Development
of white LED For general lighting purposes, people need a white light.
Mid-1998, the white of the LED developed. This LED is the GaN Chips and
yttrium aluminum garnet (YAG) into a single package made. GaN chip to
emit blue light (λ p = 465nm, Wd = 30nm), made of high-temperature
sintering of YAG containing Ce3 + phosphor excited by this blue light
after the yellow light-emitting, peak 550nm. Blue LED Substrate
installed in the reflective cavity bowl, cover with thin layer of resin
mixed with YAG, about 200-500nm. LED-based films have been issued by
the Blu-ray part of the phosphor absorbed, and some Blu-ray and issued
by the yellow phosphor mixture can be too white. Now, for the InGaN /
YAG white LED, by changing the chemical composition of YAG phosphor and
regulation of the thickness of phosphor layer can be obtained color
temperature 3500-10000K in colored white. |
