For general lighting, people need a white light source. 1998 White Light LED Open
Success. The LEDs are packaged with GaN chips and yttrium aluminum garnet (YAG). GaN Chip Hair Blu-ray (λp =465nm, wd=30nm), high-temperature sintering of ce3+-containing YAG phosphors stimulated by this blue light emitted after the amber emission, peak 550nm. The Blu-ray LED substrate is mounted in a bowl-shaped reflector, covered with a thin layer of resin mixed with YAG, about 200-500nm. LED substrate emitted by the blue part of the phosphor absorption, another part of the blue and phosphor emitting yellow light mixture, you can get white. For Ingan/yag White LED, by changing the chemical composition of the YAG phosphors and adjust the thickness of the phosphor layer, you can get color temperature 3500-10000k colored white light.