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| 银岛膜–有机间隔层–CsPbBr3量子点的荧光增强研究 |
| Fluorescence enhancement in CsPbBr3 quantum dots mediated by silver island films and organic spacer layers |
| 投稿时间：2025-03-14 |
| DOI：10.3969/j.issn.1005-5630.202503140049 |
| 中文关键词: 金属增强荧光 CsPbBr3量子点 银岛膜 层层自组装技术 |
| 英文关键词:metal-enhanced fluorescence CsPbBr3 quantum dots silver islands films layer-by-layer self-assembly |
| 基金项目:上海市自然科学基金（24ZR1452500） |
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| 中文摘要: |
| 光照射至金属薄膜形成的表面等离子激元，可有效提高邻近发光体发光效率，即产生金属增强荧光效应。该金属增强荧光具有很强的距离依赖特性，而要实现无机间隔层的有效制备对设备条件与技艺水平的要求很高。通过沉积不同层数的聚4–苯乙烯磺酸钠和聚烯丙基胺盐酸盐有机层，来控制发光体（CsPbBr3量子点）和底层金属膜（银岛膜）之间的距离。结果表明，当聚电解质层层数为2（对应的厚度为9.2 nm）的时候，CsPbBr3量子点荧光强度增强4.6倍；CsPbBr3量子点荧光寿命从7.2 ns缩至5.6 ns，且形成的复合体系光照稳定性增强。本方法为金属增强钙钛矿荧光特性研究提供了一种低成本、间隔层厚度可调的有效途径。 |
| 英文摘要: |
| When light irradiates metal films, surface plasmon polaritons can be formed, which effectively enhances the luminescence efficiency of adjacent emitters. This phenomenon is known as the metal-enhanced fluorescence effect. However, this enhancement exhibits strong distance dependence, and achieving high-performance inorganic spacer layers typically requires advanced equipment and technical expertise. In this study, we precisely controlled the distance between the emitter (CsPbBr3 quantum dots) and the underlying silver island films by depositing varying numbers of poly (sodium 4-styrenesulfonate) (PSS) and poly (allylamine hydrochloride) (PAH) organic layers. The results demonstrate that two polyelectrolyte bilayers (corresponding to a thickness of 9.2 nm) yield optimal performance: a 4.6-fold enhancement in the fluorescence intensity of CsPbBr3 quantum dots, a reduced fluorescence lifetime from 7.2 ns to 5.6 ns, and improved photostability of the composite system. This method provides a low-cost and thickness-adjustable strategy for studying metal-enhanced fluorescence in perovskite systems. |
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