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

Abstract

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

CLC Number:

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

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