Electroluminescence
Electroluminescence (pronunciation: e-lek-tro-lu-mi-nes-cence) is a phenomenon where a material emits light in response to an electric current or a strong electric field. This is a form of Luminescence and is used in a wide variety of applications including Light Emitting Diodes (LEDs) and Liquid Crystal Displays (LCDs).
Etymology
The term "Electroluminescence" is derived from the Greek words "electron" which means amber, and "lumin" which means light. It was first used in the early 20th century to describe the phenomenon of light emission from a material under the influence of an electric field.
Principle
Electroluminescence occurs when a material, typically a Semiconductor, is subjected to an electric field, causing the material to emit light. This light emission is caused by the recombination of Electrons and Holes in the material. When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a Photon.
Applications
Electroluminescence is used in a wide variety of applications. It is used in the backlighting of LCD displays in televisions and computer monitors. It is also used in the production of LEDs, which are used in a wide variety of lighting and display applications. Other applications include optical communications, photovoltaics, and sensors.
Related Terms
External links
- Medical encyclopedia article on Electroluminescence
- Wikipedia's article - Electroluminescence
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