具有双钙钛矿结构的Ca_(2)GdSbO_(6):Er^(3+)荧光粉的光致发光及其温敏特性研究  

Photoluminescence and thermal sensitivity properties of double perovskite structure Ca_(2)GdSbO_(6):Er^(3+)pphosphors

作　　者：金煜浛 田莲花[1] JIN Yuhan;TIAN Lianhua(College of Science,Yanbian University,Yanji 133002,China)

机构地区：[1]延边大学理学学院,吉林延吉133002

出　　处：《延边大学学报(自然科学版)》2025年第1期25-31,共7页Journal of Yanbian University(Natural Science Edition)

摘　　要：采用高温固相法制备了Ca_(2)Gd_(1-x)SbO_(6):xEr^(3+)荧光粉,并利用常温激发、发射光谱和变温发射光谱对其光谱性能以及温度敏感性进行了研究.研究表明:Ca_(2)GdSbO_(6):Er^(3+)荧光粉在379nm激发下产生较强的绿色发射和较弱的红色发射,分别对应Er^(3+)的^(2)H_(11/2)/^(4)S_(3/2)→^(4)I_(15/2)跃迁以及^(4)F_(9/2)→^(4)I_(15/2)跃迁.光致发光强度(PLE)与Er^(3+)离子的掺杂含量有关,当Er^(3+)的掺杂含量为0.07时,样品的光致发光强度达到最大值.浓度猝灭机制主要为最近邻离子相互作用,其临界距离为1.504nm.基于^(2)H_(11/2)和^(4)S_(3/2)这两处热耦合能级发射强度随温度的变化研究了样品的温度敏感性,当温度达到480K时^(2)H_(11/2)和^(4)S_(3/2)能级的发射强度分别为室温下的1.34倍和33%.样品的最大绝对灵敏度为0.009K^(-1),最大相对灵敏度为1.40%K^(-1).上述结果说明Ca_(2)GdSbO_(6):Er^(3+)荧光粉有潜力应用于荧光测温领域.Ca_(2)Gd_(1-x)SbO_(6):xEr^(3+)phosphor were prepared by high temperature solid state reaction.Its luminescence and temperature sensing properties were studied by room temperature excitation and emission spectra and temperature-dependent emission spectra,Research shows that the Ca_(2)GdSbO_(6):Er^(3+)phosphor generates strong green emission and weak red emission under 379 nm excitation,are attributed to the energy level transitions of Er^(3+)at^(2)H_(11/2)/^(4)S_(3/2)→^(4)I_(15/2)and^(4)F_(9/2)→^(4)I_(15/2),respectively.The photoluminescence emission(PLE)intensity is found to be dependent on the Er^(3+)ions concentration and its maximum value is achieved when the doping concen-tration is O.07.The concentration quenching mechanism is dominated by the electric nearest neighbor ion interaction,with a critical distance of 1.504 nm.The temperature sensing performance for the samples was studied based on the change of emission intensities from two thermally coupled^(2)H_(11/2)and^(4)S_(3/2)levels of Er^(3+),When the temperature reaches 480 K,the emission intensities of the^(2)H_(11/2)and^(4)S_(3/2)energy levels are 1.34 times and 33%of that at room temperature,respectively.The maximum absolute sensitivity of the sample was calculated to be 0.009 K^(-1),and the maximum relative sensitivity was 1.40%K^(-1),The results indicated that Ca_(2)GdSbO_(6):Er^(3+)phosphor have good application potential in fluorescence thermometry field.

关 键 词：双钙钛矿 Er^(3+) 荧光粉 荧光测温 荧光强度比 

分 类 号：O482.31[理学—固体物理]