Zhou Liuyan, Chen Yanling, Shen Yuyu, Lin Jianhua, Fu Jie, Lei Lei, Ye Renguang, Deng Degang, Xu Shiqing
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China.
Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, China.
Inorg Chem. 2022 Jul 18;61(28):10667-10677. doi: 10.1021/acs.inorgchem.2c00769. Epub 2022 Jul 6.
Down/upconversion CaAlZnO inorganic phosphors codoped with Ti/Eu or Yb/Er were prepared. The crystal structure and downconversion luminescence properties of CaAlZnO:Ti, Eu phosphors were studied in detail. Ti and Eu occupied Al and Ca sites in the host lattice, respectively. Under the excitation of 273 nm, the emission peak in the 300-570 nm band originated from the T → O transition of Ti. The f-f transition of Eu ions generated multiple peaks in the 570-800 nm range. The emission intensity of Ti and Eu ions can be used as a fluorescence intensity ratio (FIR) signal. Based on the FIR technology, the maximum relative sensitivity () and the minimum temperature uncertainty (δ) reached 1.41% K and 0.07 K, respectively. Meanwhile, the temperature-sensing behaviors were explored by the temperature-dependent upconversion spectra of Er- and Yb-codoped CaAlZnO phosphors. Based on the fluorescence intensity ratio of thermal coupling levels (Er:H/S), the maximum and minimum δ of upconversion phosphors reached 1.28% K and 0.08 K in the temperature range of 293-473 K, respectively. CaAlZnO:Ti/Eu (Yb/Er) phosphors realize temperature sensors with higher relative sensitivity, and it is a good candidate material for optical temperature measurement.
制备了共掺杂Ti/Eu或Yb/Er的下转换/上转换CaAlZnO无机磷光体。详细研究了CaAlZnO:Ti, Eu磷光体的晶体结构和下转换发光特性。Ti和Eu分别占据主体晶格中的Al和Ca位点。在273 nm激发下，300 - 570 nm波段的发射峰源于Ti的T→O跃迁。Eu离子的f - f跃迁在570 - 800 nm范围内产生多个峰。Ti和Eu离子的发射强度可作为荧光强度比（FIR）信号。基于FIR技术，最大相对灵敏度（）和最小温度不确定度（δ）分别达到1.41% K和0.07 K。同时，通过Er和Yb共掺杂CaAlZnO磷光体的温度依赖上转换光谱研究了温度传感行为。基于热耦合能级（Er:H/S）的荧光强度比，上转换磷光体在293 - 473 K温度范围内的最大和最小δ分别达到1.28% K和0.08 K。CaAlZnO:Ti/Eu（Yb/Er）磷光体实现了具有较高相对灵敏度的温度传感器，是光学温度测量的良好候选材料。
