Multi‐phase glass‐ceramics containing CaF 2 : Er 3+ and ZnAl 2 O 4 :Cr 3+ nanocrystals for optical temperature sensing
Multi‐phase glass‐ceramics containing CaF 2 : Er 3+ and ZnAl 2 O 4 :Cr 3+ nanocrystals for optical temperature sensing
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DOI：
10.1111/jace.16098
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发表时间：
2018-10
影响因子：
3.9
通讯作者：
Abhishek Wadhwa;Changjian Wang;Chenhao Wang;R. Ma;X. Qiao;X. Fan;G. Qian
中科院分区：
文献类型：
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作者：
Abhishek Wadhwa;Changjian Wang;Chenhao Wang;R. Ma;X. Qiao;X. Fan;G. Qian
采用熔体淬冷法制备了含CaF 2和ZnAl 2 O 4纳米晶的氟氧化物透明微晶玻璃（GC）。通过对前驱体玻璃（PG）进行热处理，Er 3+和Cr 3+分别被选择性地分配到CaF 2和ZnAl 2 O 4纳米晶中。所获得的多相GC表现出Er 3+的强上转换（UC）荧光以及Cr 3+的强下转换（DC）荧光。在980 nm激发下，Er ~（3+）的~ 2 H ~（11/2），~ 4S ~（3/2）→ ~ 4 I ~（15/2）跃迁的绿色UC荧光和Cr ~（3+）的~ 2 E，~ 4 T ~ 2 → ~ 4A ~ 2跃迁的红色DC荧光寿命与温度有很强的依赖关系，这使它们可能适用于光学测温。采用最小二乘拟合方法，来自热耦合能态（2 H11/2和4S 3/2）的Er 3+的FIR分别在437 K和267 K时产生最大温度传感灵敏度值0.33% K− 1和0.36% K− 1。类似地，归因于宇称禁止（2 E → 4A 2）和自旋允许（4 T2 → 4A 2）的Cr 3+的荧光寿命在535 K时产生最大温度传感器灵敏度值等于0.67%K − 1。
Oxyfluoride transparent glass‐ceramics (GC) containing CaF2and ZnAl2O4nanocrystals have been fabricated with melt‐quenching method. By carrying out the heat treatment of the precursor glass (PG), Er3+and Cr3+were selectively partitioned into CaF2and ZnAl2O4nanocrystals, respectively. The obtained multi‐phase GC exhibited strong upconversion (UC) fluorescence of Er3+as well as intense down‐conversion (DC) fluorescence of Cr3+. Under 980 nm excitation, the green UC fluorescence of Er3+due to2H11/2,4S3/2→4I15/2transition and the red DC fluorescence lifetime of Cr3+due to2E,4T2→4A2transition were found to be highly dependent on the temperature and makes them possibly suitable for Optical Thermometry. With least‐square fitting methods, the FIR of Er3+from thermally coupled energy states (2H11/2and4S3/2) produced maximum temperature sensing sensitivity values of 0.33% K−1at 437 K and 0.36% K−1at 267 K, respectively. Similarly, fluorescence lifetime of Cr3+attributed to the parity forbidden (2E →4A2) and spin allowed (4T2→4A2) produced the maximum temperature sensor sensitivity value equal to 0.67% K−1at 535 K.