Light emitting diode is also called LED, essentially, LED is just a tiny bulb, so it can be widely used in electronic circuits. The difference between LED and incandescent is that there is no burning filament in LED which made it not so hot while the using. Therefore here is an article about the simple principle of LED.
Someone may ask how does LED emit the light? Light is an energy form, when an atom releases its energy, the energy is released in the form of light. Light is formed by a lot of tiny units which contain the energy, the tiny unit is called photon, and it is the most basic unit of the light. Photon is released by the moving of electron. Inside an atom, electron is moving in a particular trace around the nucleus. Electrons in different orbits have different level of energy. Generally, electrons have greater energy are in a higher orbit further from the nucleus, an electron jumps from a higher orbit to a lower orbit will cause the release of energy in the form of a photon. The higher the energy level difference is, the more energy released. LED light works as the electron release photons, free electron move to positive region what is like an electron drops to a lower orbit and give out its energy in the form of a photon
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