| 赵龙,简凌锋,谭婉怡,闵永刚.化学通报,2024,87(8):967-972,939. |
| 透明聚酰亚胺表面包覆提升钙钛矿量子点稳定性 |
| Stable Perovskite Quantum Dots Enabled by Colorless Polyimide as the Surface Coating Material |
| 投稿时间：2024-02-07 修订日期：2024-04-10 |
| DOI： |
| 中文关键词: 钙钛矿量子点 光致发光 稳定性 聚酰亚胺 |
| 英文关键词:Perovskite, quantum dots, Photoluminescence, Stability, Polyimide |
| 基金项目:国家自然科学基金项目(U20A20340)和国家重点研发计划项目(2020YFB0408100)资助 |
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| 中文摘要: |
| 钙钛矿量子点具有荧光效率高，发射光谱窄，发射波长的可调等优势，被广泛应用。然而，钙钛矿量子点的稳定性仍较差，极易受到极性溶剂、热、水、氧、光等的影响。表面包覆是有效提升钙钛矿量子点稳定性的手段之一。其中，有机聚合物可明显提升钙钛矿量子点的水稳定性。但是，目前使用的大部分透明有机聚合物的热稳定性较差。透明聚酰亚胺（CPI）在保证高透光率的同时，具有良好的热稳定性、化学稳定性、机械性能、介电性能等。因此，本文介绍了一种采用CPI包覆CsPbBr3量子点提升稳定性的方法，即先将CsPbBr3量子点与聚酰胺酸混合，再通过热亚胺化形成CPI包覆的CsPbBr3量子点。利用聚酰胺酸上的胺基和羧基可与CsPbBr3量子点相互作用，使得CsPbBr3量子点在聚合物材料中充分分散，避免在成膜过程中因CsPbBr3量子点聚集导致的发光性能下降。最终，CPI包覆的CsPbBr3量子点具有良好发光性能的前提下，还可有效削弱外界水、紫外光等的影响，明显提升CsPbBr3量子点的稳定性。 |
| 英文摘要: |
| Perovskite quantum dots have been widely used due to their high photoluminescence quantum efficiencies, narrow FWHM, tunable band gap and so on. However, perovskite quantum dots suffer from poor stability in the presence of polar solvent, heat, air and illumination. Surface coating is one of the effective ways to overcome this issue. Polymer-coated perovskite quantum dots always show high resistance to moisture, but most of transparent polymers shows poor thermal stability. Colorless polyimides (CPIs) exhibit good heat resistance, chemical stability, mechanical property and dielectric property, in addition to high transparency. Herein, we introduce a way to improve the stability of CsPbBr3 quantum dots via CPI coating, in which CsPbBr3 quantum dots are first mixed with polyamic acid and then thermal imidization. Polyamic acid can interact with CsPbBr3 quantum dots via amine groups and carboxyl groups, which is favorable to the dispersion of CsPbBr3 quantum dots in the polymer matrix and thus prevent the decline of luminescent property induced by the aggregation of quantum dots during film formation. As a result, the as-prepared CPI-coated CsPbBr3 quantum dots possess high stability under moisture and UV light, in addition to good luminescent property. |
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