The history of the development of LED

Thomas Edison invented the light bulb in the 19th century, before lighting the way human beings to achieve is very simple, that is, the fire source directly through a variety of direct light, such as candles, oil lamps and so on. Although these light-emitting devices in the human history ignited the long years, but because of low luminous efficiency and quality, and can only be gathering dust in the museum of history in the 20th century, with the new industrial revolution, human outbreak in Edison's new incandescent lighting represented, officially became the mainstream of human production and life light emitting apparatus.
In the incandescent lamp appears, electric lighting equipment of human society broadly through three important stages of development, the representation of the three stages of light were fluorescent, high intensity discharge lamps and LED light sources. Including high intensity discharge lamps due to stringent environmental requirements, high cost, this is not the mainstream lighting civilian areas, so our daily lives, light equipment, it was only incandescent, fluorescent and LED high bay light source which three categories.
In light of these three categories, LED lighting technology is the latest occurrence, benefits up to a lighting technology, therefore, since the emergence since the 1960s, along with the development of modern semiconductor technology, get a lot of universal application, especially in the 21st century, by the LED lighting technology ramifications auxiliary LED display technology and LED display technology, has revealed increasingly strong momentum of development.
In addition to the field is becoming popular everyday electric lighting LED light source, the current in the display area and the LED related equipment are mainly two: First, the direct use of LED imaging LED display, and the other is the use of LED light-emitting properties of the fine, the LED As the use of new television backlight LCD TV. Another high visibility OLED display technology, although only one more letter than the LED, but due to a large gap between the technical level, can be seen as a new class of display technology, it is not in the scope of this article.

The following is the history of the development of LED:
1907 Henry Joseph Round was first observed on a silicon electroluminescence. Yellow light emitted because of its dark, not suitable for practical application; further difficulty is that the silicon carbide and electroluminescence are not well adapted to study abandoned. Bernhard Gudden late twenties and Robert Wichard use in Germany from zinc sulphide and copper refining yellow phosphorus glow. Once again stopped due to dim glow.
In 1936, George Destiau published a ZnS powder on the report of the emitted light. With the current applications and extensive knowledge of the ultimate emergence of the "electroluminescence" This terminology. 1950s, British scientists in electroluminescent experiments using semiconductor gallium arsenide invented the first modern sense of the LED, and launched in the 1960s. It is said that in the early trials, LED needs to be placed in liquid nitrogen, the more the need for further action and to enable efficient breaking work at room temperature. The first commercial LED can only be issued only invisible infrared light, but were quickly applied to sensing and optical fields. The late 1960s, the use of gallium arsenide phosphide substrate invented the first visible red LED. Gallium phosphide change makes the LED more efficient, emit red light is much brighter, and even produce orange light.
The mid-1970s, gallium phosphide is used as the light source, and then to send ash Bai Lvguang. LED high bay light using gallium phosphide layer microarrays (one red the other is green) can emit yellow light. At this time, the Russian scientists issued a yellow diamond manufacture of the LED. Despite its efficient LED as Europe. But in the late 1970s, it can emit pure green light.
The early to mid 1980s, the use of aluminum phosphide on gallium arsenide so that the first generation of high brightness LED's birth, first red, followed by yellow, and finally green. To the early 1990s, the use of indium gallium aluminum phosphide to produce a tangerine, orange, yellow and green LED. The first historic blue LED also appeared in the early 1990s, once again using the emery - Early semiconductor light source obstructions. By today's technical standards to measure it with the Russians, like the previous yellow LED light dim.
The mid-1990s, there has been ultra-brightness GaN LED, which was then manufactured that produce high-intensity green and blue indium nitride gallium Led. Ultra-bright white LED blue microarrays is the core of the cast in this light-emitting fluorescent microarrays phosphorus and phosphorus fluorescence by absorbing the blue light from microarrays and then converted into white light. Is the use of this technology to produce any visible color of light. Today you can see the LED on the market produced by the novelty colors such as light green and pink. There is now scientific thought readers may be aware of LED high bay light development has experienced a long and tortuous history. Indeed, the recent development of the LED can not only emit ultraviolet light and can emit pure real "black" UV light. So the history of the low-energy LED go far, unknown. Maybe one day I will be able to develop an X-ray can be made LED. LED lights can only be applied early, early calculator displays and digital watches. And now began to appear in the ultra-brightness field. In the next period of time will continue.

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