LED ( Light Emiting Diode)
There are many misconceptions about LED. Here is a humble effort to provide some basic information about the term LED, its advantageous, new technologies and developments in the LED lighting, how LED is eco friendly, energy saving factors etc, We source the information from reliable authors and websites and try to provide most accurate information's available today
What is LED:
A light-emitting diode or LED is a semiconductor electronics component. Semiconductors are materials whose electrical conductivity lies somewhere in between a conductor and an insulator. Unlike the majority of electrical components that are made of silicon, LEDs are typically made from gallium, another type of semiconducting material.
By doping or adding, impurities to the gallium crystal, p-type and n-type regions, areas in the crystal where there is an abundance of either positive nor negative charge carriers. In the p-type region, there is an abundance of positive charge carriers or holes and in the n-type region, there is an abundance of negative charge carriers or electrons. When a voltage is applied across the terminals of a LED, the charge carriers move with the electrons moving into the p-type region and the holes moving into the n-type region. When an electron meets a hole, it releases energy in the form of a photon or light.
This process in which a LED converts electricity in to light is known as electroluminescent where a material emits light in response to a current or electrical field. The advantage of this method over they have the efficiency at which energy is converted into light. Unlike fluorescent light bulbs, its efficiency is not affected by its shape or size.
Compared to the other methods for generating light in the home, the use of LEDs can lead to considerable savings in energy use. As gallium is considered to be non-toxic, a " dead” LED can safely and easily be disposed in the trash. The mercury found in fluorescent lamps is a dangerous neurotoxin and must be taken to an appropriate center that will either dispose or recycle them properly. The use of LED provides home owner with the options of a lighting source that is economical, efficient and environmentally friendly
LED technology is rapidly becoming an important part of our lives. As the prices drop and new technology is being developed, an average consume, as well as many businesses, are looking into switching all light fixtures from incandescent lights to LED lights. The savings in electricity are calculated to be up to 80 percent, if one considers their longevity and efficiency.
The main reason for the high efficiency of LED lights is the fact that they produce very little heat and hence, waste less energy. They emit light in one specific direction, where it is needed, without dispersing light pollution all over the space. In contrast, incandescent bulbs are made of a metal filament, which is heated by electricity until it glows. Almost 90 percent of electricity used to light an incandescent bulb is wasted on heat. LED lights remain cool while working. It is estimated that LED lights use up to 80 percentages less electricity than incandescent lights. Since Americans use 18 percentages of all their electricity for lighting, the country could save not only huge amount of money, but produce 80 percentage less carbon dioxide, a big step towards finding a solution for global warming.
LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, and faster switching. It is powerful enough for room lighting are relatively expensive and require more precise current and heat management than compact fluorescent lamp sources of comparable output.