what exactly do you mean by led ?

 

What is an led ?

A very basic review of how light-emitting diodes function.

In the simplest definition is to think of a light-emitting device ( led full form) is a semiconductor device that releases light when an electric current flows through it. The light is created when the particles that carry this current (known as electrons and holes) join together in the semiconductor material.

Because light is produced within the semiconductors, they are also referred to as solid state devices. Solid-state illumination, which includes organic LEDs (OLEDs) is what distinguishes this kind of light from other sources using luminescent filaments which are 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 contained in energy bands. The distance between the bands (i.e. it is called the bandgap) determines the intensity of the photons (light particles) that are released by the LED.

The energy of the photon is what determines the intensity of light, and consequently, the color. Different semiconductors with different bandgaps emit various colors of light. The precise wavelength (color) is able to be controlled through changing the chemical composition of the light-emitting or active area.

LEDs are made of semiconductor compounds. These consist of elements of the group III and V of the periodic table (these are often referred to as III-V-based compounds). The most well-known III-V materials used to produce LEDs include gallium arsenide (GaAs) and gallium Phosphide (GaP).

The market for LEDs was a bit limited in colors and, specifically white and blue commercial LEDs were not available. The development of LEDs which were that were made of 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 applications.

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

  • Indium gallium Nitride (InGaN):blue, green and ultraviolet high-brightness LEDs
  • aluminum Gallium Phosphide (AlGaInP):yellow, high-brightness red and orange 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 percent more efficiently than conventional light bulbs. How do they work? An electrical current flows through the microchip. This lights the tiny light sources , also known as LEDs. This is visible lighting. To make sure that the LEDs function properly the heat generated by the LEDs is absorption by a heat sink.

Lifetime of LED Lighting Products

The life span for LED sources of light is determined differently than others sources of light, including incandescent, CFL also known as compact fluorescent lights (CFL). LEDs do not typically "burn out" or fail. Instead, they undergo 'lumen depreciation' that is when the LED's brightness decreases gradually over the course of. Contrary to the incandescent bulbs "lifetime" is established on the basis of when the brightness drops by 30.

How are LEDs Used in Lighting

LEDs are integrated into bulbs and fixtures for general lighting applications. Small in size, LEDs provide unique design opportunities. Certain LED bulb designs could physically look like traditional light bulbs and could enhance the appearance typical light bulb. Certain LED lighting fixtures could include LEDs that are a permanent light source. Also, hybrid solutions that use a non-traditional "bulb" or replaceable light source is employed and is specifically designed for an individual fixture. LEDs provide a huge potential for innovation in lighting design, and can be used in to a greater variety of applications than traditional lighting technology.

LEDs and Heat

LEDs make use of heat sinks that absorb the heat generated by the LED, and then disperse it back into the environment. This keeps LEDs from burning out. The control of temperature is often the main factor in the successful performance of an LED during its life. The higher temperatures the LEDs are operating at the higher the temperature, the faster the light's efficiency will diminish and the less efficient the time-to-use will be.

LED lighting solutions make use of a variety of unique heat sink designs and configurations to control heat. The advancements in technology have enabled manufacturers to develop LED bulbs that are similar to the dimensions and shapes of conventional incandescent bulbs. No matter the heat sink design, all LED products awarded the ENERGY STAR have been tested to confirm that they are able to manage heat to ensure that light output is properly maintained through the end of its life rated.

Read more about it here. led full form


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