A light-emitting diode, often called an LED. The light-emitting diode is just a tiny light bulb. But unlike the usual incandescent bulbs, the light-emitting diodes have no filament, and they are not particularly hot, it is simply electronically moving in the semiconductor material to make it light. Because the light-emitting diodes without filament will burn, so life is longer. And light-emitting diodes of small plastic bulbs make the light-emitting diode more durable, coupled with the LED can be more easily suitable for the current electronic circuit. The traditional incandescent light-emitting process involves generating a lot of heat, which is completely a waste of energy. The light emitted by the light-emitting diodes is very small, relatively speaking, the more direct light is to reduce the greater demand for electricity.
A form of energy, one that can be released by atoms. Is composed of a lot of energy and power but not the quality of small particles like a small bundle. These particles are called photons, the most basic unit of light. Photon is released because of electronic movement. In the atom, electrons move in orbit around the atom. The electrons have different energy in different orbital functions. In general, electrons with greater energy move away from the nucleus by orbit. As electrons jump from a lower orbit to a higher orbit, the energy level increases, and in turn, the electrons release energy when falling from a higher orbit function to a lower orbit function. The energy is released in the form of photons. Higher energy drops to release higher energy photons, which are characterized by its high frequency.
Free electrons from the p-type layer through the diodes fall into the empty electron holes. This involves falling from the conduction band to a lower orbital function, so electrons release energy in the form of photons. This will happen in any of the diodes, and when the diodes are made of a substance, you can only see the photons. In the standard silicon diode atoms, for example, when the electrons fall to relatively short distance atoms are arranged in such a way. As a result, the human eye can not be seen because of the low electronic frequency.
Visible light LED, such as the use of digital display clock, the size of the gap determines the frequency of photons, in other words, determines the color of light. When all the diodes are emitted, most are not very effective. In a conventional diode, the semiconductor material itself attracts a large amount of light and ends. The light emitting diode is covered by a plastic bulb that focuses the light in a particular direction.
The price of semiconductor parts has been drastically reduced over the past 10 years, believing that future light-emitting diodes are a more cost-effective lighting option in a wider range of applications.