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What Is The Working Principle Of Led Photodiode?

Oct. 13, 2018

Infrared LED Phototransistor is a type of semiconductor diode that converts electrical energy into light energy. Led Photodiode, like a normal diode, consists of a PN junction and also has unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, holes injected from the P region into the N region and electrons injected into the P region from the N region are respectively separated from the electrons of the N region. The P region within a few micrometers near the PN junction. The hole complexes to produce fluorescence of spontaneous radiation. The energy states of electrons and holes in different semiconductor materials are different. When the energy released by the recombination of electrons and holes is different, the more energy is released, the shorter the wavelength of the emitted light. Commonly used are diodes that emit red, green or yellow light. The reverse breakdown voltage of the LED is greater than 5 volts. Its forward volt-ampere characteristic curve is very steep, and a current limiting resistor must be connected in series to control the current through the diode.

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Led Photodiode

Infrared LED Phototransistor