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Dongguan Niannianwang Electronic Products Co.,Ltd

History Of LED Development

History of LED development

   Henry Joseph Round first observed electroluminescence in a piece of silicon carbide in 1907. Because the yellow light emitted by SiC is too dark to be suitable for practical application, and even more difficult is that SiC and electroluminescence can not be well adapted, the research has been abandoned.

   Bernhard Gudden and Robert Wichard used yellow phosphorus from zinc sulfide and copper to emit light in Germany in the late 1920s. Once again, it stopped because of the dim light.

    In 1936, George Destiau published a report on the emission of zinc sulfide powder. With the application of current and extensive understanding, the term "electroluminescence" finally appeared.

  In the 1950s, British scientists invented the first LED with modern significance in electroluminescence experiments using semiconductor GaAs, which was introduced in the 1960s. It is said that in the early experiments, LEDs need to be placed in liquefied nitrogen, and further operation and breakthroughs are needed to work efficiently at room temperature. The first commercial LED can only emit invisible infrared light, but it is rapidly applied in the field of induction and optoelectronics.

   In the late 1960s, the first visible red LED was invented using phosphide on GaAs substrates. GaP changes make LEDs more efficient, emit more red light, and even produce orange light.

     By the mid-1970s, gallium phosphide was used as a light source, and then grey-white and green light was emitted. LED uses double-layer GaP chips (one red and the other green) to emit yellow light. At this point, Russian scientists used diamond to produce yellow LED. Although it is less efficient than the European LED. But in the late 1970s, it emitted pure green light.

     The use of GaAs and Aluminum Phosphide in the early to mid-1980s led to the birth of the first generation of high brightness LEDs, first red, then yellow, and finally green. By the early 1990s, indium-aluminium-gallium phosphide was used to produce orange, orange, yellow and green LED. The first historic blue-light LEDs also appeared in the early 1990s, once again utilizing gold sand, an obstacle to early semiconductor light sources. According to today's technical standards, it is as dim as the Yellow LED in Russia before.

    In the mid-1990s, superluminous GaN LEDs appeared, and then high-intensity green and blue indium GaN LEDs were produced. Ultra-bright blue-light pistil is the core of white LED. Fluorescent phosphorus is coated on the luminous pistil and then converted into white light by absorbing the blue light source from the pistil. This technology is used to produce any visible color of light. Novelty colors such as light green and pink can be seen in the LED market today. Readers with scientific ideas may now realize that the development of LED has gone through a long and tortuous historical process. In fact, recently developed LEDs emit not only pure ultraviolet light, but also real "black" ultraviolet light. So it is not clear how far the development history of LED will go to low energy. Maybe someday we can develop an X-ray LED. Early LEDs could only be used for indicator lights, early calculator displays and digital watches. And now it's beginning to appear in the field of superluminance. It will continue for some time to come.

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