基于玻璃网络结构调控的NaLnF4 (Ln=Gd, Y, Lu)玻璃陶瓷合成与发光性能研究

NaLnF4 (Ln=Gd, Y, Lu)是一类优质的上转换基质材料，然而其单晶生长受到了立方六方相转变的限制。玻璃陶瓷兼具晶体优异的发光性能和玻璃易制备的特点，是一类有望替代单晶的新型复合块体材料。本项目拟采用熔融急冷法和后续晶化处理，通过改变玻璃组分，系统研究玻璃网络结构与特定相可控析晶的关联，探明NaLnF4纳米晶在玻璃基质中成核与生长的微观机理，掌握影响立方/六方相结构可选择性析晶的关键因素，进而实现稀土掺杂NaLnF4(Ln=Gd, Y, Lu)玻璃陶瓷发光块体材料的可控合成。在此基础上，建立材料制备、玻璃网络结构、晶化动力学及发光性能间关联，进一步指导玻璃析晶，获得具有优异发光特性的NaLnF4(Ln=Gd, Y, Lu)透明纳米结构玻璃陶瓷。本项目的成功实施可促进对玻璃网络结构和可控析晶间关联的深入理解，并为新型玻璃陶瓷的研发提供实验依据和理论基础。

NaLnF4 (Ln=Gd, Y, Lu) is regarded as one of the most efficient upconversion hosts, however, it is quite difficult to grow as monocrystal owing to cubic-to-hexagonal phase transition. As an alternative, glass ceramic is a kind of composite bulk materials, which combines the merits of glass and nanocrystals. In this project, melt quenching and subsequent heat treatment method is adopted. The impact of the growth mechanisms of phase selective nanocrystals on the glass network structure is systematically investigated by changing the composition, grasping the key factors affecting crystallization and growth. And their luminescent properties are also studied corresponding to the nanocrystals microstructure. Guiding by the growth mechanisms, NaLnF4 (Ln=Gd, Y, Lu) nanocrystals embedded glass ceramics are expected to be achieved with outstanding optical performance. Furthermore, this project can promote the understanding of the relationship between the glass network structure and controllable crystallization in depth, providing experimental and theoretical basis for its development.