Photoluminescence and optical temperature measurement of Mn4+/Er3+ co-activated double perovskite phosphor through site-advantageous occupation

Because traditional methods based on thermal coupling energy level temperature measurement have large errors, a new temperature sensing strategy is proposed to attain strong sensitivity and excellent signal resolution ability. The rare-earth and also transition metal ions with poles apart thermal quenching channels are used as dual emission centers to find a suitable host to achieve high-efficiency dual-mode emission. In this work, a string of phosphors with NaLaMgWO6 (NLMW) as the host, the single-doped and double-doped Mn4+ and Er3+ phosphors were adopted by the traditional high temperature solid-state reaction method. The crystallographic structure of the phosphor was analyzed by X-ray power diffraction and Rietveld refinement methods, and the results showed that a pure double perovskite phosphor with a monoclinic structure was successfully prepared. The photoluminescence excitation and emission spectrum properties, CIE chromaticity coordinates and photoluminescence spectra at different temperatures are detailed studied. Excited by ultraviolet light (300 nm), corresponding to the (4)A(2) > T-4(1) transition of Mn4+ and the charge transfer from O2- to W6+ of Er3+. There is no energy transfer between Mn4+ and Er3+. NLMW:Mn4+/Er3+ phosphors were especially sensitive to temperature changes within the scope of 303 K to 523 K. As the temperature increases, the fluorescence intensity of Mn4+ is thermally quenched faster than Er3+. The luminescent intensity ratio of Er3+ thermal coupling level and the FIR of Er3+/Mn4+ are used to study the temperature performance. The results show that the maximum relative sensitivity of FIR up to 1.31% K-1, which is higher than the maximum temperature sensitivity based on the thermal coupling energy level, and which is beyond most of the non-contact temperature measurement materials previously reported, confirming that NLMW:Mn4+/Er3+ phosphors have application potential in non-contact temperature measurement. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A new temperature sensing strategy was proposed to attain strong sensitivity and excellent signal resolution ability using NLMW:Mn4+/Er3+ phosphors, achieving high-efficiency dual-mode emission. Detailed analysis of crystallographic structure and spectrum properties revealed a maximum relative sensitivity of 1.31% K-1, indicating the potential application of NLMW:Mn4+/Er3+ phosphors in non-contact temperature measurement.