History of the development of LED
① 1962 years, GE, Monsanto, IBM has developed a joint laboratory of the gallium arsenide red phosphorus (GaAsP) semiconductor compounds, from the visible light-emitting diodes into the commercial development process.
② 1965, the world's first commercialization of the birth of light-emitting diode, which is made of germanium material may be issued by the L-infrared India and the price was about 4 5 U.S. dollars. Shortly thereafter, Monsanto and Hewlett-Packard introduced the use of commercial GaAsP material of the red LED, the efficiency of this LED is about 0.1 lumens per watt, than the average 6-10-watt incandescent lamp of 15 lumens per watt is lower on the more than 100 times.
③ 1968 years, LED R & D have made breakthroughs in the use of nitrogen-doped GaAsP technology so that the efficiency of the device reached the 1 lm / W, and can issue a red light, orange light and yellow light.
④ 1971, the industry also launched the Gap with the same efficiency green chip LED. As the LED devices in the home and office equipment of a large number of applications, LED prices began to fall for.
⑤ 80 early major technological breakthrough is the development of a AIGaAs LED, it 10 lumens per watt issue a red light-emitting efficiency. LED technology advances that can be used in outdoor high information and automotive brake light (CHMSL) equipment.
⑥ 1990, the industry has developed to provide the equivalent of the best properties of red AIInGaP device technology, which at that time than GaAsP device performance standards 10 times higher.
⑦ 1990, the United States GREE Introduces SiC materials based on silicon carbide LED, based chip developed the first high-brightness blue light-emitting diodes, the efficiency is about 0.0 4 lumens per watt, 1994, Japanese scientists in Shuji Nakamura resulting Ga N on GaN-based LED research and development boom.
⑧ 20 the late 90 century, Japan developed to stimulate the adoption of Blu-ray have a YAG phosphor white LED. With the continuous advancement of technology in recent years, white LED have developed rapidly, the luminous efficiency white LED has reached 501 m / W, results of laboratory studies have reached 100I m / W, much higher than incandescent to fluorescent light levels. Lumileds years
⑨ 1998 companies on their use of large-size chip package of 1 W-class high-power (High Power LED) device, the first time in the world showing the semiconductor light into the dawn of the field of general lighting.
The development of LED as the same computer, to comply with the development of Moore's Law, that is, every 18 months, its brightness will be doubled, from 1991 to the present, material technology, chip size and light form so that the further development of commercial LED's flux increased nearly 3 0 percent. Today, the color display required for trichromatic red, green, blue and orange, yellow colors of L and India have reached a candela of luminous intensity level to achieve the ultra-high brightness, and full color, and the full color LED-based display and solid-state lighting has become a reality.
