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Near-Ultraviolet To Near-Infrared Fluorescent Nitrogen-Doped Carbon Dots With Two-Photon And Piezochromic Luminescence.
Y. Zhan, T. Geng, Yingliang Liu, Chaofan Hu, Xuejie Zhang, B. Lei, Jianle Zhuang, Xu Wu, Di Huang, Guanjun Xiao, Bo Zou
Published 2018 · Materials Science, Medicine
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Carbon dots (CDs) have gained intensive interests owing to their unique structure and excellent optoelectronic performances. However, to acquire CDs with a broadband emission spectrum still remains an issue. In this work, nitrogen-doped CDs (N-CDs) with near-ultraviolet (NUV), visible, and near-infrared (NIR) emission were synthesized via one-pot solvothermal strategy, and the excitation-independent NUV and NIR emission and excitation-dependent visible emission were observed in the photoluminescence (PL) spectra of N-CDs. Moreover, the as-synthesized N-CDs displayed two-photon fluorescence emission. It is important to note that N-CDs also exhibited piezochromic luminescence with reversibility, in which the red- and blue-shifted PL with increasing applied pressure (0.07-5.18 GPa) and the red- and blue-shifted PL with releasing applied pressure (5.18 GPa to 1 atm) were developed for the first time. Combined with good hydrophilicity, high photobleaching resistance, and low toxicity, the piezochromic luminescence would greatly boost the valuable applications of N-CDs.
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