NITRIDE AND OXY-NITRIDE CERIUM BASED PHOSPHOR MATERIALS FOR SOLID-STATE LIGHTING APPLICATIONS

摘要

Three new cerium (Ce) based phosphor materials based on nitride and oxy- nitride compounds emit yellow or blue to green photons upon excitation by ultraviolet (UV) or blue light radiation. The two yellow emitting compounds belong to the quartenary Ca-Al-Si-N system with distinct structures. These bright yellow phosphors can be used for white light applications by combining either a blue light emitting diode (LED) and a yellow phosphor, a blue LED and green-orange phosphors, or an ultraviolet (UV) LED with three phosphors, i.e., red, blue and green (RGB) phosphors. The bright blue-green phosphor, which may( be described by Sr₂SiO_4-dN_d, can be used in the UV LED plus 3 RGB phosphors setup.