Dy^(3+)掺杂SrAl_(2)O_(4)∶Tb 3+余辉发光荧光粉余辉性能优化  

Afterglow Performance Optimization of Dy^(3+)Doped SrAl_(2)O_(4)∶Tb^(3+)Afterglow Luminescent Phosphors

作　　者：舒建 李胜男 姜义 贾振国 SHU Jian;LI Shengnan;JIANG Yi;JIA Zhenguo(School of Energy and Power Engineering,Changchun Institute of Technology,Changchun 130024,China)

机构地区：[1]长春工程学院能源动力工程学院,长春130024

出　　处：《人工晶体学报》2025年第4期652-662,共11页Journal of Synthetic Crystals

基　　金：吉林省科技厅自然科学基金(YDZJ202201ZYTS321);吉林省教育厅优秀青年基金(JJKH20240779KJ)。

摘　　要：通过高温固相法在空气气氛下合成了SrAl_(2)O_(4)∶x%Tb^(3+)(SAO∶Tb,x=0.3,0.5,1.0,2.0,3.0)、SrAl_(2)O_(4)∶1.0%Tb^(3+),y%Dy^(3+)(SAO∶Tb/Dy,y=0,0.5,1.0,3.0,5.0)系列余辉发光材料。XRD图谱和SEM照片显示已经获得纯相系列样品。SAO∶Tb的激发光谱、发射光谱及余辉衰减曲线证明当Tb^(3+)掺杂浓度为x=1.0时余辉性能最佳。在SrAl_(2)O_(4)∶1.0%Tb^(3+)基础上进行了Dy^(3+)共掺杂实验,样品具有更好的余辉性能。SAO∶Tb/Dy系列样品的激发和发射光谱强度变化说明在此材料中可能存在能量传递(ET)过程。余辉衰减曲线进一步验证了Dy^(3+)共掺杂后,材料的陷阱数目增多。对比共掺杂Dy^(3+)的热释发光曲线强度进一步说明了材料中陷阱数目由于Dy^(3+)的掺入而增加,同时,共掺Dy^(3+)后,陷阱1和陷阱2的能级差缩小,从而更易释放更多电子。通过对灯具表面温度分析,结合热释发光曲线,Dy^(3+)掺入后,SAO∶Tb荧光粉陷阱2的电子释放温度由117℃减小到97℃,使其所有被俘获的电子均能依靠吸收灯具热量释放,从而将部分热辐射转换为可见光,因此,SAO∶Tb/Dy荧光粉不仅在制备方面可脱离还原气氛,在降低照明能耗、减小灯源热辐射方面也有潜在应用价值。SrAl_(2)O_(4)∶x%Tb^(3+)(SAO∶Tb,x=0.3,0.5,1.0,2.0,3.0),SrAl_(2)O_(4)∶1.0%Tb^(3+),y%Dy^(3+)(SAO∶Tb/Dy,y=0,0.5,1.0,3.0,5.0)series of residual luminescent materials were synthesized by high temperature solid phase method under air atmosphere.XRD patterns and SEM images show that the SAO∶Tb and SAO∶Tb/Dy samples are all pure phase.The excitation spectrum,emission spectrum and afterglow attenuation curves of SAO∶Tb show that the afterglow performance are best when the doping concentration of Tb^(3+)is x=1.0.Dy^(3+)co-doping experiments were carried out on SrAl_(2)O_(4)∶1.0%Tb^(3+),the sample with the better afterglow performance.The excitation and emission spectra intensities of SAO∶Tb/Dy series samples indicate that there may be exist energy transfer(ET)processes in SAO∶Tb/Dy phosphors.The afterglow attenuation curves further verify that the number of traps increase after Dy^(3+)co-doping.Comparision with thermoluminescence curves intensities between SAO∶Tb and SAO∶Tb/Dy indicate that the number of traps in this material increases due to the inclusion of Dy^(3+),at the same time,after co-doping with Dy^(3+),the energy range between trap 1 and trap 2 is reduced,which makes it easier to release more electrons.Combined with the thermos luminescence curve and the luminaire surface temperature,the electron release temperature of SAO∶Tb phosphor trap 2 decrease from 117℃to 97℃while Dy^(3+)are incorporated,so that all the trapped electrons can released rely on the heat from the luminaire,thereby converting some of the thermal radiation into visible light,therefore,the SAO∶Tb/Dy phosphors are not only free from the reducing atmosphere in preparation process,but also have potential application value in reducing lighting energy consumption and reducing the thermal radiation of lamp source.

关 键 词：荧光粉 光致发光 Tb^(3+)掺杂 Dy^(3+)掺杂 长余辉 余辉机理模型 

分 类 号：O734[理学—晶体学]