Luminescence Property of Eu~(3+)-doped CaZrSi_2O_7 Phosphors for White LEDs

摘要

Eu~(3+)-doped CaZrSi_2O_7 phosphors with promising luminescent properties have been successfully prepared through microwave heating. The crystallinity and luminescent performance were characterized by powder X-ray diffraction pattern, photoluminescence spectra, respectively. The results show that the obtained Eu~(3+)-doped CaZrSi_2O_7 phosphors have good crystallinity, and strong emission under near-ultraviolet (NUV) light excitation, which emits red colors peaking at 615 nm, corresponding to the ~5D_0→~7F_2 electric-dipole transition of Eu~(3+) which shows the rare earth Eu~(3+) ions are located in noncentrosymmetric sites. The red emission of Eu~(3+)-doped CaZrSi_2O_7 phosphors is excellently consistent with CIE chromaticity standards. It is suggested that the as-prepared Eu~(3+)-doped CaZrSi_2O_7 samples have high potential for phosphor-converted white LEDs application.