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Dual-emitting Mn4+-doped Tb3Al5O12 garnet phosphor for high-sensitive , self-referenced optical thermometry
Authors: Zhang, Y.; Li, MY; Luo, KK; Wang, JL; Xiao, JZ; Zhou, WW; Fang, YZ
Ref.: J. Lumin. 288, 121516 (2025)
Abstract: A series of novel Mn4+-doped Tb3Al5O12 (TAG) phosphors were successfully synthesized using a solvothermalassisted solid-state reaction under a weakly oxidizing atmosphere. The phosphors exhibit a direct band gap of 3.32 eV, with Tb-O and Mn-O groups significantly influencing their optical properties. The phosphor shows broad absorption bands in the 220-400 nm range, matching well with UV LED chips, and display blue (480-495 nm), green (530-570 nm), and orange-red (590-715 nm) emission bands under 270 nm UV excitation. The nephelauxetic ratio of TAG: Mn4+ is determined to be about 0.905. The optimal doping concentration of Mn4+ ions is 0.6 mol%, with energy transfer dominated by exchange interaction. The phosphor demonstrates high thermal stability (I150 degrees C = 85.0 %) with an activation energy of 0.59 eV and a high thermal quenching temperature (T50 = 511 K). The temperature sensing properties of TAG: Mn4+ are investigated based on the luminescence intensity ratio (LIR) technology. The phosphor shows high relative (3.46 % K-1) temperature sensitivities, exceptional resolution, and reproducibility in 298-523 K. It confirms its potential for applications in LIR-type optical temperature sensing.
