The use of carbon dots (CDs) to construct binary donor–acceptor exciplex systems has been shown to be an effective method for obtaining organic long persistent luminescence (OLPL). However, such a system currently necessitates the prior synthesis of CDs before integration with the organic matrix, thus complicating the reproducibility and large-scale production of the materials. Furthermore, attaining color-tunable long persistent luminescence (LPL) is also a major challenge for the system. Here, we report a one-step synthesis strategy for color-tunable CDs-based OLPL material (named CDs@CA). CDs donors and CA acceptors in the material can be generated in a single step during the reaction. Under ambient conditions and even in aqueous media, the LPL color of CDs@CA can be changed by the excitation wavelength, enabling color tuning from blue to green emission. This is the first time for the color tuning to be achieved in CDs-based OLPL materials. Meanwhile, the strategy is applicable to a wide range of alternative carbon sources, which makes it possible to rapidly prepare a wide range of CDs-based OLPL materials with varying LPL performance by selecting different carbon sources. This work is greatly beneficial to the development and application of CDs-based OLPL systems.

中文翻译：

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一步合成可调色碳点有机长余辉发光材料


使用碳点（CD）构建二元供体-受体激基复合物系统已被证明是获得有机长余辉发光（OLPL）的有效方法。然而，这种系统目前需要在与有机基质集成之前预先合成碳点，从而使材料的再现性和大规模生产变得复杂。此外，获得颜色可调的长余辉发光（LPL）也是该系统的一个主要挑战。在这里，我们报告了一种基于颜色可调 CD 的 OLPL 材料（名为 CDs@CA）的一步合成策略。材料中的CD供体和CA受体可以在反应过程中一步生成。在环境条件下，甚至在水介质中，CDs@CA 的 LPL 颜色可以通过激发波长改变，从而实现从蓝色发射到绿色发射的颜色调谐。这是首次在基于 CD 的 OLPL 材料中实现颜色调整。同时，该策略适用于广泛的替代碳源，这使得通过选择不同的碳源快速制备具有不同LPL性能的各种基于CDs的OLPL材料成为可能。这项工作对于基于CD的OLPL系统的开发和应用非常有益。