Red Luminescence Properties of TiZn_2O_4 Phosphor

摘要

The red phosphor (TiZn_2O_4) is formed from TiO_2 and ZnO via simple solid-state reaction. This red phosphor is prepared by chemically stable as well as inexpensive oxide materials. Emission and excitation spectra are investigated for this phosphor. Photoluminescence (PL) measurements reveal that this phosphor emits bright red emission at 611 nm, which is associated with ~5(D_0) - ~7(F_2) transition, with near UV (395 nm) and blue light excitation (470 nm). The measured decay time of this red emission can be fitted well with a fast decay time of 67 μs and a slow decay time of 208 μs, respectively. A broad grain size distribution is observed for TiZn_2O_4 phosphor. Further, photoluminescence excitation (PLE) shows a good absorption band near UV, and the blue spectral region of visible spectrum as well. The optical properties, X-ray diffraction (XRD) measurements, and scanning electron micrographs (SEM) of this TiZn_2O_4 phosphor are studied.