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Directional white-light emission from sintered carbon dot titanium dioxide structures based on near-field confinement

Author

Listed:
  • Dalei Wang

    (Soochow University
    Zhejiang A&F University)

  • Xiaoxia Han

    (Soochow University)

  • Hao Wang

    (Soochow University)

  • Zenan Li

    (Soochow University)

  • Zhaomin Chen

    (Soochow University)

  • Qing Yang

    (Chinese Academy of Sciences)

  • Mingcheng Yang

    (Chinese Academy of Sciences)

  • Zexin Zhang

    (Soochow University)

  • Yizhi Zhu

    (Southeast University)

  • Jintao Tong

    (Soochow University)

  • Jie Lin

    (Oxford Suzhou Centre for Advanced Research)

  • Jingsong Huang

    (Oxford Suzhou Centre for Advanced Research)

  • Daping Luo

    (East China Normal University)

  • Tao Wang

    (Soochow University)

  • Wei Liu

    (Zhejiang A&F University)

  • Wenxue Li

    (East China Normal University)

  • Chunxiang Xu

    (Southeast University)

  • Bin Dong

    (Soochow University)

  • Zhenhui Kang

    (Soochow University
    Macau University of Science and Technology)

Abstract

Directional light source not only helps to advance scientific progresses but also has great potentials in many application fields. However, it is still challenging to achieve the directional white light without optical elements. Here, we report a highly directional white-light emitter driven by 1064 nm near-infrared laser with 1/60 solid angle that does not require the introduction of optical elements. The emitter which consists of binary components, i.e. carbon dot and titanium oxide, possesses a microlens-shape surface formed during the synthesis process. Upon near-infrared light excitation, carbon dot emits white light based on a fundamentally different mechanism, which may involve a process similar to bremsstrahlung, multiphoton and thermal processes. The emitted white light is then regulated in the near field by the microlens-shape surface due to the confinement effect, resulting in the high directionality. The highly directional white-light emitter exhibits excellent stability and repeatability, making it promising for applications including targeted illumination and projection.

Suggested Citation

  • Dalei Wang & Xiaoxia Han & Hao Wang & Zenan Li & Zhaomin Chen & Qing Yang & Mingcheng Yang & Zexin Zhang & Yizhi Zhu & Jintao Tong & Jie Lin & Jingsong Huang & Daping Luo & Tao Wang & Wei Liu & Wenxue, 2025. "Directional white-light emission from sintered carbon dot titanium dioxide structures based on near-field confinement," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60838-7
    DOI: 10.1038/s41467-025-60838-7
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    References listed on IDEAS

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