低温固相烧结制备氧化硅基钙钛矿纳米晶复合玻璃及光学性能研究

全无机钙钛矿纳米晶因发光效率高、光谱可调等特性，是光电领域的研究热点，但是稳定性差一直阻碍着其实际应用。玻璃因透过率高、稳定性好等特点，是钙钛矿纳米晶理想的基体材料。但是熔融析晶法难以在玻璃中复合多组分、复杂结构钙钛矿纳米晶，极大地限制其功能性拓展。因此，制备高性能钙钛矿纳米晶复合玻璃仍然存在挑战。.针对上述问题，本项目旨在发展一种高性能氧化硅基钙钛矿纳米晶复合玻璃的低温固相烧结制备新途径：首先在介孔孔道内限域合成钙钛矿纳米晶，保证其尺寸可控、分布均匀，然后采用放电等离子体烧结技术低温快速（<960℃，制备时长小于10min）制备纳米晶复合玻璃，实现纳米晶含量、组分与结构可调控。通过系统研究纳米晶/介孔复合粉体的微结构演变及其合成工艺-烧结工艺-复合玻璃性能三者间的对应关系，阐明低温固相烧结致密化新机理及钙钛矿纳米晶复合玻璃发光机理，实现可控化制备全光谱可调的高性能钙钛矿纳米晶复合玻璃。

Owing to the high luminous efficiency and tunable emission spectra, inorganic perovskite nanocrystals have been considered as promising candidates to be applied in optoelectronic field, while their poor stability hinders the practical applications. Glass is an ideal matrix material for perovskite nanocrystals because of the high transmittance and good stability. However, it is difficult to prepare luminescent glasses containing perovskite nanocrystals with multi-components or complex structures by traditional melt-quenching methods, which greatly limits the functional extension. Therefore, it is still a challenge to prepare perovskite nanocrystals embedded glasses with high performance..In this project, a new route is proposed for preparing high-performance silica-based perovskite nanocrystals embedded glasses through solid-state sintering at low-temperature. Firstly, the perovskite nanocrystals can be well confined in the mesoporous channel, and thus controllable size and uniform distribution can be guaranteed. Then, by adopting the Spark Plasma Sintering technology, the perovskite nanocrystals embedded glasses can be rapid prepared at low temperature (<960℃, within 10min), which could realize tunable concentration, composition and structure of perovskite nanocrystals. Through the systematic study on the microstructure evolution of perovskite nanocrystals/mesoporous silica composite powder and the corresponding relationship between the synthesis process, sintering process and properties of perovskite nanocrystals embedded glasses, the densification mechanism of mesoporous composite powder and the luminescent mechanism of perovskite nanocrystals embedded glasses will be clarified. It is expected this project will promote the realization of controllable preparation of high-performance perovskite nanocrystals embedded glasses with tunable emission in full spectrum.