Cr^(3+)掺杂Y_(3)Al_(5)O_(12)-Al_(2)O_(3)的光致发光和温度传感特性研究  

esearch on photoluminescence and temperature sensing properties of Cr^(3+)doped Y_(3)Al_(5)O_(12)-Al_(2)O_(3)

作　　者：徐伟 姚淼 XU Wei;YAO Miao(School of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《燕山大学学报》2024年第2期171-180,共10页Journal of Yanshan University

基　　金：国家自然科学基金资助项目(62175208,12204401)。

摘　　要：为了开发具有高发光效率和高测温灵敏度的光学温度传感材料,采用高温固相法合成了一系列Cr^(3+)掺杂Y_(3)Al_(5)O_(12)-xAl_(2)O_(3)(x=0,0.5,1.25,2,2.75,3.5)固熔体。利用X射线衍射、扫描电子显微镜、傅里叶红外光谱、稳态激发和发射光谱表征,详细研究了Y_(3)Al_(5)O_(12)中Al_(2)O_(3)的掺杂浓度对其结构和发光性能的影响。研究表明,提高Al_(2)O_(3)掺杂量可以增加固熔体中的八面体配位,同时削弱了晶体场强度,有利于Cr^(3+)的发光。在303~773 K温度范围内,利用该材料中Cr^(3+)荧光寿命以及热耦合能级荧光强度比的温度依赖特性进行测温研究,两种方法的相对测温灵敏度分别在500 K时达到最大值0.802%K^(-1),在303 K时达到最大值0.977%K^(-1)。除此之外,本文首次提出利用激光强度与荧光强度之比作为测温参数的比率型测温方法,在773 K时取得最大相对测温灵敏度为1.036%K^(-1)。上述研究结果表明,Cr^(3+)掺杂Y_(3)Al_(5)O_(12)-xAl_(2)O_(3)固熔体材料具有良好的光学温度传感特性,三种不同模式的测温方法为该材料在发光测温领域的应用提供了广阔的前景。In order to develop optical temperature sensing materials with high luminescence efficiency and excellent temperature sensitivity,a series of Cr^(3+) doped Y_(3)Al_(5)O_(12)-xAl_(2)O_(3)(x=0,0.5,1.25,2,2.75,3.5)solid solutions were synthesized by high temperature solid phase method.The influence of doping concentration of Al_(2)O_(3) in Y_(3)Al_(5)O_(12) on the structure and luminescent characterization were studied in detail by the X-ray diffraction patterns,scanning electron microscope,FT-IR spectra,steady-state excitation and emission spectra.Research revealed that the increase of Al_(2)O_(3) doping content could increase the octahedral coordination in solid solutions and simultaneously weaken the crystal field strength,favoring the luminescence of Cr^(3+).Temperature sensing research was conducted using the temperature-dependent characteristics of the Cr^(3+) fluorescence lifetime and the thermal coupling energy level fluorescence intensity ratio in this material within the temperature range of 303 K to 773 K.The relative temperature sensitivities of the two methods reached a maximum value of 0.802% K^(-1)at 500 K and 0.977% K^(-1) at 303 K,respectively.In addition,a ratio-type temperature measurement method using the ratio of laser intensity to fluorescence intensity as the temperature measurement parameter is proposed for the first time in this study,achieving a maximum relative temperature sensitivity of 1.036%K^(-1)at 773 K.These research results indicate that the Cr^(3+) doped Y_(3)Al_(5)O_(12)-xAl_(2)O_(3) solid solutions have excellent optical temperature sensing characteristics,and the three different temperature measurement methods provide broad prospects for the application of this material in the field of luminescent temperature sensing.

关 键 词：光谱测量 Cr^(3+)离子 固熔体 光致发光 光学温度传感 

分 类 号：O433.1[机械工程—光学工程]