Electronics & Software – Tips & Guide


What is the difference between LED and photodiode?

Main Difference between LED and Photodiode is that LED converts electrical energy in to Light and Photodiode convert light in to electrical energy. Let’s understand each one by one.


Light-emitting diodes (LEDs) are special purpose diodes. This gives visible light when polarized forward. Light-emitting diodes (LEDs) are widely used for indicative purposes. LED works based on the principle of electroluminescence.

LEDs are diodes that are designed to emit light when a current flows past it towards the front. This can also produce small voltages when struck by light, such as photodiodes (but not as effective). All diodes produce voltages when touched by light. Many of them are covered with black plastic or metal cans, in part to prevent this action. Diodes are silicon or germanium processed, LEDs in different materials, such as gallium arsenide phosphide (GaAsP) or indium gallium nitride (InGaN).

LED is synonymous with light-emitting diode. This is formed by a PN junction in front. When electrons in N-type semiconductors combine with holes in P-type semiconductors, they release energy in the form of light or heat.

Photo Diode:-

Photodiode works based on the principle of photoconduction. In photodiodes Because the electron hole pairs in generation, the flow of photos will flow.

The photodiodes receive light and create an electric current – in photovoltaic mode (creation of voltage when light hits) or in photoconductive mode (inverted refraction device). The advantage is a faster response than the photo stream due to a lower capacity. Photographs of silicon diodes or germanium treated.

A photodiode also consists of a PN junction diode, but when the surface of a PN junction is placed in a light source, the charge carrier in the photodiode becomes energy and begins to move. The movement of the charge carrier in the diode leads to generating the current in the photodiode.