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LED development
Jul 08, 2017

For general lighting, people need a white light source. In 1998 the white light LED open Success.


This LED is the GaN chip and yttrium aluminum garnet (YAG) made together. GaN chip with blue light (λ p = 465nm, Wd = 30nm), high temperature sintered Ce3 + -based YAG phosphor was excited by this blue light emitted after the yellow light emission, the peak 550nm. The blue LED substrate is mounted in a bowl-shaped reflective cavity, covering a thin layer of resin mixed with YAG, about 200-500 nm. The blue part of the LED substrate is absorbed by the phosphor, and the other part of the blue light and phosphor yellow light mixed, you can get white light. For InGaN / YAG white LED, by changing the chemical composition of YAG phosphor and adjust the thickness of the phosphor layer, you can get the color temperature of 3500-10000K of colored white light.


Blu-ray LED technology, simply is a more energy efficient lighting mode, but also can be applied to the camera, mobile phones and other technology products. Lighting equipment with blue LED technology, higher energy efficiency, greatly reducing the use of the Earth's energy. According to the available data, 25% of the world's electricity is used for lighting, and the use of LED lamps, the power used for lighting down to 4%, which undoubtedly changed the whole world.


From the 1907 LED effect found to 1993 in the village of two officially invented LED, and then to 1999 1W LED lights officially commercial use, LED has experienced nearly a hundred years of development. Prior to this, people have been using the last century Edison invented incandescent bulbs, and incandescent bulbs wasted most of the energy in the heat, about 90% of the electricity are wasted.


LED lamps appear, greatly reducing the power required for lighting, the same wattage of the LED lights, the required power is only incandescent bulb 1/10, while LED has a long life, environmental protection, maintenance-free advantages, quickly replace the incandescent position. In 2012, the Chinese government announced that a total ban on the sale and import of more than 100 watts of ordinary lighting incandescent, accompanied by the older generation of Chinese incandescent lamp is about to come to the end of history.

As the Nobel Prize in Physics wrote: "The incandescent light illuminates the twentieth century, and the LED lights will illuminate the 21st century."