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Disclosing the emissive surface traps in green-emitting Carbon Nanodots
Carbon ( IF 10.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.carbon.2020.11.030 Alice Sciortino , Francesco Ferrante , Nicolò Mauro , Gianpiero Buscarino , Luisa Sciortino , Gaetano Giammona , Marco Cannas , Dario Duca , Fabrizio Messina
Carbon ( IF 10.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.carbon.2020.11.030 Alice Sciortino , Francesco Ferrante , Nicolò Mauro , Gianpiero Buscarino , Luisa Sciortino , Gaetano Giammona , Marco Cannas , Dario Duca , Fabrizio Messina
Abstract The bright photoluminescence of surface-functionalized carbon nanoparticles, known as carbon nanodots (CDs), has been studied for more than a decade because of its fundamental photo-physical interest and strong technological potential. However, the essential nature of the electronic states involved in their typical light emission remains very elusive. Here, we provide conclusive evidence that surface carboxylic moieties are the key to CD fluorescence. The synergy of nanosecond and femtosecond optical studies, cryogenic fluorescence, computational investigations and chemical engineering of a strategically chosen model CD system, allows to demonstrate that their visible-light transitions are due to the electron transfer from nitrogen atoms of the core to/from specific charge trap states strongly localized on –COOH surface groups. These results clarify a long-standing open problem in the photo-physics of carbon dots, and help to establish more solid foundations for the understanding of their optical response.
中文翻译:
揭示发绿光的碳纳米点中的发射表面陷阱
摘要 表面功能化碳纳米粒子(称为碳纳米点(CD))的明亮光致发光由于其基本的光物理兴趣和强大的技术潜力而被研究了十多年。然而,它们典型的光发射所涉及的电子态的本质仍然非常难以捉摸。在这里,我们提供了确凿的证据,表明表面羧基部分是 CD 荧光的关键。纳秒和飞秒光学研究、低温荧光、计算研究和战略选择模型 CD 系统的化学工程的协同作用,可以证明它们的可见光跃迁是由于电子从核心的氮原子转移到/从特定的电荷陷阱态强烈地集中在 –COOH 表面基团上。
更新日期:2021-03-01
中文翻译:
揭示发绿光的碳纳米点中的发射表面陷阱
摘要 表面功能化碳纳米粒子(称为碳纳米点(CD))的明亮光致发光由于其基本的光物理兴趣和强大的技术潜力而被研究了十多年。然而,它们典型的光发射所涉及的电子态的本质仍然非常难以捉摸。在这里,我们提供了确凿的证据,表明表面羧基部分是 CD 荧光的关键。纳秒和飞秒光学研究、低温荧光、计算研究和战略选择模型 CD 系统的化学工程的协同作用,可以证明它们的可见光跃迁是由于电子从核心的氮原子转移到/从特定的电荷陷阱态强烈地集中在 –COOH 表面基团上。