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Realization of solid-state red fluorescence and concentration-induced multicolor emission from N, B co-doped carbon dots

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Abstract

As a new type of luminescent material, carbon dots (CDs) have attracted increased attention for their superior optical properties in recent years. However, solid-state fluorescent CDs, especially with red emission, are still a major challenge. Here, CDs with solid-state red emission were synthesized by co-doping of N and B using the one-step microwave method. The CD powder exhibits excitation-independent solid-state red fluorescence without any dispersion matrices, with optimum solid-state fluorescence wavelength of 623 nm. The hydrogen bonding interaction in CDs is helpful for solid-state fluorescence of CDs. The IG/ID value of CDs reaches up to 3.49, suggesting their very high graphitization degree, which is responsible for their red emission. In addition, CDs show the concentration-induced multicolor emission, which is attributed to the decreased energy gap in the high concentrated CD solution. To exploit their concentration-dependent emission, CDs with changing ratio in matrices are applied as a color-converting layer on ultraviolet chip to fabricate multicolor light-emitting diodes with light coordinates of (0.33, 0.38), (0.41, 0.48), (0.49, 0.44), and (0.67, 0.33), which belong to green, yellow, orange, and red light, respectively.

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Acknowledgements

This work was financially supported by the Foundation Research Project of Shanxi Province (Grant Nos. 202103021223007, 20210302123164, and 20210302124604), the National Natural Science Foundation of China (Grant No. 51972221), the Research Project Supported by Shanxi Scholarship Council of China (Grant Nos. 2020-051 and HGKY2019027), the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (Grant No. 2019L0946), and the Key Research Program of Lyuliang City (Grant No. GXZDYF2019087).

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Authors and Affiliations

  1. Department of Materials and Chemical Engineering, Taiyuan University, Taiyuan, 030032, China

    Junli Wang & Juanzhi Yan

  2. Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education), Taiyuan University of Technology, Taiyuan, 030024, China

    Junli Wang, Jingxia Zheng, Qiang Li & Yongzhen Yang

  3. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China

    Pinyi He

  4. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Xuguang Liu

  5. Department of Chemistry and Chemical Engineering, Lyuliang University, Lyuliang, 033001, China

    Yi Zhang

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  1. Junli Wang
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Correspondence to Junli Wang or Yongzhen Yang.

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11706_2023_648_MOESM1_ESM.pdf

Realization of solid-state red fluorescence and concentration-induced multicolor emission from N, B co-doped carbon dots

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Wang, J., Zheng, J., He, P. et al. Realization of solid-state red fluorescence and concentration-induced multicolor emission from N, B co-doped carbon dots. Front. Mater. Sci. 17, 230648 (2023). https://doi.org/10.1007/s11706-023-0648-6

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  • DOI: https://doi.org/10.1007/s11706-023-0648-6

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