Light Emitting Diode (LED) - in ECET Physics (Chapter Electronics)

Light Emitting Diode (LED):

An LED is a type of electronic device that emits light when a voltage is applied to it.
LEDs are commonly used in electronic displays, lighting, and indicators because they are energy-efficient, long-lasting, and available in a range of colors.

The principle of LED is based on the phenomenon of electroluminescence, which is the emission of light from a material when an electric current is passed through it.
In an LED, a semiconductor material such as gallium arsenide is doped with impurities to create a p-n junction.
When a voltage is applied to the p-n junction, electrons and holes recombine, releasing energy in the form of photons, which produces light.

LEDs are used in a wide range of applications, including electronic displays, lighting, and indicators.
They are commonly used as indicator lights on electronic devices such as smartphones, televisions, and computers.
They are also used in traffic signals, streetlights, and automotive lighting. LEDs are preferred over traditional incandescent bulbs because they are more energy-efficient, longer-lasting, and emit less heat.
They are available in a range of colors, including red, green, blue, and white, which makes them useful for a variety of applications.