聚合物包覆改善二维钙钛矿(FPEA)2PbI4光学性能

环境因素（如光照、水蒸气、氧气等）会引发二维钙钛矿材料的降解，其稳定性极大地限制该材料的进一步发展及市场化进程。利用氟化物的强稳定性与疏水性，将其以含氟苯乙胺的形式引入二维钙钛矿的有机层，可以有效地改善二维钙钛矿稳定性，但是荧光效率有所降低。针对这一问题，本文采用聚苯乙烯（PS）、聚甲基丙烯酸甲酯（PMMA）、环烯烃聚合体（COP）三种高分子聚合物对二维钙钛矿薄膜进行包覆，使其荧光强度分别得到2.2、1.3和1.4倍的改善，光照稳定性分别得到3.3、3.1和3.9倍的提升，并进一步验证湿度稳定性。该研究为二维钙钛矿薄膜在光电器件上的开发提供了新思路。

Improvement of the optical properties of two-dimensional perovskite (FPEA)2PbI4 by polymer encapsulation

The environmental factors, such as light radiation, water vapor, and oxygen, induce the degradation of two-dimensional perovskites, and therefore its stability greatly limits the further development and marketization of this material. Taking advantage of the strong stability and hydrophobicity of fluoride, fluorophenylethylamine was introduced into the organic layer of two-dimensional perovskites, which could effectively improve the stability of two-dimensional perovskites, but the fluorescence efficiency was partly reduced. To solve this problem, polystyrene (PS), polymethylmethacrylate (PMMA) and cycloolefin polymer (COP) were employed to encapsulate the two-dimensional perovskite film. The photoluminescence intensity was improved by 2.2, 1.3 and 1.4 times, respectively. The light stability was improved by 3.3, 3.1 and 3.9 times, respectively. Furthermore the humidity stability was also verified. This study provides a new idea for the development of two-dimensional perovskite films in optoelectronic devices.