Zhang Yuhui, Guo Ning, Shao Baiqi, Li Jing, Ouyang Ruizhuo, Miao Yuqing
Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Oct 5;259:119797. doi: 10.1016/j.saa.2021.119797. Epub 2021 Apr 9.
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 NaLaMgWO (NLMW) as the host, the single-doped and double-doped Mn and Er 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 A→T transition of Mn and the charge transfer from O to W of Er. There is no energy transfer between Mn and Er. NLMW:Mn/Er phosphors were especially sensitive to temperature changes within the scope of 303 K to 523 K. As the temperature increases, the fluorescence intensity of Mn is thermally quenched faster than Er. The luminescent intensity ratio of Er thermal coupling level and the FIR of Er/Mn are used to study the temperature performance. The results show that the maximum relative sensitivity of FIR up to 1.31% K, 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:Mn/Er phosphors have application potential in non-contact temperature measurement.
由于基于热耦合能级温度测量的传统方法存在较大误差，因此提出了一种新的温度传感策略，以获得高灵敏度和出色的信号分辨率能力。具有截然不同热猝灭通道的稀土和过渡金属离子被用作双发射中心，以寻找合适的基质来实现高效双模发射。在这项工作中，采用传统的高温固态反应法，制备了一系列以NaLaMgWO（NLMW）为基质的单掺杂和双掺杂Mn和Er的磷光体。通过X射线粉末衍射和Rietveld精修方法分析了磷光体的晶体结构，结果表明成功制备了具有单斜结构的纯双钙钛矿磷光体。详细研究了光致发光激发和发射光谱特性、CIE色度坐标以及不同温度下的光致发光光谱。在紫外光（300 nm）激发下，对应于Mn的A→T跃迁以及Er的O到W的电荷转移。Mn和Er之间不存在能量转移。NLMW:Mn/Er磷光体在303 K至523 K范围内对温度变化特别敏感。随着温度升高，Mn的荧光强度比Er更快地发生热猝灭。利用Er热耦合能级的发光强度比和Er/Mn的FIR来研究温度性能。结果表明，FIR的最大相对灵敏度高达1.31% K，高于基于热耦合能级的最大温度灵敏度，并且超过了先前报道的大多数非接触式温度测量材料，证实了NLMW:Mn/Er磷光体在非接触式温度测量中具有应用潜力。
