Rare Earth Luminescent Materials for White LED Solid State Lighting

摘要

Solid-state white LED will be a new generation of energy-saving light source in 21 century. In order to emitting white light, one of important approaches is using luminescence conversion technology with rare earth phosphors, which can be excited by the 460 nm blue light or 400 nm near violet light emitted from the InGaN chip and then emit white light. The rare earths doped phosphors prepared by us such as YAG∶Ce 3+, Ca 1-xSrxS∶Eu 2+, Ga2S3∶Eu 2+, MGa2S4∶Eu 2+（M=Ca, Sr, Ba）, SrGa 2+xS 4+y∶Eu 2+, （Ca 1-xSrx）Se∶Eu 2+, SrLaGa3S6O∶Eu 2+, （M1, M2） 10（PO4）6X2 （M1=Ca, Sr, Ba; M2=Eu, Mn; X=F, Cl, Br） and NaEu 0.92Sm 0.08（MoO4）2 were reported. They emit blue, green, yellow or red color light. Some white LEDs were made by these phosphors with blue or near violet InGaN chips and their chromaticity coordinate （x, y）, correlated color temperature TC, and color rendering index Ra are reported.