La_(2)Ce_(2)O_(7):Ho^(3+)/Yb^(3)陶瓷的荧光温度传感性能研究

Fluorescence temperature sensing performance of La2Ce2O7∶Ho3+/Yb3+ceramics

为研究La_(2)Ce_(2)O_(7):Ho^(3+)/Yb^(3+)陶瓷的荧光温度传感性能,采用高温固相反应法制备该材料,在La_(2)Ce_(2)O_(7)晶格中,使Ho^(3+)和Yb^(3+)都取代La^(3+)的位置,其中,Ho^(3+)离子浓度为0.05%at.%,Yb^(3+)离子浓度在10%~18%at.%范围内。在980 nm波长的激光激发下,检测到上转换(Up-conversion,UC)绿光的强度在550 nm处达到峰值,红光强度在666 nm处达到峰值。当Ho^(3+)和Yb^(3+)的掺杂浓度分别为0.05%at.%和14%at.%时,UC发射强度最强。研究了La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)陶瓷在303~483 K温度范围内的温度传感性能,在303 K温度条件下得到最高绝对灵敏度(Sa)为0.0028 K^(-1),在303 K温度条件下得到最高相对灵敏度(Sr)为0.0054 K^(-1),表明La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)陶瓷可以作为潜在的远程温度传感器候选材料。

La_(2)Ce_(2)O_(7)ceramics co⁃activated by Ho^(3+)and Yb^(3+)were synthesized by high temperature solid⁃state reac⁃tion.Both Ho^(3+)and Yb^(3+)substitute the La^(3+)sites in the La_(2)Ce_(2)O_(7)lattice,where the Ho^(3+)concentration is 0.05%at.%and the Yb^(3+)concentration varies in the range of 10%~18%at.%.Pumped by a 980 nm laser,the up⁃conversion(UC)green emission peaked at 550 nm and the red emission at 666 nm were detected.When the doping concentration of Ho^(3+)and Yb^(3+)are 0.05%at.%and 14%at.%,respectively,the UC emission reaches the strongest intensity.Temperature sensing performance of La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)was studied in the temperature range of 303~483 K,the highest absolute sensitivity(Sa)is 0.0028 K^(-1)at 303 K and the highest relative sensitivity(Sr)is 0.0054 K^(-1)at 303 K.The results show that the ce⁃ramics La_(2)Ce_(2)O_(7)∶Ho^(3+)/Yb^(3+)can be a potential candidate for remote temperature sensors.