in lab, we showed that leds can sometimes act as solar cells when excited by blue, green, amber, and red leds. which color(s) leds (the light sources) will induce a voltage in a green led (acting as the solar cell)?



Answer :

Blue lights and some green lights will induce a voltage in green led(acting as a solar cell)

LED working as a solar cell is a photodiode. For photodiodes to produce electric current they need to absorb photons. But they work only when they absorb photons of wavelength equivalent to or less than the specified LED and the wavelength of light it emits.

For LEDs to work as solar cells they must absorb photons of a specific wavelength and these absorbed photons initiate the formation of electron-hole pairs. LEDs have to be reverse-biased to work as solar cells.

Know which is correct about LEDs

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