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

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 Li, Chunxiang Xu, Bin Dong () and Zhenhui Kang ()
Additional contact information
Dalei Wang: Soochow 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

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-60838-7

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