稀土铕掺杂钒酸钇的荧光温度特性研究  

Investigation on Fluorescence Temperature Properties of Eu3+-doped YVO4 Phosphors

作　　者：周红 高文海 张渤琦 李霜[1] ZHOU Hong;GAO Wen-hai;ZHANG Bo-qi;LI Shuang(School of Science,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学理学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2021年第1期7-13,共7页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：吉林省教育厅“十三五”科学技术项目(JJKH20190552KJ)。

摘　　要：采用水热法制备了四方相YVO4:Eu^3+纳米荧光粉,研究了YVO4:Eu^3+晶体结构、发光特性及荧光温度特性。XRD结果表明合成的YVO4:Eu^3+荧光粉与基质YVO4的晶相结构一致。发光光谱表明,在398 nm激发下显示了Eu^3+离子的4f-4f特征跃迁红光发射。在303~623 K温度区间,发光峰位没有发生变化,各特征峰强度均显示出温度依赖性。采用荧光强度比技术,分别基于热耦合能级到相同基态的跃迁(^5D1→^7F1和^5D0→^7F1)、热耦合能级到不同基态的跃迁(^5D1→^7F1和^5D0→^7F4)及到Stark能级(^5D0→^7F4(1)和^5D0→^7F4(2))跃迁,研究其荧光温度特性。结果表明,在623 K时基于热耦合能级到相同基态跃迁(^5D1→^7F1和^5D0→^7F1)可获得最大测温灵敏度为2.55×10^-3 K^-1,大于基于热耦合能级到不同基态能级(^5D1→^7F1和^5D0→^7F4)时获得的最大灵敏度为1.08×10-3 K-1;而基于热耦合能级到Stark能级跃迁(^5D0→^7F4(1)和^5D0→^7F4(2))可在303 K时获得最大灵敏度为5.03×10^-4 K^-1。说明基于热耦合能级荧光强度比技术更适合用于高温条件,测温灵敏度决定于热耦合能级差,与到达基态能级无关。而低温条件下,基于Stark能级荧光强度比可获得较高的测温灵敏度,测温灵敏度决定于Stark能级差。In this paper,the tetragonal phase Eu^3+-doped YVO4 nanophosphors were prepared byhydrothermal methods.The crystal structure,luminescence properties and temperature sensing characteristics of YVO4:Eu^3+phosphors were studied,r espectively.The XRDresults showed that the crystal phase structure of YVO4:Eu^3+sampleswere consistent with the hostYVO 4.The luminescence spectra showed that the 4f-4f characteristic transition red light emission of Eu^3+ion under the excitation of 398 nm.The emission peak position of the YVO4:Eu^3+sample did not change in the range of 303 K~623 K temperature and all the characteristic peaks showed temperature dependence.Using fluorescence intensity ratio techniques,based on thermal coupling energy levels to the same ground state transitions(^5D1→^7F1 and^5D0→^7F1),thermal coupling energy levels to different ground state transitions(^5D1→^7F1 and^5D0→^7F4)and to Stark energy levels(^5D1→^7F4(1)and^5D0→^7F4(2))transitions,investigated their fluorescence temperature characteristics.The results showedthat the maximum sensitivity can be obtained at 623 K is 2.55×10-3 K-1 based on fluorescence intensity ratios of^5D1→^7F1 and^5D0→^7F1,which is greater thanthe maximum sensitivity of 1.0^8×10^-3 K-1based on fluorescence intensity ratios of^5D1→^7F1 and^5D0→^7F4.Meanwhile,the maximum sensitivity is 5.03×10^-4 K^-1 based on fluorescence intensity ratios of^5D1→^7F4(1)and^5D0→^7F4(2)can be obtained at 303 K.It was indicated that the fluorescence intensity ratio based on the thermal coupling level is more suitable for high temperature conditions.The sensitivity of the temperature measurement was determined by the thermal coupling level difference,i ndependent of the ground state energy level.And at low temperature,higher temperature sensitivity can be obtained based on the Stark level fluorescence intensity ratio.

关 键 词：YVO4:Eu^3+ 热耦合能级 Stark能级 荧光温度特性 

分 类 号：O469[理学—凝聚态物理]