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The LED have gone through 50 years of development history
2013-6-5 ：
- LED lighting development today, both the luminous efficiency and the quality of the products is to improve the quality of. But few people know, LED's development has gone through 50 years of history.
LED as a new type of lighting products, from twenty-first Century began to be popularized energetically. The development of LED has come a long way. When it comes to the development of LED, we have to say LED's invention.
In 1907, Henry Joseph Rod (HenryJosephRound) for the first time in a piece of silicon carbide (SiC) in the observed electroluminescence phenomenon. Because the light is too dim a yellow, not suitable for practical application; more difficulty lies in silicon carbide and electroluminescence can not adapt to the good, then abandoned research.
In 1936, GeorgeDestiau published a zinc sulfide powder emission light report. With the current application and widely recognized, culminating in the "El" this term.
In 1955, Radio Corporation America (RadioCorporationofAmerica) Lubin Brown Shi Tai (RubinBraunstein) was first detected in gallium arsenide (GaAs) infrared radiation and other semiconductor alloys.
In 1962, Ge Corp's Nick Holon Yake (NickHolonyakJr.) developed the first practical application of the visible light emitting diode.
Nineteen seventies metaphase, gap is used as the light source, then a pale green. LED adopts a double-layer gap chip (one red and the other one is green) can emit yellow light. At this time, Russian scientists use emery manufacturing out of the yellow light LED. Although it is inferior to European LED efficient. In the late 70's, it can emit green light.
In 1993, Japan's Nichia chemical industry (NichiaCorporation) the work of Nakamura Shuji (ShujiNakamura) successfully put nitrogen infiltration, created the wide band gap semiconductor gallium nitride based on (GaN) and indium gallium nitride (InGaN), has the commercial value of the blue LED. There is a blue LED, white LED also guide was published. After LED toward increasing the brightness of the direction of development, when LED power generally are less than 30 to 60mW (MW).
LED commercialization 1999 input power of 1W. These LED in semiconductor chip giant to deal with high energy input, and the semiconductor chip is fixed on the metal plate, in order to help heat dissipation.
In 2002, the market began to 5W LED, the number of LED in luminous efficiency was approximately 18-22lm/W.
In 2003 September, CREE (Cree) shows its new Blu-ray LED, power efficient 20mW rate was 35%. They also created a 65lm/W white LED commodity, which is on the market at that time the most bright white LED. In 2005 they unveiled a white LED prototype, in 350mW, a record of the efficiency of each tile 70lm.
In 2009 February, the Japanese LED manufacturer Nichia chemical (Nichia) released efficiency as high as 249lm/W LED, which is measured in the laboratory data, is also the time of light emitting the highest efficiency of LED.
In 2010 February, PhilipsLumileds in the laboratory to create a white LED, in the standard test conditions driven by 350mA current efficiency reached 208lm/W, but because the company did not disclose the bias voltage at the time, did not know their power.
In February 13, 2013, CREE (CREE) announced its LED research, 276lm/W light effect again refresh record light effect. In April 11th, Philips (PHILIPS) shows the new sample of the LED bulb. The LED lamp light color is warm white, light efficiency of up to 200lm/W, far more than the current market lighting products.
In order to reduce energy consumption, promote green lighting, many countries have formulated the elimination of incandescent lamp, LED lighting plan, began to eliminate the traditional lighting.
Australia as early as in 2007 February decided in 2010 to stop using the ordinary incandescent lamp, replace sb. Is LED lighting products, Australia became the world's first plan to ban the use of traditional incandescent state.
In April 25, 2007, the Canadian natural resources minister Gary Lunn announced, Canada is scheduled to start in 2012 banned the sale of incandescent lamp, become Australia second announced that the state of incandescent lamp will disable.
Japan in 1998 to take the lead in the implementation of "twenty-first Century lighting" plan, expected to be completed in 2006 with white LED lighting to replace 50% traditional lighting, and plans in 2010 to achieve the LED luminous efficiency up to 120lm/w. In 2008 April the Japanese government appealed to strive in 2012, the full realization of switching from incandescent to fluorescent lamp and LED lighting.
The United States President Obama came to power after the actively promote environmental protection and efficient energy policy, the latest news is that CREE (Cree) has reached a cooperation with the United States Department of defense, the use of LED lighting lamps in the The Pentagon. In addition to the United States Department of energy to develop the "semiconductor lighting the national research project" plan, plans to use 10 years time, to invest $500000000 in the United States of America in the future so that the semiconductor lighting, lighting market competition, ahead of Japan, Europe and South Korea and other competitors. And plans in 2010 with LED to replace the incandescent lamp and fluorescent lamp 55%; 2012 LED luminous efficiency reached 150lm/w; in 2025, LED lighting will make the lighting electricity consumption is reduced by half, saving $35000000000 a year.
The EU summit in 2008 to reach an agreement, decided the EU will gradually replace incandescent lamps with energy-saving lamps; the EU proposed legislation banning the production of incandescent bulbs from 2009 start. Energy ministers of member states of the European Union asked the European Commission to make plans before the end of 2008, from 2010 onwards banned in the EU, including sales of incandescent lamp high consumption