The idea is to allow the LED to switch on and off the photoconductive material via its fine projection .
Wu transformed the optical energy from low powered light emitting diodes ( LED ) into electrical energy via a photoconductive surface .
The idea is to allow the LED to switch on and off the photoconductive material via LED 's fine projection .
Wu transformed the optical energy from low powered light emitting diodes ( LED ) into electrical energy via a photoconductive surface .