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Industry News >> Key technological breakthroughs in the development of LED
In the history of LED development can not be separated from the rapid progress of technology. Every time a breakthrough, the characteristics of LED have been greatly improved. What are the key technological breakthroughs in the development of LED, this paper will analyze the development of LED technology from LED to the present day.

In 1907, the phenomenon of electro luminescence was observed in SiC.

In 1954, the GaP single crystal was made and its properties were studied.

In 1955, observed GaP luminescence phenomenon

In 1962, the observed GaAs PN junction phenomenon

In 1962, the development of GaAs infrared (870-980nm) LED, LD (wavelength of 650nm, is now widely used in laser pen, DVD machine);

In 1962, the development of GaAs system red LED;

In 1963, the development of GaP system red LED;

In 1965, GaP was introduced into the N and other electron luminescence centers.

In 1966, the external quantum efficiency of GaAs infrared LED was 6%;

n 1967, the external quantum efficiency of ZnO GaP: infrared LED was 2%

In 1969, the electro optic conversion efficiency of SiC blue LED was 0.005%

In 1969, the external quantum efficiency of GaP red LED was 7.2%

In 1972, the external quantum efficiency of the GaAsP system was developed by LED, which was 0.2%.

In 1972, the external quantum efficiency of ZnO GaP: red LED was 15%

In 1977, the external quantum efficiency of GaAsP red LED was 0.1%

In 1981, confirm the blue luminescence of GaN system.

In 1985, the development of four yuan crystalline AlGaInP orange LED

In 1986, the development of AIN system GaN low temperature accumulation buffer layer technology

In 1992, the external quantum efficiency of the GaN system of the blue PN homogeneous junction two tube was up to 1%

In 1994, GaInN/AiGaN heterojunction PN junction type high brightness blue LED (1CD)

In 1995, the external quantum efficiency of GaInN double heterojunction blue LED was up to 10%

In 1995, the development of the GaInN system of green LED

1997, developed the use of fluorescent powder white LED, light efficiency of 51m/W

In 2001, A1GaInP series: the processing technology that attached on the transparent substrate

In 2002, the performance of white LED was improved by the use of blue light and yellow phosphor, and the light efficiency was 62lm/W

In 2004, the performance of white LED was improved by the use of blue light and yellow phosphor, and the light efficiency was 80lm/W

In 2009, the research and development of multi surface emitting LED light bulbs, to achieve 360 degree full range of lighting.

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