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

• Published in: Results in physics Vol. 56; p. 107238
• Main Authors: Wang, Li, Zhang, Yuhang, Gao, Duan, Sha, Xuezhu, Chen, Xin, Zhang, Yanqiu, Zhang, Jinsu, Zhang, Xizhen, Cao, Yongze, Wang, Yichao, Li, Xiangping, Xu, Sai, Yu, Hongquan, Chen, Baojiu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2024; Elsevier
• Subjects: Concentration quenching; Eu3; Judd-Ofelt analysis; Sr2GdTaO6; Thermal quenching; Judd-Ofelt analysis; Eu3; Sr2GdTaO6; Thermal quenching; Concentration quenching
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2023.107238

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