Lu Xuan, Hu Yang, Guo Jiazhuang, Wang Cai-Feng, Chen Su
State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering, and Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials Nanjing Tech University Nanjing 210009 China.
Adv Sci (Weinh). 2019 Sep 16;6(22):1901694. doi: 10.1002/advs.201901694. eCollection 2019 Nov.
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 CsPbX (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.
全无机卤化物钙钛矿纳米晶体（PNCs）因其出色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不稳定性，极大地限制了它们的实际应用。与此同时，环境监管限制了挥发性有机化合物（VOCs）的排放，促使人们寻找替代的PNC合成和成膜方法。在此，提出了纤维纺丝化学（FSC）用于简便合成高度稳定的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。该方法能够在室温下一步制备CsPbX（X = Cl、Br、I）PNCs/聚（甲基丙烯酸甲酯）/热塑性聚氨酯纤维膜，发射波长在450至660 nm之间可调。值得注意的是，在疏水核壳纳米纤维中原位生成PNCs导致荧光稳定性显著提高。PNCs/聚合物纤维膜在大气中储存90天后光致发光（PL）保持恒定，在水中浸泡120小时后仍保留82%的PL（相比之下，原始PNCs在空气中10天或水中5小时荧光猝灭）。具有优异光学稳定性和极大柔韧性的PNCs/聚合物纤维膜在柔性光电子应用中显示出广阔的前景。这项工作为高性能纳米颗粒/聚合物纤维膜铺平了一条简便的道路。
