what exactly do you mean by led ?

 

what is the meaning by"led" ?

A brief overview of how light-emitting diodes work.

In its most basic form, it's a light-emitting device ( led full form) is a semiconductor device that produces light when the current of electricity flows through it. The light is produced when the particles carrying the current (known as electrons and holes) mix inside this semiconductor substance.

Because light is produced within the semiconductor solid LEDs , they are classified as solid-state electronics. Solid-state lighting, that includes organic LEDs (OLEDs) is a distinct lighting technology from other sources of light that rely on heated filaments (incandescent and tungsten lamp halogens) (or gas discharge) (fluorescent bulbs).

Different colors
Inside the semiconductor in the LED the holes and electrons are contained within energy bands. The distance between these bands (i.e. that's the bandgap) determines the intensity that photons (light particles) emit when they are powered by the LED.

The energy of a photon determines the wavelength of light that is emitted and, therefore the hue. Different semiconductors with different bands create different hues of light. The exact duration (color) may be changed by altering the structure of the light emitting, or active region.

LEDs are made up of compound semiconductors comprised of elements from group III and group V of the periodic table (these are referred to as III-V substances). Some examples of III-V compounds commonly used to make LEDs include gallium arsenide (GaAs) and gallium Phosphide (GaP).

Up until the mid-90s, LEDs offered a limited range of colors. In particular, commercial blue and white LEDs were not available. The introduction of LEDs made of the gallium nutride (GaN) technology expanded the range of colors and offered a variety of new options.

Main LED materials
The most important semiconductor materials 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
  • What are LEDs and how do they work?
  • Lifetime of LED lighting products
  • Where to use LED Bulbs
  • LEDs and Heat
• How is LED lighting different?
• How can I get using ENERGY STAR(r) authorized LED lights?

The Basics of LED Lighting

What are LEDs and how do they work?

LEDstands for light emitting diode. LED lighting products emit light that works approximately 90 percent more efficient than conventional incandescent light bulbs. What are they? A current that is driven by voltage flows through a microchip, which creates light that is small. We refer to them as LEDs. This output of light is known as visible. To ensure that the LEDs perform properly the heat that LEDs generate is transferred to the heat sink.

Lifetime of LED Lighting Products

The duration for LED lights is defined differently from other sources of light like incandescent lights and CFL as well as compact fluorescent light (CFL). LEDs do not typically "burn out" or fail. They are instead subject to 'lumen degradation where the brightness of the LED gradually decreases as time. Contrary to conventional bulbs, LED "lifetime" is established on an estimate of when the illumination decreases by 30 percent.

How are LEDs Used in Lighting

LEDs can be integrated into bulbs and fixtures for general illumination. Small in size, LEDs provide unique design opportunities. Certain LED bulb designs might look like conventional lighting bulbs, and have more of the appearance of traditional lighting bulbs. Some LED lighting fixtures have LEDs that operate as a continuous source of light. They also offer hybrid solutions that use a non-traditional "bulb" or replaceable light source. The design of the light source is utilized specifically designed to create an original fixture. LEDs offer a great opportunity to invent lighting forms elements and can be used in 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 disperse it to the surroundings. The heat sinks keep LEDs from overheating which could cause them be destroyed. Temperature management is generally the most important factor in the performance of an LED over its lifespan. It is the higher temperature which the LEDs operate in the greater speed the light will degrade and the less effective the lifespan will be.

LED lighting products incorporate a range of designs for heat sinks and designs for managing heat. Modern advances in materials have enabled manufacturers to develop LED bulbs that are similar to the size and shape that traditional bulbs. Whatever the heat sink shape or design the majority of LED products that have received the ENERGY STAR have been tested to ensure that they are able to manage heat so that their light output is properly maintained through the end of their rated time.

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