Study on Tunable Blue-Green Luminescence and Mechanism of Tb3+Doped Vanadium Phosphate
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 5D3→7FJ(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 5D4→7FJ'(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 5 D3 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.
vanadium phosphatehigh-temperature solid-state methodcross-relaxation processenergy transferRaman spectrumrare earth luminescent material
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