CsPbX3纳米晶镶嵌高导热氟磷酸盐玻璃陶瓷的设计、制备及性能研究

Due to the advantages of high heat resistance and high efficiency, glass-ceramic phosphor has become one of the research frontiers and hotspots in the field of laser lighting/display. Although great progress has been made in the research of phosphors used in high-power density light sources, there are still some problems such as broad emission peak and low thermal conductivity, which seriously restrict the improvement of theoretical lumen efficiency and brightness. Therefore, it is of great significance to study phosphors with narrow spectral emission, high thermal conductivity and high brightness. In this proposal, CsPbX3 perovskite nanocrystals embedded fluorophosphate glass-ceramic phosphor with high thermal conductivity should be an available approach. Based on our previous fluorophosphate glass, this proposal would further invistigate the mechanism of luminescence and heat conduction from a novel thermal conducting structural glass-ceramic by integrating the advantages of CsPbX3 perovskite quantum dot, such as high efficiency, high brightness and narrow emission spectrum. This proposal is intended to obtain the fluorophosphate glass with high concentration of CsPbX3 by adjusting the fluoride ratio and network structure. A new type of glass-ceramic with high thermal conductivity should be constructed by theoretical simulation and matching of high thermal conductivity phase. By regulating the heat treatment conditions, the controlled growth of CsPbX3 nanocrystals in the ceramic composite can be realized, which provides a new research idea and solution for the development of new high-power density light source to stimulate high-luminance phosphors.

荧光玻璃陶瓷由于具有高耐热性及高效率等优点，目前成为激光照明/显示领域的前沿和热点之一。虽然高功率密度光源荧光体的研究取得了显著进展，但依旧存在发射峰宽及热导率低的问题，严重制约了理论流明效率及亮度的提高，因此研究窄线宽、高亮度发光的高导热荧光体具有重要意义。本项目在氟磷酸盐玻璃基础之上，充分融合CsPbX3钙钛矿量子点高效率、高亮度、窄线宽发光等优点，进一步设计、构建新的导热结构，探讨CsPbX3纳米晶镶嵌高导热氟磷酸盐玻璃陶瓷的发光及导热机理，寻找适用于高功率密度光源激发的荧光体突破口。拟通过调控氟化物比例及网络结构获得高浓度CsPbX3掺杂的氟磷酸盐玻璃；通过理论模拟和高热导相与氟磷酸盐玻璃的匹配，构建高热导率的新型复合玻璃陶瓷；通过调控二次热处理制度，实现复合陶瓷基质中CsPbX3纳米晶的可控生长，为新型高功率密度光源激发高亮度荧光体的发展提供新的研究思路及解决方案。

基于卤化物钙钛矿的光谱转换器技术在实现高效率固态照明显示方面具有巨大的应用前景，受到了广泛关注和研究。目前其实用化过程还面临诸多瓶颈，其中稳定性是影响能量转换效率的关键要素。本项目经过三年的努力，圆满完成了课题任务，达到了预期目标。本项目以探索实现高稳定性的卤化物钙钛矿纳米晶镶嵌玻璃陶瓷荧光体为目的，从无定型结构相变和有序结构设计入手，结合稳态热分布调控手段，在卤化物钙钛矿纳米晶镶嵌玻璃陶瓷荧光体在高功率半导体照明器件中的应用、日盲紫外光通信系统中的应用等方面开展了富有创新性和系统性的研究工作：（1）实现了在氟磷酸盐过冷液体中可控生长卤化物钙钛矿纳米晶；（2）提出了基于纳米玻璃相变的卤化物钙钛矿纳米晶原位生长机理；（3）深入探讨了卤化物钙钛矿纳米晶在非晶基质中的相变过程；（4）实验验证了基于光热效应的卤化物钙钛矿结构光退化机制；（5）研究了卤化物钙钛矿纳米晶镶嵌玻璃陶瓷在高功率照明及高灵敏光探测领域的应用。本项目相关研究结果为卤化物钙钛矿纳米晶高稳定化提供了实验数据支持。