Dual emitting from Bi3+/Eu3+ co-activated Sr3La2Ge3O12 phosphor for optical thermometry

• Published in: Optical materials Vol. 115; p. 111036
• Main Authors: Shen, Yuyu, Chen, Yi, Chen, Liang, Deng, Degang, Xu, Shiqing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2021
• Subjects: Dual-emitting centers; Energy transfer; Sr3La2Ge3O12; Temperature sensing; Sr3La2Ge3O12; Temperature sensing; Dual-emitting centers; Energy transfer
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2021.111036

An optical thermometer Bi3+, Eu3+ co-doped Sr3La2Ge3O12 (SLGO) phosphor with dual-emitting centers was synthesized in high-temperature condition. The X-ray diffraction patterns, SEM, EDS, luminescent properties and optical temperature sensing characteristics were exhaustive investigated. Under UV excitation, the SLGO: Bi3+ phosphor exhibits the 3P1→1S0 blue luminescence of Bi3+ peaked at 400 nm and SLGO: Eu3+ phosphor shows the 5D0→7F2 red luminescence of Eu3+ peaked at 612 nm. The ET behavior was proved by spectrum overlap between the PL spectrum of Bi3+ and PLE spectrum of Eu3+. Moreover, the decay time of Bi3+ could be verified the conclusion. Under UV excitation of 291 nm, the maximal value of absolute sensitivity (Sa) of SLGO: Bi3+, Eu3+ was 0.079 %K−1 at 573 K, and relative sensitivity (Sr) was 0.831 %K−1 at 473 K. The results proved that SLGO: Bi3+, Eu3+ phosphor could have a good performance in the field of optical thermometer. •The Sr3La2Ge3O12: Bi3+, Eu3+ phosphors can conquer the inherent defects of TCL-based phosphors.•The Sr3La2Ge3O12: Bi3+, Eu3+ phosphors have high temperature sensitivity and signal discriminability.•The ET behavior and temperature-dependent sensing properties of Bi3+ and Eu3+ are discussed.