Insight into site occupancy of cerium and manganese ions in MgAl2O4 and their energy transfer for dual-mode optical thermometry
Insight into site occupancy of cerium and manganese ions in MgAl2O4 and their energy transfer for dual-mode optical thermometry
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深入了解 MgAl2O4 中铈和锰离子的位点占用及其用于双模光学测温的能量转移
DOI：
10.1016/j.jallcom.2022.166701
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Qiuhong Zhang
中科院分区：
文献类型：
--
作者：
Xiaoqing Li;Huijuan Yu;Fen Yao;Haiyong Ni;Rui Sun;Jianbang Zhou;Jianhong Ding;Junhao Li;Qiuhong Zhang
采用传统的固相反应法合成了铈、锰单掺杂和共掺杂的MgAl 2 O 4。XRD精修和第一性原理计算表明，Mn 2+优先取代Mg 2+，Ce 3+更优先取代MgAl 2 O 4基体中的Al位。有效的能量转移使得共掺杂的荧光粉的光致发光光谱显示出Ce 3+在359 nm附近的紫外（UV）发射和Mn 2+在516 nm处的绿色发射峰。Ce 3+和Mn 2+的发射带分离，显示了良好的信号分辨率.由于Mn 2+的相对热稳定性和Ce 3+的强烈热猝灭性，通过测量Ce 3+与Mn 2+的荧光强度比（FIR）和Ce 3+的寿命来评价所制备的荧光粉的温度敏感性能。在448 K时，FIR模式的Sr值最大为0.5 9%K-1，而在5 2 3 K时，寿命模式的Sr值最大为0.40%K-1.令人满意的重复性使其适用于双模光学测温。第一性原理计算表明Ce 3+优先取代Al 3+位。阐明了MgAl 2 O 4中Ce 3+向Mn 2+的能量传递机理。评价了MgAl 2 O 4：Ce 3+，Mn 2+在双模测温中的应用潜力。· MgAl 2 O 4：Ce 3+，Mn 2+在FIR和寿命技术中显示出高的重复性。
The cerium, manganese solely and co-doped MgAl 2 O 4 have been synthesized via traditional solid-state reaction. XRD refinement and the first-principle calculation indicate that the Mn 2+ preferentially substitutes for Mg 2+ while Ce 3+ is more preferential for the substitution of Al site in MgAl 2 O 4 matrix. Effective energy transfer enables the photoluminescence spectra of the co-doped phosphors to show both ultraviolet (UV) emission of Ce 3+ at around 359 nm and green emission of Mn 2+ peaked at 516 nm. The separated emission bands of Ce 3+ and Mn 2+ indicate the good signal resolution. Due to relative thermally stable of Mn 2+ and huge thermal quenching of Ce 3+ , the temperature sensing performance of the prepared phosphor was evaluated by measuring fluorescent intensity ratio (FIR) of Ce 3+ to Mn 2+ and lifetime of Ce 3+ . The maximum of the S r values is 0.59%K -1 at 448 K for FIR mode and 0.40%K -1 at 523 K for lifetime mode, respectively. Satisfactory repeatability makes it suitable for dual-mode optical thermometry. • First-principle calculation indicates Ce 3+ preferentially substitutes Al 3+ site. • The energy transfer mechanism from Ce 3+ to Mn 2+ in MgAl 2 O 4 was demonstrated. • The potential of MgAl 2 O 4 :Ce 3+ , Mn 2+ for dual-mode thermometry was evaluated. • MgAl 2 O 4 :Ce 3+ , Mn 2+ shows high repeatability by both FIR and lifetime technologies.
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DOI：
10.1016/j.jeurceramsoc.2019.07.027
发表时间：
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期刊：
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