采用共沉淀法制备了EuVO4@YVO4核壳结构纳米颗粒,然后用聚电解质聚苯乙烯磺酸钠对其进行包覆和保护,并在200?C下对样品水热处理0—48 h.在水热处理48 h后,样品的发光强度增强了约5倍,平均发光寿命由0.410 ms延长至0.579 ms.对样品的发光衰减曲线的拟合、分析为Eu3+的扩散提供了有力的证据.这种自内而外的扩散降低了样品核心中Eu3+的局域浓度,削弱了浓度猝灭效应,同时又能够避免表面猝灭效应的发生,从而使得样品的发光寿命变长、发光效率迅速提升. EuVO4 @ YVO4 core-shell nanoparticles were prepared by co-precipitation method and then coated and protected by poly (sodium polystyrene sulfonate), and the samples were hydrothermally treated at 200 ~ C for 0-48 h. After 48 h of heat treatment, the luminescence intensity of the sample increased about 5 times and the average luminescence lifetime increased from 0.410 ms to 0.579 ms. The fitting and analysis of the luminescence decay curve of the sample provided strong evidence for the diffusion of Eu3 + The internal and external diffusion reduces the local concentration of Eu3 + in the sample core, weakens the concentration quenching effect and avoids the surface quenching effect, thereby making the emission life of the sample longer and the luminous efficiency rapidly increasing.