, but I do know that LEDs can be used as cheap replacements for photodiodes in some applications. Of course, not drop-in replacements because there are electrical and characteristic differences. As far as I know the characteristic differences are LEDs are much slower (in response) than photodiodes and LEDs would only detect light which has shorter wavelength than themselves. The elctrical differences would be the biasing and the VI response.Originally posted by Mazaag@Apr 18 2006, 05:20 PM
I was reading an article about using LEDs as touch-sensing devices. Is it true that a "switched off" LED acts as a Photodiode? What is the structural difference between a LED and a Photodiode?
|Thread starter||Similar threads||Forum||Replies||Date|
|H||Help me ID these micro LEDs please?||Datasheets, Manuals & Parts Identification||7|
|Using Ht12e , ht12d is it suitable nowadays to control high power leds||Wireless & RF Design||10|
|P||Design a circuit to light the LEDs?||Analog & Mixed-Signal Design||9|
|M||LEDs or photodiodes in voltage multiplier ladders||Sensor Design & Implementation||1|
|Random question about LEDs and photodiodes||Sensor Design & Implementation||1|