What are LED? Environment Friendly, Energy Efficient and Durable

What are LED?

A light-emitting diode (LED) is an electronic light source.

LEDs are used as indicator lamps in  many kinds of electronics and increasingly for lighting. LEDs work by the  effect of electroluminescence, discovered by accident in 1907. The LED was  introduced as a practical electronic component in 1962. All early devices  emitted low-intensity red light, but modern LEDs are available across the  visible, ultraviolet and infra red wavelengths, with very high brightness.

LEDs are based on  the semiconductor diode. When the diode is forward biased (switched on),  electrons are able to recombine with holes and energy is released in the form  of light. This effect is called electroluminescence and the color of the light  is determined by the energy gap of the semiconductor. The LED is usually small  in area (less than 1 mm2) with integrated optical components to shape its  radiation pattern and assist in reflection.

LEDs present many  advantages over traditional light sources including lower energy consumption,  longer lifetime, improved robustness, smaller size and faster switching.

Applications of  LEDs are diverse. They are used as low-energy indicators but also for  replacements for traditional light sources in general lighting, automotive  lighting and traffic signals. The compact size of LEDs has allowed new text and  video displays and sensors to be developed, while their high switching rates  are useful in communications technology.



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