【摘 要】
：
Carbon dots (CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.However,the development of near-infrare
【机 构】
：
Green Catalysis Center,College of Chemistry,Zhengzhou University,Zhengzhou 450001,China;State Key La
论文部分内容阅读
Carbon dots (CDs),as a kind of carbon nanomaterials,have attracted widespread attention due to their unique structure and excellent optical properties,and they are low-cost,environmentally friendly and biocompatible.However,the development of near-infrared (NIR) emission CDs remains a challenge.In this study,we successfully prepared CDs with a maximum emission of 714 nm using citric acid as the carbon source,thiourea and ammonium fluoride as the dopant source,and N,N-di-methylformamide as the solvent.The quantum yield (QY) is as high as 22.64％.Interestingly,the prepared CDs self-oxidize in the presence of oxygen,resulting in a blue shift of their emission.Therefore,they can be used to prepare white light-emitting diodes (WLEDs) without adding other fluorescent substances.Notably,the work presented herein constitutes the first report of WLEDs preparation from single CDs.
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