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LED lights work? Published :2008

LED lights work?

Light emitting diode LED is the abbreviation of the Chinese name of "light-emitting diode"

The laser light generated with similar principles.

An atom in a lot of electronic energy levels, when electrons from high energy to low-level transition, the electron's energy is reduced and less energy is converted into photon emission out. Large number of these photons is a laser.

LED principles similar. The difference is, however, LED is not through the internal electronic atomic jump to light, but the voltage is applied through the PN junction LED at both ends to form a PN junction level itself (in fact, is a series of energy level), then e-jump on this level and produce luminescence photons.

New LED display pieces with low power consumption, high brightness, long life, size, etc, and this article from the brief history of the development of LED display began to explore the surface mount LED, LED automotive applications and the development of LED lighting trends in Displays for the development of Chinese engineers has some reference value. Of the world's first commercial light-emitting diode (LED) in 1965, with material made of germanium, which is priced at 45 U.S. dollars.

1968, LED made breakthroughs in research and development, the use nitrogen-doped GaAsP technology makes the efficiency of the device reached a lumens / watt, and can be a red light, orange light and yellow light. By 1971, the industry launched with the same efficiency of GaP green die LED. 1972, a small number of LED displays for watches and calculators. The world's first LED watch was originally used in expensive jewelry stores, or sold, its price is as high as 2,100 dollars. Almost at the same time, Hewlett-Packard and Texas Instruments also introduced a red LED display with 7 calculator. 70 years of the 20th century, due to LED devices in the home and office equipment in a large number of applications, LED prices plunged. In fact, LED is the main figures of that era and text display. However, in many commercial devices, LED displays also came from the fierce competition of other display technologies such as LCD, plasma and vacuum fluorescent tube display.

This competitive incentive LED manufacturers to further develop their product type, and actively seek a clear competitive edge LED applications. Then applied the word dot-matrix LED display, background light pattern with gate and bar graph arrays. Digital display of the size and complexity is increasing, from 2 to 3-digit or even four, from 7 figures to be able to display complex combinations of text and images 14 or 16 array. 1980, manufacturers started to provide intelligent LED dot matrix display. The technological advances that make LED can be used in outdoor sports information release and the central high-mounted stop lamp car (CHMSL) device. Bright blue LED's invention to achieve true color display ad possible, so that the display can show true color, full-motion video images.

The emergence of blue LED back-line people can use the phosphorescent material will change the blue part of the higher energy converted into other colors. LED light sources are only able to fully cover the CIE chromaticity curve all the saturated colors and a variety of color LED and organic phosphorus can integrate virtually any color without restriction. In reliability, LED's half-life (ie, light output is reduced to half the initial value of the time) is about 10,000 to 100,000 hours. In contrast, the half-life of small direct-type incandescent lamps (where the half-life refers to the number of lamps fail half the time) the typical value is 10 million to thousands of hours varies, depending on the rated lamp current.
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