荧光
发光
蓝移
堆积
光化学
聚集诱导发射
材料科学
纳米材料
碳纤维
分子内力
荧光粉
化学工程
化学
光致发光
纳米技术
有机化学
光电子学
工程类
物理
复合数
复合材料
量子力学
作者
Haiyao Yang,Yingliang Liu,Zhouyi Guo,Bingfu Lei,Jianle Zhuang,Xuejie Zhang,Zhiming Liu,Chaofan Hu
标识
DOI:10.1038/s41467-019-09830-6
摘要
Carbon dots (CDs) have been studied for years as one of the most promising fluorescent nanomaterials. However, CDs with red or solid-state fluorescence are rarely reported. Herein, through a one-pot solvothermal treatment, hydrophobic CDs (H-CDs) with blue dispersed emission and red aggregation-induced emission are obtained. When water is introduced, the hydrophobic interaction leads to aggregation of the H-CDs. The formation of H-CD clusters induces the turning off of the blue emission, as the carbonized cores suffer from π-π stacking interactions, and the turning on of the red fluorescence, due to restriction of the surfaces' intramolecular rotation around disulfide bonds, which conforms to the aggregation-induced-emission phenomenon. This on-off fluorescence of the H-CDs is reversible when the H-CD powder is completely dissolved. Moreover, the H-CD solution dispersed in filter paper is nearly colorless. Finally, we develop a reversible two switch-mode luminescence ink for advanced anti-counterfeiting and dual-encryption.
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