长余辉荧光粉Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)的制备与发光性能  

Preparation and Luminescence Properties of Long-persistent Phosphor Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)

作　　者：曾巍 陈欣 陈文潇 苟彩祥 钱士业 王吉乐 秦宇鑫 ZENG Wei;CHEN Xin;CHEN Wenxiao;GOU Caixiang;QIAN Shiye;WANG Jile;QIN Yuxin(Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education,Key Laboratory of Polymer Materials of Gansu Province,College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学生态功能高分子材料教育部重点实验室,甘肃省高分子材料重点实验室,化学化工学院,甘肃兰州730070

出　　处：《发光学报》2024年第12期1984-1991,共8页Chinese Journal of Luminescence

基　　金：甘肃省自然科学基金(20JR5RA513);西北师范大学青年教师科研能力提升计划(NWNU-LKQN2021-10)。

摘　　要：采用高温固相法合成Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)蓝色长余辉荧光粉,通过X射线衍射、激发发射光谱、余辉衰减曲线、余辉光谱和热释光光谱等手段,对荧光粉进行了结构和发光性能表征。结果表明,在347 nm的紫外光激发下,Eu^(2+)单掺杂和Eu^(2+)、Ln^(3+)共掺杂的荧光粉都发出明亮的蓝光,发射光谱显示其具有2个明显的峰值,分别位于440 nm和500 nm,属于Eu^(2+)在不同格位的特征发射(4f^(6)5d1-4f^(7))。镧系离子掺入后在带隙中会产生杂化能级,引入不同深度的陷阱,对材料的余辉性能都有不同程度的提高。其中,Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)样品的性能最佳,其余辉时间超过12 h。Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)样品与单掺杂样品相比初始亮度提高了12倍。Dy^(3+)的掺入有效提高了样品中深陷阱(T_(2))的浓度,有望用于光学数据存储。Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ln^(3+)blue long-persistent phosphors were synthesized by high-temperature solid-state method and their structure and luminescence properties were characterized by means of X-ray diffraction,excita-tion and emission spectroscopy,afterglow decay curves,afterglow spectroscopy and thermoluminescence.The re-sults showed that under the excitation of UV light at 347 nm,both Eu^(2+)single-doped and Eu^(2+),Ln^(3+)co-doped phos-phors emit bright blue light,and the emission spectra showed that they have two obvious peaks located at 440 nm and 500 nm,which belong to the characteristic emission of Eu^(2+)at different lattice positions(4f^(6)5d1-4f^(7)).The in-corporation of Ln^(3+)introduced hybrid energy levels within the bandgap,resulting in traps of varying depths,which enhanced the afterglow performance of the material to different extents.Among them,the Ba_(5)SiO_(4)Cl_(6)∶Eu^(2+),Ho^(3+)samples showed the best performance with an afterglow time of more than 12 h.The Ba5SiO4Cl6∶Eu^(2+),Er^(3+)samples showed a 12-fold increase in the initial brightness compared to the singly doped samples.The doping of Dy^(3+)effec-tively increased the concentration of the deep traps(T_(2))in the sample,which was expected to be used for optical data storage.

关 键 词：长余辉荧光粉 Eu^(2+)掺杂 镧系元素 热释光 

分 类 号：O482.31[理学—固体物理]