Liang Panting, Zhang Pan, Pan Aizhao, Yan Ke, Zhu Yongsheng, Yang Minyan, He Ling
ACS Appl Mater Interfaces. 2019 Jun 26;11(25):22786-22793. doi: 10.1021/acsami.9b06811. Epub 2019 Jun 17.
All-inorganic cesium lead halide perovskite nanocrystals (CsPbX, X = Cl, Br, or I) present broad applications in the field of optoelectronics due to their excellent photoluminescence (PL), narrow spectral bandwidth, and wide spectral tunability. However, their poor stability limits their practical application. In this work, we successfully use an in situ crystallization strategy for growing and cladding CsPbBr perovskite nanocrystals in poly(vinylidene difluoride) (PVDF). The CsPbBr nanocrystals in the as-fabricated CsPbBr@PVDF composites have an average diameter of 16-18 nm and a strong PL emission (537 nm), with a photoluminescence quantum yield exceeding 30%. In addition, the fabricated CsPbBr@PVDF composites present improved resistance to heat and water preserving with remarkable optical performance, owing to the effective protection of PVDF. Moreover, the CsPbBr nanocrystals generated in PVDF can withstand temperatures up to 170 °C and can be completely immersed in water for 60 days while still retaining high PL intensity, which facilitate the practical application of CsPbBr perovskite nanocrystals. These CsPbBr@PVDF composite films with remarkable optical performances and superior anti-interference ability have broad application prospects in optoelectronics as well as good potential as temperature sensors in mechanical engineering.
全无机铯铅卤化物钙钛矿纳米晶体（CsPbX，X = Cl、Br或I）由于其优异的光致发光（PL）、窄光谱带宽和宽光谱可调性，在光电子领域具有广泛的应用。然而，它们较差的稳定性限制了其实际应用。在这项工作中，我们成功地采用原位结晶策略在聚偏二氟乙烯（PVDF）中生长和包覆CsPbBr钙钛矿纳米晶体。所制备的CsPbBr@PVDF复合材料中的CsPbBr纳米晶体平均直径为16 - 18 nm，具有强烈的PL发射（537 nm），光致发光量子产率超过30%。此外，由于PVDF的有效保护，所制备的CsPbBr@PVDF复合材料具有改善的耐热性和耐水性，并保持了显著的光学性能。而且，在PVDF中生成的CsPbBr纳米晶体能够承受高达170°C的温度，并且可以完全浸入水中60天，同时仍保持高PL强度，这有利于CsPbBr钙钛矿纳米晶体的实际应用。这些具有显著光学性能和优异抗干扰能力的CsPbBr@PVDF复合薄膜在光电子领域具有广阔的应用前景，在机械工程中作为温度传感器也具有良好的潜力。
