【摘要】 新型磁性荧光材料的开发对鉴定和刑事侦查具有重要意义。由于传统相机中使用的光敏元件在500～700nm范围内表现出最高的量子效率，因此以507～533 nm、533～568 nm和637～683 nm为主发射峰的镧系上转换纳米粒子（UCNPs）适合用于构建磁性荧光材料。本文通过配体连接的方法证实了一种磁性上转换纳米颗粒—NaGdF₄:Yb,Er-Fe₃O₄。在优化反应参数后，复合颗粒获得了优异的磁性能和上转换荧光强度，并且可在各种基底上实现高对比度的潜在指纹识别。得益于上转换发光与磁性的结合，指纹识别具有了高灵敏度与通用性。更多还原

【Abstract】 The development of new magnetic fluorescent materials is of great significance for identification and criminal investigation. Since the photosensitive elements used in conventional cameras have exhibited the highest quantum efficiency in the range of 500–700 nm, lanthanide-based upconversion nanoparticles（UCNPs） with main emission peaks at 507–533 nm, 533–568 nm and 637–683 nm are suitable for constructing magnetic fluorescent materials. In this work, we demonstrate a type of magnetic upconversion nanoparticle（MUCNP） of NaGdF₄:Yb,Er-Fe₃O₄ by a ligand-linked method.After optimizing the reaction parameters, the composite particles possess remarkable magnetic properties and upconversion fluorescence intensity and achieve high contrast for latent fingerprint recognition on various substrates. The combination of upconversion luminescence and magnetism contributes to good fingerprint recognition sensitivity and universality.更多还原