核壳发光材料中ZrO2/BN阻挡层的形成及其作用机理研究

核壳结构发光材料的研究主要集中于制备和结构调控方面，而较少关注由于核壳间界面扩散所引起的发光强度下降。本项目基于陶瓷材料的稳定性，提出以ZrO2和BN薄膜作为核壳结构发光材料界面扩散阻挡层的研究思路。拟采用层层自组装法、溶剂热或氮热还原等方法在核表面制备不同致密度的ZrO2和BN薄膜，再进一步包覆发光材料壳层，制备具有界面扩散阻挡层的核壳结构发光材料；通过表征核/壳材料组成元素在阻挡层中的分布，阐明核/壳材料元素随阻挡层和热处理条件变化的扩散规律；研究具有扩散阻挡层的核壳结构发光材料的性质，揭示阻挡层的组成和结构与材料性能的关系；阐明扩散阻挡层对于降低界面扩散速率的作用机理；期待制备的具有界面扩散阻挡层的核壳结构发光材料能在节约稀土原料、保持核壳结构的同时具有较高的发光强度，解决现有核壳结构发光材料存在的过低的合成温度所致的发光强度低等出问题，实现核壳结构发光材料设计和制备技术的进步。

Core-shell structure materials have drawn great interest due to its promising properties. Research of core-shell structured phosphors is focused on preparation and structure tuning. However, decreasing in luminescent intensity of this kind of materials caused by interface diffusion is neglected. Based on the exceptional chemical and thermal stability of ceramics, this project propose a layer of ZrO2 and BN films are inserted between the core and shell of the core-shell structured phosphors, as interlayer, to block interface diffusion which is always growing in intensity at high temperatures. ZrO2 and BN films are going to prepare by the Sol-gel method, Solvent thermal and H3BO3 nitrification. XPS and EPMA are used to analysis distribution of elements in interlayers in order to obtain diffusion information of the related elements. Measuring PL properties of the prepared samples would be a help for revealing relation between composition and structure of interlayer and PL properties of the product. Understanding mechanism of the interlayers on decreasing diffussion speed the improving PL intensity in core-shell structured phosphors. The produced core-shell structured phosphors with ZrO2 and BN interlayer are expected with high PL intensity and stable core-shell structure. The aim of the project is to explore the effect of ZrO2 and BN films on the luminescent properties of core-shell structured phosphors and to discuss the possibility mechanism to block interface diffusion.