Concentration- and temperature- dependent luminescence quenching and optical transition of Sr2GdTaO6: Eu3+ phosphor for potential applications in white LEDs

• DOI: 10.1016/j.rinp.2023.107238
• Publication Date: 2023-12-12T19:21:27Z
• Authors: Li Wang; Yuhang Zhang; Duan Gao; Xuezhu Sha; Xin Chen; Yanqiu Zhang; Jinsu Zhang; Xizhen Zhang; Yongze Cao; Yichao Wang; Xiangping Li; Sai Xu; Hongquan Yu; Baojiu Chen
• Keywords: Chromaticity; Quantum Efficiency

A series of Eu3+ doped Sr2GdTaO6 (SGT) phosphors with double perovskite structure were synthesized via a high-temperature solid-state reaction approach. The crystal structure, morphology and luminescence properties characterized by means X-ray diffraction, transmission electron microscope, spectroscopy fluorescence decay lifetimes, respectively. Under the excitation 394 nm, intense red emission in visible region was observed SGT phosphors, critical quenching concentration derived to be 15 mol%. chromaticity coordinates color purity SGT: mol% calculated (0.61, 0.36) an 93.82%, Meanwhile, it also confirmed that electric quadrupole-quadrupole interaction is responsible for Eu3+. internal quantum efficiency different concentrations calculated. Furthermore, crossover process main mechanism thermal based on temperature-dependent spectra lifetimes. In addition, Judd-Ofelt parameters, radiative transition rates branch ratios from 5D0 emitting states various lower energy evaluated aid theory, All results indicate samples are promising red-emitting phosphor.