Development of halide perovskite composite with thermal-conductive microstructure for high power LED

用于高功率LED的具有导热微结构的卤化物钙钛矿复合材料的开发

• 批准号: 20F40051
• 负责人: 田部 勢津久
• 金额: $ 1.41万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-11-13 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20F40051/
• 关键词: ペロブスカイト; 結晶化ガラス; 量子ドット; ハロゲン化物; 波長シフト; 相転移; 蛍光; ペロブスカイト; 結晶化ガラス; 量子ドット; ハロゲン化物; 波長シフト; 相転移; 蛍光

Mixed-halide perovskites have attracted great attention in applications of lighting and photovoltaic devices due to their excellent properties. Understanding the phase segregation mechanism of mixed-halide perovskite has significance for suppressing the performance degradation of optoelectronic devices. Herein, we investigate the mixed-halide perovskite nanocrystals (NCs) in isolation from the external factors (oxygen, moisture, and pressure) using glass encapsulation, which shows excellent photostability against phase segregation. By monitoring the structural evolution of the NCs in glass matrices, the coexisting phase segregation and amorphization of mixed-halide perovskites are observed in real-time. The results show that thermal-induced local temperature increase plays a dominant role in the phase segregation of mixed-halide perovskite NCs. The recovery process is driven by the spontaneous crystallization of the amorphous mixed-halide phase. The clarified dynamic equilibrium process between the compositional segregation (mixing) and structural disorder (order) gives us a better insight into the reversible phase segregation mechanism of mixed-halide perovskite.

由于其出色的特性，混合壁式钙钛矿吸引了照明和光伏设备的应用。了解混合甲基钙钛矿的相分离机理对于抑制光电设备的性能降解具有重要意义。本文中，我们使用玻璃封装从外部因素（氧气，水分和压力）分离出混合卤化物钙钛矿纳米晶体（NCS），该因子（氧气，水分和压力）均显示出极好的光稳定性针对相对于相位分离。通过监测NC在玻璃基质中的结构演化，可以实时观察到混合壁性钙钛矿的共存相分离和非晶化。结果表明，热诱导的局部温度升高在混合甲基钙钛矿NC的相分离中起主要作用。恢复过程是由无定形混合壁相的自发结晶驱动的。澄清的组成分离（混合）和结构障碍（阶）之间的动态平衡过程使我们可以更好地深入了解混合甲基钙钛矿的可逆相分离机制。