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Photoluminescence Characteristics of Eu 3+ -Doped Double-Perovskite Phosphors

2014; Institute of Physics; Volume: 3; Issue: 3 Linguagem: Inglês

10.1149/2.013403jss

2162-8777

Ruijin Yu, Cai‐Feng Wang, Jingtao Chen, WU Yong-kun, Hongjuan Li, Hailong Ma,

Microwave Dielectric Ceramics Synthesis

Eu3+-doped triple tellurium double perovskites LiBaLa[TeO6], NaBaLa[TeO6], LiBaBi[TeO6] and NaCaBi[TeO6] were synthesized by the general high temperature solid-state reaction. The crystal phase formations and morphology of the phosphates were confirmed by X-ray powder diffraction (XRD) and scanning electron microscope (SEM) measurements, respectively. The luminescence properties, including the photoluminescence (PL) excitation and emission spectra, decay curves (lifetimes), the color coordinates and the internal quantum efficiency (QE) were investigated. Eu3+-doped LiBaLa[TeO6], NaBaLa[TeO6], and LiBaBi[TeO6] show the dominated electric dipole transition 5D0→7F2 with a pure red luminescence color and a fast decay. However, Eu3+-doped NaCaBi[TeO6] presents the dominant reddish-orange emission from magnetic dipole transition 5D0→7F1 and a longer luminescence lifetime. The different luminescence features were discussed on the base of crystal structure, where Eu3+ ions have two possible substitutions on A or B sites in double tellurium perovskites.