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JOURNAL OF SYNTHETIC CRYSTALS ›› 2024, Vol. 53 ›› Issue (8): 1422-1433.

• Research Articles • Previous Articles     Next Articles

Study on Tunable Blue-Green Luminescence and Mechanism of Tb3+ Doped Vanadium Phosphate

ZHANG Shouchao1, GAO Sendan1, LIU Hongfei1, JIANG Rongyun1, WANG Cuihong1, NIE Xiaoju1, ZHANG Liwen2, QIN Bing2   

  1. 1. School of Science, Tianjin Chengjian University, Tianjin 300384, China;
    2. Zolix Instruments Co., Ltd., Beijing 101102, China
  • Received:2024-04-08 Online:2024-08-15 Published:2024-08-14

Abstract: YVO4, YPO4 and YV1-xPxO4 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 5D37FJ (J=6, 5, 4, 2) transitions, resulting in blue emission. The introduction of P element modified the crystal field environment in YV1-xPxO4∶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 5D47FJ′ (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

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