Tb^(3+)掺杂钒磷酸盐蓝绿发光调控及发光机理研究  

Study on Tunable Blue-Green Luminescence and Mechanism of Tb^(3+) Doped Vanadium Phosphate

作　　者：张守超 高森单 刘洪飞 姜荣云 王翠红 聂晓菊 张丽文 覃冰 ZHANG Shouchao;GAO Sendan;LIU Hongfei;JIANG Rongyun;WANG Cuihong;NIE Xiaoju;ZHANG Liwen;QIN Bing(School of Science,Tianjin Chengjian University,Tianjin 300384,China;Zolix Instruments Co.,Ltd.,Beijing 101102,China)

机构地区：[1]天津城建大学理学院,天津300384 [2]北京卓立汉光仪器有限公司,北京101102

出　　处：《人工晶体学报》2024年第8期1422-1433,共12页Journal of Synthetic Crystals

基　　金：国家自然科学基金(12104338);天津市研究生科研创新项目(2022SKYZ135)。

摘　　要：本文采用高温固相方法合成了不同掺杂浓度的YVO_(4)∶Tb^(3+)、YPO_(4)∶Tb^(3+)和YV_(1-x)P_(x)O_(4)∶Tb^(3+)系列荧光粉,利用差示扫描量热法(DSC)分析了高温固相合成过程中的化学反应,确定将1 350℃作为高温合成温度。利用XRD表征了材料物相结构,结果显示材料物相单一,均为四方晶系结构。研究了YVO_(4)∶Tb^(3+)、YPO_(4)∶Tb^(3+)和YV_(1-x)P_(x)O_(4)∶Tb^(3+)系列荧光粉室温下的发光性质。受晶体场影响,紫外激发下YVO_(4)∶Tb^(3+)中Tb^(3+)发光主要以^(5)D_(3)→^(7)F_(J)(J=6,5,4,2)跃迁发光为主,发光显示为蓝光;P元素的增加改变了YV_(1-x)P_(x)O_(4)∶Tb^(3+)晶体场环境,增强了基质与^(5)D_(3)、^(5)D_(4)能级间的多声子弛豫及^(5)D_(3)→^(5)D_(4)能级间的交叉弛豫,^(5)D_(4)→^(7)F_(J′)(J′=6,5,4,3)发射逐渐占优,发光呈现蓝、青、绿发光变化;掺杂浓度对YPO_(4)∶Tb^(3+)发光调控作用显著,随着掺杂浓度增加,Tb^(3+)的^(5)D_(3)与^(5)D_(4)能级间的交叉弛豫作用增强,^(5)D_(3)发光减弱,^(5)D_(4)发光增强,通过调整掺杂浓度实现材料发光由青光到绿光的调控。综上,通过基质组分及掺杂浓度调节,可实现Tb^(3+)掺杂钒磷酸盐体系蓝绿发光调控。YVO_(4),YPO_(4) and YV_(1-x)P_(x)O_(4) phosphors with various Tb^(3+) doping concentrations were prepared by high-temperature solid-state method.Differential scanning calorimetry(DSC) measurements were conducted to evaluate the chemical reactions during synthesis process,determining 1 350 ℃ as the optimal synthesis temperature.X-ray diffraction(XRD) analysis of the synthesized materials confirmed a tetragonal crystal structure for all samples.The luminescent properties of the mentioned phosphors at room temperature were investigated.Under ultraviolet excitation,luminescence in YVO_(4)∶Tb^(3+) predominantly arises from the ^(5)D_(3)→^(7)F_(J)(J=6,5,4,2) transitions,resulting in blue emission.The introduction of P element modified the crystal field environment in YV_(1-x)P_xO_(4)∶Tb^(3+),enhancing multi-phonon relaxation(MPR) and cross-relaxation(CR) between ^(5)D_(3) and ^(5)D_(4) energy levels.With increasing P element content,the emission gradually shifted towards ^(5)D_(4)→^(7)F_(J′)(J′=6,5,4,3),displaying blue,cyan,and green emissions.In YPO_(4)∶Tb^(3+),higher doping concentrations enhanced cross relaxation between ^(5)D_(3) and ^(5)D_(4) energy levels of Tb^(3+),leading to weakened ^(5)D_(3) luminescence and intensified ^(5)D_(4) luminescence.Fine-tuning the doping concentration enabled the control of luminescence from blue to green.In conclusion,by adjusting the matrix composition and doping concentration,the blue-green luminescence modulation of Tb^(3+)-doped vanadium phosphate system can be achieved.

关 键 词：钒磷酸盐 高温固相法 交叉弛豫过程 能量传递 拉曼光谱 稀土发光材料 

分 类 号：TQ422[化学工程] O482.31[理学—固体物理]