基于近场限制的烧结碳点二氧化钛结构的定向白光发射。

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

作者信息

Wang Dalei, Han Xiaoxia, Wang Hao, Li Zenan, Chen Zhaomin, Yang Qing, Yang Mingcheng, Zhang Zexin, Zhu Yizhi, Tong Jintao, Lin Jie, Huang Jingsong, Luo Daping, Wang Tao, Liu Wei, Li Wenxue, Xu Chunxiang, Dong Bin, Kang Zhenhui

机构信息

State Key Laboratory of Bioinspired Interfacial Materials Science, Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM) and State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Soochow University, Suzhou, China.

College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Hangzhou, China.

出版信息

Nat Commun. 2025 Jul 1;16(1):5651. doi: 10.1038/s41467-025-60838-7.

DOI:10.1038/s41467-025-60838-7

PMID:40595552

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12215850/

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.

摘要

定向光源不仅有助于推动科学进步，而且在许多应用领域都具有巨大潜力。然而，在不使用光学元件的情况下实现定向白光仍然具有挑战性。在此，我们报道了一种由1064纳米近红外激光驱动的高定向白光发射器，其立体角为1/60，无需引入光学元件。该发射器由二元组分即碳点和二氧化钛组成，在合成过程中具有微透镜形状的表面。在近红外光激发下，碳点基于一种根本不同的机制发射白光，这可能涉及类似于韧致辐射、多光子和热过程的过程。由于限制效应，发射的白光随后在近场中由微透镜形状的表面调节，从而产生高方向性。这种高定向白光发射器表现出优异的稳定性和可重复性，使其在包括靶向照明和投影等应用中具有广阔前景。