what exactly do you mean by led ?

 

What is an led ?

An extremely brief overview of how light-emitting diodes function.

In the most basic terms the simplest definition can be described as a light emitting diode ( led full form) is a semiconductor device that produces illumination when an electric charge is passed through it. Light is generated when particles carrying the current (known as holes and electrons) mix within the semiconductor material.

Since light is generated within the semiconductor solid LEDs are known as solid-state devices. Solid-state lighting, which also includes organic LEDs (OLEDs) is what distinguishes this kind of lighting from other sources with glow filaments heated (incandescent and the tungsten halogen lamps) or gas discharge (fluorescent bulbs).

Different colors
Within the semiconductor of the LED, the electrons and holes are housed in energy bands. The distinction between the bands (i.e. it is called the bandgap) determines the energy of the photons (light particles) which are released via the LED.

The photon energy determines the intensity of the light and, consequently the color. Different semiconductors with different bandgaps emit different shades of light. The exact wavelength (color) can be controlled through changing the composition of light emitting, or active area.

LEDs are made of semiconductor compounds. These consist of elements of groups III and V of the periodic table (these are known as III-V-based material). The most well-known III-V materials used to make LEDs are gallium arsenide (GaAs) and gallium phosphide (GaP).

The LED market was limited colors and, particularly, commercial blue and white LEDs weren't available. The advent of LEDs that were were built on the gallium-nitride (GaN) materials system, which was the basis for the colors available and also opened the door to a wide range of new possibilities.

Main LED materials
The primary semiconductor components used to make LEDs are:

  • Indium gallium Nitride (InGaN):blue, ultraviolet, and green high-brightness light bulbs
  • aluminium gallium phosphate (AlGaInP):yellow, orange and red high-brightness LEDs
  • Algalium gallium arsenide (AlGaAs):red and infrared LEDs
  • Gallium Phosphide (GaP):yellow and green LEDs

Learn About LED Lighting

The Basics of LED Lighting

What are LEDs and how do they work?

LEDstands for light emitting diode. LED lighting products produce light as high as 90 percent more effectively than traditional light bulbs. What is their purpose? A current of electricity is passed through a microchip. This lights the tiny LEDs, which are light sources. The product is visible lighting. To make sure that the LEDs function correctly, the heat produced by LEDs is then taken up by a heat sink.

Lifetime of LED Lighting Products

The lifespan of the LED source of light can be determined differently than others sources of light, such as incandescent or CFL, and compact fluorescent light (CFL). LEDs do not typically "burn out" or fail. Instead, they undergo 'lumen depreciation which is when the LED's brightness decreases gradually over the course of. Contrary to the incandescent bulbs "lifetime" is established on an estimate of when the brightness decreases by 30.

How are LEDs Used in Lighting

LEDs are included in fixtures and bulbs to provide general lighting. Small in size, LEDs provide unique design opportunities. Certain designs of LED bulbs could physically look like conventional light bulbs , and might be a better match for the style of traditional light bulbs. Certain lighting fixtures made of LED could comprise LEDs that function as permanent lighting sources. They also offer hybrid lighting solutions which use a different "bulb" or replaceable light source is employed, and it is created for an individual fixture. LEDs offer a great potential for innovation in lighting design and are utilized in a wider variety of applications than traditional lighting technology.

LEDs and Heat

LEDs utilize heat sinks to absorb the heat generated by the LED. They then release it to the environment around it. This stops LEDs from burning out. Controlling temperature is generally the major factor in the successful performance of an LED over its life. The more hot the LEDs are operated at and the more quickly the light's efficiency will decline and the shorter its time-to-use will be.

LED bulbs utilize a variety of innovative heat sink designs and configurations that control the heat. The advancements in technology have allowed manufacturers to develop LED bulbs that match the shape and size of conventional incandescent bulbs. Whatever the shape of the heat sink, all LED bulbs that have been given the ENERGY STAR have been tested to verify that they are able to manage heat so that the their output of light is adequately maintained at the end of its time of rating.

read more >> led full form


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