what exactly do you mean by led ?
what do you mean by led ?
A brief introduction to how light-emitting diodes work.
In its simplest form it is a light-emitting device ( led full form) is a semiconductor device that emits light when an electric current is passing through it. Light is produced when particles carrying this current (known as holes and electrons) mix within this semiconductor substance.
Since light is produced inside the semiconductor solid LEDs are classified as solid-state electronics. Solid-state lighting, which includes organic LEDs (OLEDs) sets this lighting technology from other sources of light that utilize heating filaments (incandescent and tungsten lamp halogens) (or gas discharge) (fluorescent bulbs).
Different colors
Inside the semiconductor of the LED the electrons and holes are contained in energy bands. The distance between the bands (i.e. that is the bandgap) determines the intensity that the photons (light particles) that are emitted by the LED.
The photon energy determines the wavelength of the emitted light and, consequently, the color. Different semiconductor materials with various bands produce various shades of light. The exact wavelength (color) can be altered by altering the structure of the light emitting or active, region.
LEDs are comprised of compound semiconductors composed of elements belonging to group III and group V of the periodic table (these are called III-V substances). Examples of III-V materials commonly employed to create LEDs are gallium arsenide (GaAs) and gallium phosphide (GaP).
Until the mid-90s LEDs had a limited range of colors, and in particular commercial blue and white LEDs were not available. The development of LEDs made of the gallium nitride (GaN) technology completed the range of colors and allowed for a variety of new possibilities.
Main LED materials
The main 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 of LED Lighting
What are LEDs and how do they work?
LEDstands for light emitting diode. LED lighting products create light that is up to 90 percent more efficiently than traditional incandescent light bulbs. How do they function? A voltage-driven current flows through a microchip, which produces light that is tiny. that we refer to as LEDs. The output is visible light. To ensure that the LEDs perform properly the heat generated by LEDs is transferred to a heat sink.
Lifetime of LED Lighting Products
The lifespan of LED lighting devices is defined differently than 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 are subject to 'lumen degradation in which the brightness of the LED dims slowly over time. Contrary to conventional bulbs, LED "lifetime" is established on a prediction of when the illumination decreases by 30 percent.
How are LEDs Used in Lighting
LEDs are incorporated into bulbs and fixtures to provide general lighting. Small in size, LEDs provide unique design opportunities. A few LED bulb designs may look similar to traditional lighting bulbs and are more in line with the appearance of conventional light bulbs. Some LED light fixtures include LEDs that are an ongoing light source. They also have hybrid solutions that use a non-traditional "bulb" or replaceable light source design is employed, and specially designed for the purpose of creating a unique fixture. LEDs are a fantastic chance to innovate in lighting form factors and fit a wider breadth of applications than traditional lighting technology.
LEDs and Heat
LEDs employ heat sinks to absorb the heat generated by the LED and disperse it to the environment. The heat sinks prevent LEDs from becoming overheated which can cause them to burn out. Temperature management is typically the most crucial factor in the successful performance of an LED over its lifespan. The higher the temperature at which the LEDs operate in, the more rapidly the light will degrade and the shorter the useful life will be.
LED lighting products make use of a variety of different designs for heat sinks and configurations for managing heat. Nowadays, advances in materials have enabled manufacturers to develop LED bulbs that are akin to the shape and size of traditional incandescent bulbs. No matter the heat sink design and shape, all LED products that have earned the ENERGY STAR have been tested to verify that they properly manage the heat so that light output is properly maintained through the end of their rated lifespan.
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