Maybe you mean something other than the photoelectric effect? None of light-emitting-diodes, liquid-crystal-displays, or cathode-ray-tubes rely on the photoele

Maybe you mean something other than the photoelectric effect? None of light-emitting-diodes, liquid-crystal-displays, or cathode-ray-tubes rely on the photoelectric effect. https://en.wikipedia.org/wiki/Photoelectric_effect https://en.wikipedia.org/wiki/Photoelectric_effect