Tb3+掺杂钒磷酸盐蓝绿发光调控及发光机理研究

摘要/Abstract

摘要： 本文采用高温固相方法合成了不同掺杂浓度的YVO₄∶Tb³⁺、YPO₄∶Tb³⁺和YV_1-xP_xO₄∶Tb³⁺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YVO₄∶Tb³⁺、YPO₄∶Tb³⁺和YV_1-xP_xO₄∶Tb³⁺系列荧光粉室温下的发光性质。受晶体场影响,紫外激发下YVO₄∶Tb³⁺中Tb³⁺发光主要以⁵D₃→⁷F_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-xP_xO₄∶Tb³⁺晶体场环境,增强了基质与⁵D₃、⁵D₄能级间的多声子弛豫及⁵D₃→⁵D₄能级间的交叉弛豫,⁵D₄→⁷F_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YPO₄∶Tb³⁺发光调控作用显著,随着掺杂浓度增加,Tb³⁺的⁵D₃与⁵D₄能级间的交叉弛豫作用增强,⁵D₃发光减弱,⁵D₄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Tb³⁺掺杂钒磷酸盐体系蓝绿发光调控。

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

Abstract: YVO₄, YPO₄ and YV_1-xP_xO₄ phosphors with various Tb³⁺ 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 YVO₄∶Tb³⁺ predominantly arises from the ⁵D₃→⁷F_J (J=6, 5, 4, 2) transitions, resulting in blue emission. The introduction of P element modified the crystal field environment in YV_1-xP_xO₄∶Tb³⁺, enhancing multi-phonon relaxation (MPR) and cross-relaxation (CR) between ⁵D₃ and ⁵D₄ energy levels. With increasing P element content, the emission gradually shifted towards ⁵D₄→⁷F_J′ (J′=6, 5, 4, 3), displaying blue, cyan, and green emissions. In YPO₄∶Tb³⁺, higher doping concentrations enhanced cross relaxation between ⁵D₃ and ⁵D₄ energy levels of Tb³⁺, leading to weakened ⁵D₃ luminescence and intensified ⁵D₄ 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 Tb³⁺-doped vanadium phosphate system can be achieved.

Key words: vanadium phosphate, high-temperature solid-state method, cross-relaxation process, energy transfer, Raman spectrum, rare earth luminescent material

中图分类号:

张守超, 高森单, 刘洪飞, 姜荣云, 王翠红, 聂晓菊, 张丽文, 覃冰. Tb³⁺掺杂钒磷酸盐蓝绿发光调控及发光机理研究[J]. 人工晶体学报, 2024, 53(8): 1422-1433.

ZHANG Shouchao, GAO Sendan, LIU Hongfei, JIANG Rongyun, WANG Cuihong, NIE Xiaoju, ZHANG Liwen, QIN Bing. Study on Tunable Blue-Green Luminescence and Mechanism of Tb³⁺ Doped Vanadium Phosphate[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(8): 1422-1433.

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Tb³⁺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 Tb³⁺ Doped Vanadium Phosphate

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