Exploiting narrow-bandwidth-emission fluorescent materials is crucial for next-generation wide-color gamut displays. Inspired by the narrow-bandwidth-emission characteristic of chlorophyll derivates, the present work develops a facile strategy to synthesize a series of red-emitting chlorophyll-structured CDs (CHL-CDs) with ultra-high color purity and good carrier mobility from different traditional Chinese medicine leaves through a simple cross-linking polymerization and carbonization process. The obtained CHL-CDs exhibit bright photoluminescence centered at 671 nm, ultra-high color purity with an FWHM of 23 nm, and a high photoluminescence quantum yield of up to 62%. More importantly, based on in-depth experimental and theoretical studies on the macroscopic host–guest interactions and microscopic interfacial interactions between the CHL-CDs and charge transporting materials, high-performance red electroluminescent light-emitting diodes are successfully prepared, with FWHM of only 28 nm, turn-on voltage of 3.7 V, maximum luminance of 623 cd m−2, and maximum current efficiency of 0.26 cd A−1. This study provides a universal platform for fabricating narrow-bandwidth-emission CDs with significant applications in photoelectric devices.

中文翻译：

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生物质叶绿素的交联聚合和碳化用于碳点超窄发射电致发光器件

利用窄带发射荧光材料对于下一代广色域显示器至关重要。受叶绿素衍生物窄带发射特性的启发，本工作开发了一种简便的策略，从不同的传统材料中合成了一系列具有超高色纯度和良好载流子迁移率的红光叶绿素结构CD（CHL-CD）。中药叶经过简单的交联聚合和碳化过程。所获得的CHL-CD表现出以671 nm为中心的明亮光致发光、半高宽为23 nm的超高色纯度以及高达62%的高光致发光量子产率。更重要的是，基于对CHL-CDs与电荷传输材料之间的宏观主客体相互作用以及微观界面相互作用的深入实验和理论研究，成功制备了高性能红色电致发光二极管，半高宽仅为28 nm，开启电压为 3.7 V，最大亮度为 623 cd m−2，最大电流效率为 0.26 cd A−1。这项研究为制造窄带发射CD提供了一个通用平台，在光电器件中具有重要的应用。