Phenylenediamine-derived near infrared carbon dots: The kilogram-scale preparation, formation process, photoluminescence tuning mechanism and application as red phosphors
Phenylenediamine-derived near infrared carbon dots: The kilogram-scale preparation, formation process, photoluminescence tuning mechanism and application as red phosphors
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DOI：
10.1016/j.carbon.2022.02.054
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发表时间：
2022-03-04
期刊：
影响因子：
10.9
通讯作者：
Peng, Zhili
中科院分区：
文献类型：
--
作者：
Ji, Chunyu;Han, Qiurui;Peng, Zhili
报道了以邻苯二胺(o-PDA)为原料制备千克级近红外(NIR)碳点，产率超过96%，每克近红外碳点的成本估算仅为0.1美元。阐明了C-DOTS的形成过程，提出了C-DOTS的结构模型，揭示了其中的关键中间体。令人兴奋的是，C点的光学性质可以通过简单的质子化-去质子化过程进行可逆调节。质子化后，C点的荧光发射波长可红移47 nm，去质子化可使光致发光量子产率提高3倍。这些光学变化归因于表面质子对激发电子的稳定作用，并根据计算的带隙给出了C点的电子过渡态图。所制备的C点证明了它们是用于组装红色LED的廉价且容易获得的荧光体。(C)2022爱思唯尔有限公司。保留所有权利。
Kilogram-scale preparation of near infrared (NIR) carbon dots (C-dots) from o-phenylenediamine (o-PDA) with over 96% yield was reported in this study, and the estimated cost for each gram of C-dots was only $ 0.1. The formation process of the C-dots was elucidated and the structural model was also proposed in which the key intermediates were revealed. Excitingly, the optical properties of the C-dots could be reversibly tuned via a facile protonation-deprotonation process. Upon protonation, fluorescence emission wavelength of the C-dots could be red shifted for 47 nm, and deprotonation could enhance the photoluminescence quantum yield by three times. These optical alterations were attributed to stabilization of the excited electrons by the surface protons, and diagrams showing the electronic transition states of the C-dots were proposed according to the calculated band gaps. The as prepared C-dots demonstrated themselves as cheap and readily available phosphors for the assembling of red LEDs. (C) 2022 Elsevier Ltd. All rights reserved.