Lv Wenzhen, Li Ling, Xu Mingchuan, Hong Junxian, Tang Xingxing, Xu Ligang, Wu Yinghong, Zhu Rui, Chen Runfeng, Huang Wei
Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications (NUPT), Nanjing, 210023, China.
Shanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, 710072, China.
Adv Mater. 2019 Jul;31(28):e1900682. doi: 10.1002/adma.201900682. Epub 2019 May 15.
Metal halide perovskite quantum dots (PQDs), with excellent optical properties and spectacular characteristics of direct and tunable bandgaps, strong light-absorption coefficients, high defect tolerance, and low nonradiative recombination rates, are highly attractive for modern optoelectronic devices. However, the stability issue of PQDs remains a critical challenge of this newly emerged material despite the recent rapid progress. Here, the encapsulation strategies to improve the stability of PQDs are comprehensively reviewed. A special emphasis is put on the effects of encapsulation, ranging from the improvement of chemical stability, to the inhibition of light-induced decomposition, to the enhancement of thermal stability. Particular attention is devoted to summarizing the encapsulation approaches, including the sol-gel method, the template method, physical blending, and microencapsulation. The selection principles of encapsulation materials, including the rigid lattice or porous structure of inorganic compounds, the low penetration rate of oxygen or water, as well as the swelling-deswelling process of polymers, are addressed systematically. Special interest is put on the applications of the encapsulated PQDs with improved stability in white light-emitting diodes, lasers, and biological applications. Finally, the main challenges in encapsulating PQDs and further investigation directions are discussed for future research to promote the development of stable metal halide perovskite materials.
金属卤化物钙钛矿量子点（PQDs）具有优异的光学性能以及直接且可调节的带隙、强光吸收系数、高缺陷容忍度和低非辐射复合率等显著特性，对现代光电器件极具吸引力。然而，尽管近期取得了快速进展，但PQDs的稳定性问题仍然是这种新出现材料面临的关键挑战。在此，全面综述了提高PQDs稳定性的封装策略。特别强调了封装的效果，从提高化学稳定性到抑制光致分解，再到增强热稳定性。尤其关注总结封装方法，包括溶胶 - 凝胶法、模板法、物理共混和微胶囊化。系统阐述了封装材料的选择原则，包括无机化合物的刚性晶格或多孔结构、氧气或水的低渗透率以及聚合物的溶胀 - 去溶胀过程。特别关注具有改善稳定性的封装PQDs在白光发光二极管、激光器和生物应用中的应用。最后，讨论了封装PQDs的主要挑战和进一步的研究方向，以供未来研究推动稳定金属卤化物钙钛矿材料的发展。
