Si,Lu掺杂Ca_(0.8)Zn_(0.2)TiO_3∶Pr^(3+)荧光粉的光学性能改善  

Improved Luminescence Properties of Ca_(0.8)Zn_(0.2)TiO_3∶Pr^(3+) Phosphors Doped with Si and Lu

作　　者：李金银 彭志雄 余丽萍 周文理 邱忠贤 李承志 廉世勋 LI Jin-yin, PENG Zhi-xiong, YU Li-ping,ZHANG Ji-lin, ZHOU Wen-li,QIU Zhong-xian, LI Cheng-zhi, LIAN Shi-xun(Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province,College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, Chin)

机构地区：[1]湖南师范大学化学化工学院资源精细化与先进材料湖南省高校重点实验室,湖南长沙410081

出　　处：《发光学报》2018年第5期643-652,共10页Chinese Journal of Luminescence

基　　金：国家自然科学基金(21471055);湖南省自然科学基金(12JJ2029)资助项目~~

摘　　要：采用高温固相法合成Ca_(0.8)Zn_(0.2)TiO_3∶0.2%Pr^(3+),Si^(4+)和Ca_(0.8)Zn_(0.2)TiO_3∶0.2%Pr^(3+),Si^(4+),Lu^(3+)荧光粉。通过X射线衍射仪、电子顺磁共振光谱仪、显微拉曼光谱仪和荧光光谱仪等表征了该系列荧光粉的物相组成、微观结构和发光性质。结果表明,以β-Si_3N_4为硅源制备的荧光粉具有最佳的光学性能。加入ZnO后,荧光粉由CaTiO_3、Zn_2TiO_4和Ca_2Zn_4Ti_(16)O_(38)三相组成,其中CaTiO_3为主相。电子顺磁共振谱证实了Pr^(4+)存在,Lu^(3+)的添加使[Pr^(4+)Ti^(3+)O_3]^+簇显著增加,电子顺磁共振谱和拉曼光谱均证实Si^(4+)、Lu^(3+)的掺杂使局部TiO_6簇对称性提高,有利于Pr^(3+)发光中心的能量传递。在336nm激发下,荧光粉展示了很强的位于612nm的红光发射(归属于Pr^(3+)的~1D_2→~3H_4跃迁)及理想的红光色坐标(x=0.670,y=0.330)。Si^(4+)和Lu^(3+)的添加显著增强了370nm激发下红光发射,Ca_(0.8)Zn_(0.2)TiO_3∶0.2%Pr^(3+),3.2%Si^(4+)荧光粉的余辉寿命最长。Ca0.8Zn0.2TiO3∶ 0. 2% Pr3＋,Si4＋and Ca0.8Zn0.2TiO3∶ 0. 2% Pr3＋,Si4＋,Lu3＋phosphors were synthesized by high temperature solid-state method. Crystalline phase,microstructure and luminescence properties of phosphors were characterized with X-ray diffractometer（ XRD）,electron paramagnetic resonance spectrometer（ EPR）,microscopic Raman spectrometer and photoluminescence spectrometer,respectively. The results show that phosphor prepared using β-Si3N4 as Si source has the optimal luminescence properties. Phosphors with the addition of Zn O were confirmed to be constituted of Ca TiO3,Zn2 TiO4 and Ca2Zn4Ti16O38,and Ca TiO3 is major phase. EPR spectra confirm that the presence of Pr4＋and [Pr4＋Ti3＋O3]＋ clusters remarkably increase with the Lu3＋addition. Increasing local symmetry of TiO6 clusters with the addition of Si4＋and Lu3＋is verified by EPR and Raman spectra,which is beneficial for the energy transfer of luminescent center Pr3＋. The obtained phosphor exhibited the intense red emission centered at 612 nm（ originated from 1D2→3H4 transition of Pr3＋） with an ideal chromaticity coordinate located at（ x = 0. 670,y =0. 330） under 336 nm excitation. Red emission excited by 370 nm remarkably increases with the addition of Si4＋and Lu3＋.The synthetic Ca0.8Zn0.2TiO3∶ 0. 2% Pr3＋,3.2%Si4＋phosphor has the longest average lifetime.

关 键 词：Ca0.8Zn0.2TiO3∶Pr^3+ Β-SI3N4 Lu^3+掺杂 红色长余辉 

分 类 号：O482.31[理学—固体物理]