Synthesis, Structure, and Photoluminescence Properties of Ce3+-Doped Ca2YZr2Al3O12: A Novel Garnet Phosphor for White LEDs

摘要

A novel garnet phosphor Ca2YZr2Al3O12:Ce3+ (CYZA:Ce3+) has been successfully designed and synthesited via the solid state method. The crystal structure, morphology, as well as their photoluinitescence properties were investigated in,detail, Undet near-Ultraviolet- (n-UV) excitation,. CYZA:Ce3+ exhibits cyan to green emiSsion with the maxima from 484 to 503 nth when varying the Ce3+ concentration. The internal quantum efficiency of the optimal sample is 56%. The concentration quenching of Ce3+ emission occurs via the energy transfer among the nearest-neighbor ions. The thermal stability is superior compared with the Ba2SiO4:Eu2+ commeteial phosphor. These results suggest that CYZA:Ce3+ can be conSidered as a potential candidate for white LEDs.