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Since the first practical visible-spectrum LED was developed in 1962, the development of LED has attained to such a high level that LED has been widely chosen as the best alternative to incandescent bulb, neon and fluorescent light in many areas. And it is predicted that with the further development of LED, the above-mentioned light sources would entirely give way to LED in the near future. And the future of the human being will be brighter since the common use of LED would save us a lot of energy, money, and time.
The development of LED can be roughly divided into three steps, which are the advent of red light LED, and then blue light LED, and white light LED. Red light and green light Led have been developed for decades, but they are all monochromatic LED, if they were used as light sources, objects illuminated would all wear the color emitted from the monochromatic LED, instead of the inherent color of the objects, so their applications are limited. The ultimate aim of LED development is super-bright white light LED that can actually replace the conventional light sources. lt has been a long and hard way to go until Shuji Nakamura, a Japanese scientist, managed to make a blue light LED from gallium nitride in 1993. lt turned out to be a crucial breakthrough in the development of LED. Based on the technology of blue light LED, a white light LED was soon invented in 1997,From then on, LED products have been widely used in many areas, and regarded as the light source of future. |
