what exactly do you mean by led ?

 

What is an led ?

An extremely brief outline of how light emitting diodes work.

In the most basic terms the simplest definition can be described as a light emitting diode ( led full form) is the semiconductor device that releases illumination when an electric current is moved through it. The light is created when the particles carrying the current (known as electrons and holes) mix within this semiconductor substance.

Since light is generated within the semiconductors, they are also referred to as solid state devices. Solid-state lightingthat also encompasses organic LEDs (OLEDs) is what differentiates this type of lighting from other sources with glow filaments heated (incandescent and the tungsten halogen lamp) or gas discharge (fluorescent bulbs).

Different colors
Inside the semiconductor of the LED the electrons and holes are housed in energy bands. The distinction between the bands (i.e. that is what is known as the bandgap) determines the intensity of the photons (light particles) which are released via the LED.

The energy of the photon will determine the intensity light and, in turn, the color. Different semiconductors that have different bandgaps emit different shades of light. The precise wavelength (color) is able to be controlled through changing the composition of the light emitting active area, also known as the active region.

LEDs are composed of semiconductor compounds. They comprise elements belonging to groups III and V on the periodic table (these are known as III-V-based materials). The most well-known III-V materials used to make LEDs include gallium arsenide (GaAs) and gallium phosphide (GaP).

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

Main LED materials
The principal semiconductor materials used in the production of LEDs are:

  • Indium gallium nitride (InGaN):blue, ultraviolet and green high-brightness LEDs
  • aluminum gallium Phosphide (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 emit light that is up to 90% more effectively than traditional light bulbs. What are they? A current of electrical energy is passed through the microchip. The microchip then lights tiny LEDs that light up the. The result is visible lighting. To ensure that LEDs work properly the heat generated by LEDs is then taken up by a heat sink.

Lifetime of LED Lighting Products

The duration for LED sources of light is defined differently than the various sources of light including incandescent, CFL or compact fluorescent light (CFL). LEDs generally do not "burn out" or fail. Instead, they experience "lumen depreciation', which is when the LED's brightness diminishes slowly over. As opposed to incandescent bulbs "lifetime" is established on an estimate of when light intensity decreases by 30.

How are LEDs Used in Lighting

LEDs are used in fixtures and bulbs for general lighting applications. Small in size, LEDs provide unique design opportunities. Some LED bulb designs may physically resemble conventional light bulbs , and may better complement the look conventional light bulbs. Certain lighting fixtures with LEDs could contain LEDs that provide a permanent light source. Also, hybrid options where a non-traditional "bulb" or replaceable light source is employed and is specifically designed for an individual fixture. LEDs present a tremendous possibility for innovative lighting design, and can be used in to a greater variety of applications than conventional lighting technologies.

LEDs and Heat

LEDs use heat sinks to absorb the heat generated by the LED and disperse it back into the environment. This keeps LEDs from burning out. Controlling temperature is generally the major aspect in the success of LEDs over their duration of life. The more heated the LEDs are used more, the faster their efficiency will decrease and the shorter the time-to-use will be.

LED lighting products make use of a variety of innovative designs and configurations that control the heat. The advancements in technology enable manufacturers to design LED bulbs that are akin to the shape and size of traditional incandescent bulbs. In spite of the shape of the heat sink, all LED bulbs that have been awarded the ENERGY STAR have been tested to determine if they properly manage the heat so that light output is properly maintained until the end of their life rated.

Find out more information here. led full form


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