Cesium lead iodide electrospun fibrous membranes for white light-emitting diodes.
Cesium lead iodide electrospun fibrous membranes for white light-emitting diodes.
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用于白光发光二极管的纤维铅碘化电纺纤维膜。
DOI：
10.1088/1361-6528/ac77a0
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发表时间：
2022-07-01
期刊：
影响因子：
3.5
通讯作者：
中科院分区：
文献类型：
--
作者：
无机钙钛矿型碘化铯铅纳米晶（CsPbI 3 NCs）具有发光效率高、发光谱线窄、光电转换效率高等优点，制备方法简单，是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。在本文中，静电纺丝是用来生长纤维膜与嵌入碘化铯铅钙钛矿纳米晶体（PNC）形成原位在一个步骤的过程。结果表明，聚合物纤维中形成了立方相的α-CsPbI 3 PNC，荧光信号明亮、均匀。此外，水润湿角增加的纤维结构增强的疏水性，从而在水中的纤维膜的稳定性。将含有CsPbI 3的电纺纤维膜与另一种含有CsPbBr 3的膜在蓝光LED下组合，成功地在空气中产生白光LED，其CIE坐标为（0.3020，0.3029），相关色温（CCT）为7527°K，表明WLED的纯度高。我们的方法提供了一种新的方法来创建高度稳定的，光致发光的耐水钙钛矿纳米晶薄膜。
Inorganic perovskite cesium lead iodide nanocrystals (CsPbI3 NCs) 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) formed in situ in a one-step process. It was found that cubic α-CsPbI3 PNCs 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 thus stability of the fibrous membranes in water. The electrospun fibrous membrane containing CsPbI3 was combined with another membrane containing CsPbBr3 under a blue LED to create a white-light LED in air successfully with CIE coordinates (0.3020, 0.3029), and a correlated color temperature (CCT) of 7527°K, indicating high purity of WLED. Our approach provides a new way to create highly stable, photoluminescent water-resistant perovskite nanocrystalline films.
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