The fluorescence self-healing mechanism and temperature-sensitive properties of a multifunctional phosphosilicate phosphor
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The temperature-dependent fluorescence characteristic is a key index of rare-earth ion-doped functional materials. In this paper, the structure, photoluminescence property, trap distribution and self-healing mechanism are studied in detail by XRD, photoluminescence spectra, decay times, the temperature-dependent fluorescence characteristic and cathodoluminescence spectrum. We developed a multicationic site phosphosilicate phosphor Ca8Al2(PO4)6(SiO4): Ce3+, Mn2+ to obtain the luminous self-healing property. In this work, we tried to change the energy and density distributions of traps by designing and adjusting synthesis scheme of target material and finally realized self-suppression of emission declined by energy compensation from traps or energy transfer between Ce3+ and Mn2+. As we expected, photoluminescence intensity of Ce3+ and Mn2+ at 250 °C is 40% and 300%, respectively, of their initial intensity at ambient temperature for co-doped representative sample, and it indicates that the emission degeneration of Mn2+ is obviously suppressed with the increase in temperature. A highly thermally sensitive fluorescence intensity ratio is obtained in a broad temperature range, and it implies that this material could be applied to a temperature sensing sensor. The fitting and calculated results show a good signal discriminability with the maximum absolute sensitivity 0.0097 K−1 and maximum relative sensitivity 2.1% K−1, respectively.
This work was supported by the National Natural Science Funds of China (Nos. 11864038 and 51462031), the Natural Science Foundation of Gansu Province of China (Grant No. 1606RJYA262), the Scientific Research Projects of Gansu colleges and Universities (Grant No. 2017A-009), China Postdoctoral Science Foundation (Grant No. 2016M592909XB), Creation of Science and Technology of Northwest Normal University, China (Grant No. NWNU-LKQN-15-9), and the Fundamental Research Funds for the Central Universities (lzujbky-2017-sp23).
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