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Development of White Light LED
Apr 24, 2017

For general lighting, people need a white light. 1998 White light led development succeeded. This led is the GAN chip and yttrium aluminum garnet (YAG) encapsulated together. Gan chip hair blue (λ p =465nm, Wd=30nm), high-temperature sintering of the Ce3+-containing YAG phosphor produced by this Blu-ray fired yellow light emitting, peak 550nm. The Blu-ray led substrate is mounted in a bowl-shaped reflective cavity, covering a thin layer of resin with a YAG mixture, about 200-500nm. LED substrate emitting Blu-ray partially absorbed by Phosphor, another part of Blu-ray and phosphor emit yellow mixture, can get white light. Now, for the InGaN/YAG White led, by changing the chemical composition of the YAG phosphor and regulating the thickness of phosphor layer, the color temperature 3500-10000K can be obtained from the colored white light.

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