Li Guixian, Xue Yu, Mao Qinan, Pei Lang, He Hong, Liu Meijiao, Chu Liang, Zhong Jiasong
Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Dalton Trans. 2022 Mar 22;51(12):4685-4694. doi: 10.1039/d2dt00005a.
Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. Synergistic photoluminescence from different activators can realize high sensitivity for luminescent thermometers by finely selecting ions with specific crystallographic sites. Herein, the more temperature-sensitive Mn and the less-sensitive Eu (or Sm) activators are co-doped into a CaGdSbO matrix to form an effective thermometer, where Mn and Eu (or Sm) ions occupy the Sb and Gd sites, respectively. The co-doping of Eu ions or Sm ions leads to lattice expansion of CaGdSbO matrix and a tuned narrow emission from deep-red to orangish-red. According to the ratio of luminescence intensity, the maximal and values are 0.19 K (347 K) and 1.38% K (420 K) for CaGdSbO:Mn/Eu probe and 0.26 K (363 K) and 1.55% K (430 K) for CaGdSbO:Mn/Sm probe thermometers, respectively. In addition, thermometers based on Mn emission lifetimes can provide the highest relative sensitivity of 1.47% K at 425 K. Thus, the highly-temperature-sensitive CaGdSbO:Mn/(Eu or Sm) phosphor is a promising candidate for practical luminescence thermometers.
发光温度计提供了一种在纳米尺度上以高灵敏度和响应速度探测温度的非接触方法。来自不同激活剂的协同光致发光可以通过精细选择具有特定晶体学位置的离子来实现发光温度计的高灵敏度。在此，将对温度更敏感的锰和较不敏感的铕（或钐）激活剂共掺杂到CaGdSbO基质中以形成有效的温度计，其中锰和铕（或钐）离子分别占据锑和钆位置。铕离子或钐离子的共掺杂导致CaGdSbO基质的晶格膨胀以及从深红色到橙红色的调谐窄发射。根据发光强度比，CaGdSbO:Mn/Eu探针温度计的最大 和 值分别为0.19 K（347 K）和1.38% K（420 K），CaGdSbO:Mn/Sm探针温度计的最大 和 值分别为0.26 K（363 K）和1.55% K（430 K）。此外，基于锰发射寿命的温度计在425 K时可提供1.47% K的最高相对灵敏度。因此，对温度高度敏感的CaGdSbO:Mn/(Eu或Sm)荧光粉是实用发光温度计的一个有前途的候选材料。
