Constructing dual-mode optical thermometry based on Mn4+/Eu3+ luminescence intensity ratio and lifetime for double perovskite Ca2ScNbO6 phosphors

• Published in: Journal of rare earths 2024-11
• Main Authors: Li, Yidong, Li, Li, Lu, Yi, Wang, Yongjie, Zhou, Xianju, Ling, Faling, Jiang, Sha, Xiang, Guotao
• Format: Article
• Language: English
• Subjects: Dual-emitting centers; Dual-mode measurement; Lifetime; LIR; Rare earths
• ISSN: 1002-0721
• DOI: 10.1016/j.jre.2024.11.013

A novel series of Mn4+ and Eu3+ co-doped double-perovskite Ca2ScNbO6 (CSNO) phosphor was synthesized in this work. The phase structure and photoluminescence properties were systematically researched. Due to the different thermal quenching properties of Mn4+ and Eu3+ ions, a dual-mode temperature measurement technique over a wide temperature range was established. The CSNO phosphor co-doped with Mn4+ and Eu3+ ions has a self-calibrated effect due to the different thermal quenching effects of Mn4+ and Eu3+ ions. The maximum relative sensitivity (SR1,R2) values of the CSNO:0.1 mol%Mn4+/0.5 mol%Eu3+ phosphor are determined to be 1.92%/K and 1.76%/K at 523 K, under excitation at 296 and 396 nm, respectively. Additionally, the temperature-dependent lifetime of Mn4+ indicates that the maximum SR3,R4 values for the synthesized phosphors are 1.669%/K (λex = 296 nm) and 1.664%/K (λex = 396 nm), respectively. It is interesting to note that different SR can be obtained by varying the excitation wavelength to the CSNO:0.1 mol%Mn4+/0.5 mol%Eu3+ phosphor. Ultimately, this work provides a reference for the development of highly sensitive fluorescent materials based on dual-emitting centers of double-perovskite. Dual-mode optical thermometry based on Mn4+/Eu3+ luminescence intensity ratio and lifetime for double perovskite Ca2ScNbO6:Mn4+,Eu3+ phosphor. [Display omitted]