what exactly do you mean by led ?

 

What does an "led" mean? ?

An extremely basic overview of the workings of a light-emitting diode.

In its simplest form the simplest way, a light-emitting diode ( led full form) is an electronic device that emits light when an electric charge is passing through it. The light is created when the particles carrying this current (known as holes and electrons) are incorporated into the material of semiconductor.

Because light is produced within the semiconductor solid LEDs are referred to as devices that are solid state. The term "solid-state lighting," that also includes organic LEDs (OLEDs) is what differentiates this type of lighting from other sources using glowing filaments that are heated (incandescent and tungsten Halogen lamps) as well as gas discharge (fluorescent lamp).

Different colors
In the semiconductor material of the LED the electrons and holes are contained in energy bands. The band separation (i.e. that is the bandgap) determines the intensity that the photons (light particles) which are released from the LED.

The energy of the photon determines the wavelength of light emitted and, consequently, the color. Different semiconductor materials with various bandgaps create different shades of light. The exact wavelength (color) can be adjusted by changing the composition of the light emitting, or active region.

LEDs are composed of compound semiconductors, composed of elements belonging to groups III and V in the periodic table (these are referred to as III-V substances). The most common III-V materials employed to create LEDs include gallium arsenide (GaAs) and gallium Phosphide (GaP).

In the early 90s, LEDs were only available in only a few colors particularly commercial white and blue LEDs were not available. The introduction of LEDs that were based on the gallium-nitride (GaN) materials system expanded the color palette and allowed for a variety of new possibilities.

Main LED materials
The most important semiconductor materials that are used in the production of LEDs are:

  • Indium gallium Nitride (InGaN):blue, ultraviolet and green high-brightness LEDs
  • Aluminium gallium Phosphide (AlGaInP):yellow, red and orange high-brightness LEDs
  • Aluminium 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 emit light as high as 90 percent more efficiently than incandescent light bulbs. What is the mechanism behind them? A current of electricity flows through a microchip. This produces light that is tiny. known as LEDs. The output is visible light. To avoid performance issues the heat that LEDs generate is then absorbed by a heat sink.

Lifetime of LED Lighting Products

The lifespan of LED lighting devices is different from that of other sources of light, like incandescent and CFL, or compact fluorescent light (CFL). LEDs generally do not "burn out" or fail. Instead they undergo 'lumen depreciation which is when the LED's brightness decreases gradually over the course of. In contrast to incandescent bulbs "lifetime" is established on an estimate of when the brightness decreases by 30 percent.

How are LEDs Used in Lighting

LEDs are integrated into fixtures and bulbs for general lighting purposes. Small in size, LEDs provide unique design opportunities. Certain LED bulb options might physically resemble traditional light bulbs , and may better complement the look of conventional light bulbs. Certain LED lighting fixtures could contain LEDs as an indefinite light source. Additionally, there are hybrid solutions that use a non-traditional "bulb" or replaceable light source is employed and specifically designed to create an unusual fixture. LEDs provide a huge chance to innovate in lighting design and can be used in more applications than traditional lighting technology.

LEDs and Heat

LEDs utilize heat sinks to absorb the heat generated by the LED, and then disperse it to the environment. This prevents LEDs from overheating or burning out. The management of thermal energy is usually the most crucial element in the performance of an LED throughout its life. The more heated the LEDs operate and the faster the light's performance will decrease and the less lifespan of the LED will be.

LED bulbs utilize a variety of different designs for heat sinks and configurations for managing heat. Modern advances in materials allow manufacturers to create LED bulbs that are akin to the dimensions and shapes of conventional incandescent bulbs. Whatever the heat sink design the majority of LED products that have been awarded the ENERGY STAR have been tested to make sure that they are able to manage the heat to ensure that light output is optimally maintained until the end of their rated lifespan.

Read more about it here. led full form


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