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Fluorescent Carbon Quantum Dots as Single Light Converter for White LEDs

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Abstract

Synthesis of fluorescent carbon quantum dots (CQDs) as single light converter and their application in white light-emitting diodes (LEDs) are reported. CQDs were prepared by a one-step hydrothermal method using glucose and polyethylene glycol 200 as precursors. The structural and optical properties of the CQDs were investigated. The CQDs with uniform size of 4 nm possessed typical excitation-dependent emission wavelength and quantum yield of 3.5%. Under ultraviolet illumination, the CQDs in deionized water emitted bright blue fluorescence and produced broad visible-light emission with high red, green, and blue spectral component ratio of 63.5% (red-to-blue intensity to total intensity), suggesting great potential as single light converter for white LEDs. To demonstrate their potential, a white LED using CQDs as a single light converter was built. The device exhibited cool white light with corresponding color temperature of 5584 K and color coordinates of (0.32, 0.37), belonging to the white gamut. This research suggests that CQDs could be a promising candidate single light converter for white LEDs.

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Acknowledgements

We thank the International Science & Technology Cooperation Program of China (2012DFR50460), the National Natural Science Foundation of China (21176169), and Shanxi Provincial Key Innovative Research Team in Science and Technology (2015013002-10) for financial support.

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Authors and Affiliations

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

    Xiaoting Feng, Feng Zhang, Yaling Wang, Yi Zhang, Yongzhen Yang & Xuguang Liu

  2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Xiaoting Feng & Xuguang Liu

  3. Research Center on Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China

    Feng Zhang, Yaling Wang & Yongzhen Yang

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

    Yi Zhang

Authors
  1. Xiaoting Feng
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  2. Feng Zhang
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  3. Yaling Wang
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  4. Yi Zhang
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  5. Yongzhen Yang
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Correspondence to Yongzhen Yang or Xuguang Liu.

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Feng, X., Zhang, F., Wang, Y. et al. Fluorescent Carbon Quantum Dots as Single Light Converter for White LEDs. J. Electron. Mater. 45, 2784–2788 (2016). https://doi.org/10.1007/s11664-016-4407-7

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  • DOI: https://doi.org/10.1007/s11664-016-4407-7

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