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what do you mean by led ?

An introduction to the way light emitting diodes work.

In its simplest sense, it's a light emitting device ( led full form) is a semiconductor device that emits light when the current of electricity flows through it. Light is created when particles that carry this current (known as holes and electrons) mix inside this semiconductor substance.

Because light is produced within the semiconductor , solid LEDs can be described as being solid-state electronics. Solid-state lighting, that includes organic LEDs (OLEDs) distinguishes this lighting technology from others sources, which use heated filaments (incandescent or tungsten lamps Halogens) (or gas discharge) (fluorescent bulbs).

Different colors
Inside the semiconductor of the LED the holes and electrons are contained within energy bands. The distance between the bands (i.e. that's the bandgap) determines the amount of intensity photons (light particles) that are emitted by the LED.

The energy of the photon determines wavelength of light emitted and, therefore, the color. Different semiconductors that feature different bands emit different hues of light. The duration (color) could be modified by altering the structure of the light emitting, or active region.

LEDs are composed from compound semiconductors that are composed of elements from group III or group V on the periodic table (these are called III-V substances). Some examples of III-V compounds commonly used to make LEDs include gallium arsenide (GaAs) and gallium Phosphide (GaP).

In the early 90s, LEDs were available in limited shades, and in particular commercial white and blue LEDs were not readily available. The introduction of LEDs made of the gallium nutride (GaN) technology extended the spectrum of colors and provided a wide range of new options.

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

  • Indium Gallium Nitride (InGaN):blue, ultraviolet and green high-brightness light bulbs
  • aluminum gallium Phosphide (AlGaInP):yellow, high-brightness red and orange LEDs
  • aluminum 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 that can be approximately 90 percent more efficient than conventional incandescent light bulbs. What are they? A voltage-driven current runs through a microchip creating light that's small. which we call LEDs. The output is visible light. To ensure that the LEDs are working properly, the heat generated by LEDs is transferred to the heat sink.

Lifetime of LED Lighting Products

The duration that LED lighting equipment has is defined differently from the different sources of light, such as incandescent light and CFL also known as the compact fluorescent light (CFL). LEDs generally do not "burn out" or fail. However, they can be affected by 'lumen degradation' in which the brightness of the LED dims slowly over time. Contrary to conventional bulbs they are not subject to 'lumen degradation' "lifetime" is established on the assumption that the illumination decreases by 30.

How are LEDs Used in Lighting

LEDs are used in fixtures and bulbs that provide lighting general. Small in size, LEDs provide unique design opportunities. Certain LED bulb designs may look similar to traditional lighting bulbs and are more in line with the style of traditional lighting bulbs. Some LED light fixtures include LEDs that operate as a continuous light source. They also have hybrid lighting solutions that make use of a non-traditional "bulb" or replaceable light source and designed specifically to make an original fixture. LEDs provide a wonderful opportunity to innovate in lighting form factors and cover a wider range of applications than conventional lighting technology.

LEDs and Heat

LEDs make use of heat sinks that absorb the heat generated by the LED and release it to the surroundings. They prevent LEDs from overheating which could cause them melt out. Management of temperatures is usually the most crucial element to the successful performance of an LED over its lifespan. As high the temperatures which the LEDs work, the more rapidly the light's performance will diminish and the shorter its useful life will be.

LED lighting products incorporate a range of different styles for heat sinks and configurations for managing heat. Today, advancements in materials enable manufacturers to design LED bulbs that look similar to the size and shape typical incandescent lamps. However, regardless of the heat sink design and shape it is important to note that all LED products that have been awarded the ENERGY STAR have been tested to confirm that they are able to manage heat so that light output is adequately maintained until the end of their rated time.

Find out more information here. led full form


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