Ce^(3+)、Cr^(3+)掺杂宽带近红外发光材料Y_(2)CaAl_(4)SiO_(12)的发光性能以及能量传递  

Luminescence Properties and Energy Transfer of Ce^(3+),Cr^(3+)Doped Wideband Near-Infrared Luminescent Material Y_(2)CaAl_(4)SiO_(12)

作　　者：米晓云 刘宇洁[2] 汪德岩 董雅玲 刘秀玲 王艳平 MI Xiaoyun;LIU Yujie;WANG Deyan;DONG Yaling;LIU Xiulin;WANG Yanping(Research Institute of Changchun University of Science and Technology in Chongqing,Chongqing 401120,China;School of Materials Science and Engineering,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学重庆研究院,重庆401120 [2]长春理工大学材料科学与工程学院,长春130022

出　　处：《硅酸盐学报》2024年第12期3728-3736,共9页Journal of The Chinese Ceramic Society

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1001,cstc2021jcyj-msxmX0936,cstc2021jcyj-msxmX0930)。

摘　　要：发射波长范围在700~1100 nm的近红外发光因其可在无损检测、生物识别、夜视等领域发挥重要作用而倍受到关注。采用高温固相法合成了Cr^(3+)单掺以及Ce^(3+)、Cr^(3+)共掺的Y_(2)CaAl_(4)SiO_(12)发光材料。在438 nm光激发下,Cr^(3+)可以产生位于740 nm的近红外宽带发射以及690 nm的R线窄带发射。测量出单掺Cr^(3+)的量子效率为24%,且通过激发光谱分析计算得出晶体场强度为2.429。通过变温光谱分析Y_(2)CaAl_(4)SiO_(12):Cr^(3+)的热稳定性,在150℃的发光强度可以达到初始强度的77.6%。在此基础上制备Y_(2)Ca Al_(4)SiO_(12):Ce^(3+),Cr^(3+)发光材料,存在Ce^(3+)到Cr^(3+)的能量传递,其能量传递机制为四极–四极作用,且Y_(2)CaAl_(4)SiO_(12):0.005Ce^(3+),0.007Cr^(3+)的发光强度约为单掺Cr^(3+)样品的3倍,同时测出共掺样品的量子效率为45%。Introduction Near-infrared(NIR)luminescence with emission wavelengths ranging from 700 nm to 1100 nm has attracted much attention in the fields of nondestructive testing,biometrics,and night vision.In this paper,high-temperature solid-phase method was used to synthesize Cr^(3+)single-doped and Ce^(3+),Cr^(3+)co-doped Y_(2)Ca Al_(4)SiO_(12)luminescent materials.Under 438 nm light excitation,Cr^(3+)could produce a near-infrared broadband emission at 740 nm and R-line narrowband emission at 690 nm.The quantum efficiency of mono-doped Cr^(3+)was calculated to be 24%,and the crystal field intensity was calculated to be 2.429 by excitation spectral analysis.The thermal stability and the luminescence intensity of Y_(2)CaAl_(4)SiO_(12):Cr^(3+)were analyzed by variable-temperature spectroscopy.In addition,Y_(2)CaAl_(4)SiO_(12):Ce^(3+),Cr^(3+)luminescent materials were also prepared,and the luminescence intensity and the quantum luminescence efficiency of Y_(2)Ca Al_(4)SiO_(12):0.005Ce^(3+),0.007Cr^(3+)were analyzed.Methods In accordance with the stoichiometric ratios,Y_(2–x)CaAl_(4)SiO_(12):xCe^(3+)(where x=0.001–0.011 mol)and Y_(2)CaAl_(4–y)SiO_(12):0.005 Ce^(3+),yCr^(3+)(where y=0.001–0.011 mol)were prepared via solid-state reactions with raw materials of CaCO_(3),Cr_2O_(3),CeO_(2),Al_(2)O_(3),SiO_(2),and Y_(2)O_(3).The mixture with anhydrous ethanol was then ground in a mortar.Subsequently,the ground material was dried in an oven at 80℃before being transferred to a square crucible for sintering in a reducing atmosphere at 1550℃for 4 h.Afterwards,the sample was removed and allowed to cool to room temperature for the coming analysis.Results and discussion Y_(2)CaAl_(4)SiO_(12):Cr^(3+)belongs to a cubic structure,the space group is Ia3d,the number of molecules Z=8.The optimal doping concentration of Y_(2)CaAl_(4–y)SiO_(12):yCr^(3+)(y=0–0.01)is 0.007,and the quenching mechanism of concentration is dipole-dipole interaction.After co-doping of Cr^(3+)and Ce^(3+)(Cr^(3+)is 0.007),the luminescence intensity is

关 键 词：铬离子 石榴石 近红外发光 能量传递 

分 类 号：O482.31[理学—固体物理]