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One‐pot synthesis of carbon dots@ZrO2 nanoparticles with tunable solid‐state fluorescence
Authors:Zhongyang Wang  Ali Hasnain  Xujun Sun  Ying Han  Dongshun Liu  Xiaohua Tan  Xiang‐Kui Ren  Yakai Feng
Abstract:In recent years, fluorescent carbon dots (CDs) have been developed and showed potential applications in biomedical imaging and light‐emitting diodes (LEDs) for their excellent fluorescent properties. However, it still remains a challenge to incorporate fluorescent CDs into the host matrix in situ to overcome their serious self‐quenching. Herein, a one‐pot hydrothermal method is used to prepare nano‐zirconia with CDs (CDs@ZrO2) nanoparticles. During the reaction, CDs and nano‐zirconia are generated simultaneously and connected with silane coupling agent. The CDs@ZrO2 nanoparticles exhibit tunable emission wavelength from 450 to 535 nm emission by regulating the content of citric acid in the feed. The quantum yield of the CDs@ZrO2 is up to 23.8%. Furthermore, the CDs@ZrO2 nanoparticles with regulable fluorescence emission can be used for the fluorescent material to prepare white LEDs. The prepared LED has significant white light emission with color coordinates of (0.30, 0.37) and its color rendering index (CRI) is 67.1. In summary, we have developed the solid‐state CDs@ZrO2 nanoparticles with tunable emission by a valuable strategy, that is, one‐pot method, for white LEDs.
Keywords:carbon dots  nanoparticles  nano‐zirconia  solid‐state fluorescence  white light‐emitting diodes
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