荧光粉
发光
兴奋剂
双功能
拉曼光谱
分析化学(期刊)
化学
材料科学
发射强度
光电子学
光学
有机化学
物理
催化作用
作者
Teng Zheng,Laihui Luo,Peng Du,Stefan Lis,Ulises R. Rodríguez‐Mendoza,V. Lavı́n,Marcin Runowski
标识
DOI:10.1016/j.cej.2022.136839
摘要
Remote temperature and pressure monitoring provides new and exciting chances to explore the variation of luminescence properties of compounds under extreme conditions. Herein, series of Mn4+-activated, double perovskite Gd2ZnTiO6 phosphors were prepared to develop novel, bifunctional sensors of temperature and pressure. Upon 345 nm excitation, bright red emission originating from Mn4+ is generated, and its intensity is affected by doping content, where the optimal intensity is achieved at 0.3 mol% of Mn4+ doping. The determined concentration quenching mechanism is mainly governed by a dipole–dipole interaction. The internal and external quantum efficiencies of the synthesized phosphors are as high as 95.6% and 83.2%, respectively. Besides, the crystal-field strength and nephelauxetic effect are theoretically discussed to identify their impacts on the emission characteristics of Mn4+. Furthermore, via analysing the temperature-dependent emission bandwidth and lifetime, the thermometric properties of the resultant phosphors are explored, and the maximum relative thermal sensitivities for the Gd2ZnTiO6:Mn4+ phosphor with optimal doping are 0.34% and 2.43% K−1 at 423 K, respectively. Additionally, the influence of pressure on the luminescence performance of the studied phosphors is investigated. When pressure increases, a significant red-shift of the emission band is observed, showing the pressure sensitivity is as high as 1.11 nm/GPa. Notably, during the compression and decompression processes, the prepared phosphors possess stable phase structure, which is confirmed by the pressure-dependent Raman spectra. These results suggest that the highly-efficient double perovskite Mn4+-activated Gd2ZnTiO6 phosphors are promising bifunctional luminescent platforms, for both luminescence thermometry and manometry applications.
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