Large scale synthesis of full-color emissive carbon dots from a single carbon source by a solvent-free method

量子产额 光致发光 碳纤维 材料科学 发光二极管 产量(工程) 二极管 发光 色温 化学工程 光化学 溶剂 量子点 化学 光电子学 荧光 有机化学 光学 复合材料 工程类 物理 冶金 复合数
作者
Hui Ding,Xuanxuan Zhou,Zi‐Hui Zhang,Yun‐Peng Zhao,Jishi Wei,Huan-Ming Xiong
出处
期刊:Nano Research [Springer Science+Business Media]
卷期号:15 (4): 3548-3555 被引量:110
标识
DOI:10.1007/s12274-021-3891-0
摘要

Full-color emissive carbon dots (CDs) hold a great promise for various applications, especially in light emitting diodes (LEDs). However, the existing synthetic routes for CDs are carried out in solutions, which suffer from low yields, high pressures, various byproducts, large amounts of waste solvents, and complicated photoluminescence (PL) origins. Therefore, it is necessary to explore large scale synthesis of CDs with high quantum yield (QY) across the entire visible range from a single carbon source by a solvent-free method. In this work, a series of CDs with tunable PL emission from 442 to 621 nm, QY of 23%–56%, and production yield within 34%–72%, are obtained by heating o-phenylenediamine with the catalysis of KCl. Detailed characterizations identify that, the differences between these CDs with respect to the graphitization degree, graphitic nitrogen content, and oxygen-containing functional groups, are responsible for their distinct optical properties, which can be modulated by controlling the deamination and dehydrogenation processes during reactions. Blue, green, yellow, red emissive films, and LEDs are prepared by dispersing the corresponding CDs into polyvinyl alcohol (PVA). All types of white LEDs (WLEDs) with high colorrendering- index (CRI), including warm WLEDs, standard WLEDs, and cool WLEDs, are also fabricated by mixing the red, green, and blue emissive CDs into PVA matrix by the appropriate ratios.
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