Wang Qi, Li Ke, Yang Haohan, Lin Donghai, Shih Wan Y, Shih Wei-Heng
School of Energy and Materials, Shanghai Polytechnic University, Shanghai Engineering Research Center of Advanced Thermal Functional Materials, Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai 201209, People's Republic of China.
School of Biomedical Engineering, Science, and Health Systems, Drexel University, United States of America.
Nanotechnology. 2022 Jul 1;33(38). doi: 10.1088/1361-6528/ac77a0.
Inorganic perovskite cesium lead iodide nanocrystals (CsPbINCs) are good candidates for optoelectronic devices because of their excellent properties of remarkable luminous performance (high luminous efficiency, narrow luminous spectral line), and high photoelectric conversion efficiency by using simple preparation method. But their inherent poor stability greatly limits its practical applications. In this paper, electrospinning is used to grow fibrous membranes with embedded cesium lead iodide perovskite nanocrystals (PNCs) formedin a one-step process. It was found that cubic-CsPbIPNCs were formed in polymer fibers, showing bright and uniform fluorescence signals. Furthermore, the water wetting angles were increased by the fibrous structure enhancing the hydrophobicity and the stability of the fibrous membranes in water. The electrospun fibrous membrane containing CsPbIwas combined with another membrane containing CsPbBrunder a blue light-emitting diode (LED) to create a white LED (WLED) in air successfully with CIE coordinates (0.3020, 0.3029), and a correlated color temperature of 7527 °K, indicating high purity of WLED. Our approach provides a new way to create highly stable, photoluminescent water-resistant perovskite nanocrystalline films.
无机钙钛矿铯铅碘纳米晶体（CsPbINCs）因其具有卓越的发光性能（高发光效率、窄发光光谱线）以及通过简单制备方法就能获得高光电转换效率等优异特性，成为光电器件的理想候选材料。但其固有的稳定性差极大地限制了其实际应用。本文采用静电纺丝法一步制备出嵌入铯铅碘钙钛矿纳米晶体（PNCs）的纤维膜。研究发现，立方相CsPbIPNCs在聚合物纤维中形成，呈现出明亮且均匀的荧光信号。此外，纤维结构增强了疏水性，提高了纤维膜在水中的稳定性，从而增大了水接触角。将含CsPbI的静电纺丝纤维膜与另一个含CsPbBr的膜在蓝色发光二极管（LED）下组合，成功在空气中制备出CIE坐标为（0.3020，0.3029）、相关色温为7527°K的白色发光二极管（WLED），表明WLED具有高纯度。我们的方法为制备高度稳定、具有光致发光性且耐水的钙钛矿纳米晶体薄膜提供了一种新途径。
