Fiber-Spinning-Chemistry Method toward In Situ Generation of Highly Stable Halide Perovskite Nanocrystals
Fiber-Spinning-Chemistry Method toward In Situ Generation of Highly Stable Halide Perovskite Nanocrystals
复制标题
原位生成高稳定卤化物钙钛矿纳米晶体的纤维纺丝化学方法
DOI：
10.1002/advs.201901694
复制
发表时间：
2019-09-16
期刊：
影响因子：
15.1
通讯作者：
Chen, Su
中科院分区：
文献类型：
--
作者：
Lu, Xuan;Hu, Yang;Chen, Su
全无机卤化物钙钛矿纳米晶(PNC)因其优异的光学性能而受到越来越多的关注。然而，这类纳米材料存在固有的不稳定性，极大地限制了其实际应用。同时，环境法规限制了挥发性有机化合物(VOCs)的排放，引发了对PNC合成和成膜的替代方法的探索。在此，纤维纺丝化学(FSC)被提出用于合成高稳定的PNC纤维膜。FSC工艺利用纺丝纤维作为反应器，减少了VOCs的产生。这种方法可以在室温下一步制备CsPbX3(X=Cl，Br，I)PNC/聚甲基丙烯酸甲酯/热塑性聚氨酯纤维薄膜，其发射波长在450~660 nm之间可调。值得注意的是，在疏水的核壳纳米纤维中原位生成PNC导致了极大的荧光稳定性的提高。PNC/聚合物纤维膜在大气中放置90d后，光致发光(PL)保持不变，在水中浸泡120h后，光致发光保持82%(而未处理的PNCs在空气中10d或水中5h荧光猝灭)。PNC/聚合物纤维薄膜具有优异的光学稳定性和极大的柔韧性，在柔性光电子领域具有广阔的应用前景。这项工作为高性能纳米粒子/聚合物纤维薄膜铺平了一条便捷的道路。
All-inorganic halide perovskite nanocrystals (PNCs) have drawn increasing attention owing to their splendid optical properties. However, such nanomaterials suffer from intrinsic instability, greatly limiting their practical application. Meanwhile, environmental regulation has restricted the emissions of volatile organic compounds (VOCs), initiating a search for alternative approaches to PNC synthesis and film forming. Herein, fiber-spinning chemistry (FSC) is proposed for easy-to-perform synthesis of highly stable PNC fibrous films. The FSC process utilizes spinning fibers as reactors, reducing the generation of VOCs. This method enables the fabrication of CsPbX3 (X = Cl, Br, I) PNCs/poly(methyl methacrylate)/thermoplastic polyurethanes fibrous films at room temperature in one step, exhibiting tunable emission between 450 and 660 nm. Significantly, the in situ generation of PNCs in hydrophobic core-shell nanofibers results in highly improved fluorescence stability. PNCs/polymer fibrous films keep constant in photoluminescence (PL) after storage at atmosphere for 90 d and retain 82% PL after water immersion for 120 h (vs fluorescence quenching in 10 d in air or 5 h in water for pristine PNCs). The PNCs/polymer fibrous films endowed with superior optical stability and great flexibility show promising potentials in flexible optoelectronic applications. This work paves a facile way toward high-performance nanoparticles/polymer fibrous films.