用于明亮电致发光二极管的固态荧光碳纳米点的克级室温合成,Small

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用于明亮电致发光二极管的固态荧光碳纳米点的克级室温合成
Small ( IF 13.0 ) Pub Date : 2023-02-08 , DOI: 10.1002/smll.202206715
Mengyun Zheng ₁ , Haoran Jia ₁ , Biao Zhao ₁ , Chengyang Zhang ₁ , Qi Dang ₁ , Huanyu Ma ₁ , Kunxiang Xu ₁ , Zhan'ao Tan ₁

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高温高压的反应条件会引入结构缺陷、高能耗和安全风险，严重阻碍有机碳纳米点（CD）的工业化应用。此外，聚集引起的猝灭效应也从根本上限制了基于CD的电致发光二极管(LED)。在此，首次引入快速一步室温合成策略来制备高发射固态荧光CD（RT-CD）。采用强氧化剂高碘酸钾(KIO _{4 )作为催化剂，在室温下，邻}苯二胺和4-二甲氨基苯酚在水溶液中仅5分钟即可环化。所得有机分子2-(二甲氨基)吩嗪将在结晶过程中进行动力学自组装以产生超分子结构CD。精心排列的超分子结构（J聚集体）赋予CDs强烈的固态荧光。密度泛函理论（DFT）计算表明，由于独特的供体-π-受体结构，RT-CDs的激发态表现出电荷转移特性。通过器件工程的系统优化，制造了基于高性能单色 RT-CD 的电致发光 LED（2967 cd m ^-2和 1.38 cd A ^{-1 ）。}这项工作为快速大规模制备CD提供了具体可行的途径，推动了基于CD的光电器件的商业化。

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Gram-Scale Room-Temperature Synthesis of Solid-State Fluorescent Carbon Nanodots for Bright Electroluminescent Light Emitting Diodes

The reaction conditions of high temperature and high pressure will introduce structural defects, high energy consumption, and security risks, severely hindering the industrial application of organic carbon nanodots (CDs). Moreover, the aggregation caused quenching effect also fundamentally limits the CDs based electroluminescent light emitting diodes (LEDs). Herein, for the first time, a rapid one-step room temperature synthetic strategy is introduced to prepare highly emissive solid-state-fluorescent CDs (RT-CDs). A strong oxidizing agent, potassium periodate (KIO₄), is adopted as a catalyst to facilitate the cyclization of o-phenylenediamine and 4-dimethylamino phenol in aqueous solution at room temperature for only 5 min. The resultant organic molecule, 2-(dimethylamino) phenazine, will self-assemble kinetically to generate supramolecular-structure CDs during crystallization. The elaborately arranged supramolecular structure (J aggregates) endows CDs with intense solid-state-fluorescence. Density functional theory (DFT) calculation shows that the excited state of RT-CDs exhibits charge transfer characteristic owing to the unique donor-Π-acceptor structure. A high-performance monochrome RT-CDs based electroluminescent LEDs (2967 cd m⁻² and 1.38 cd A⁻¹) were fabricated via systematic optimizations of device engineering. This work provides a concrete and feasible avenue for the rapid and massive preparation of CDs, advancing the commercialization of CDs based optoelectronic devices.

更新日期：2023-02-08

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