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説明:

Single-component, metal-free white light emitters with integrated photonic functionalities are highly attractive for solid-state lighting and integrated photonic applications. Here, we report carbonized polymer microspheres that exhibit efficient singlecomponent white light emission (WLE) together with excitation-tunable visible-to-nearinfrared (VIS-NIR) whispering gallery mode (WGM) emission. The microspheres are synthesized via a hydrothermal crosslinking reaction between the natural peptide ε-poly-Llysine and citric acid, yielding smooth microcavities with bright cyan emission. Incorporation of ortho-phenylenediamine (OPD) during synthesis enables control over the internal structure and promotes the in-situ formation of phenazine-like polycyclic aromatic hydrocarbon (PAH) domains. The extended π-conjugation of the PAHs enhances visible-light absorption, leading to emission spanning the visible to NIR spectral region. Upon ultraviolet excitation, the microspheres exhibit broadband single-component WLE arising from efficient intracavity energy transfer. The smooth spherical morphology and heterogeneous aromatic domains provide strong optical confinement and excitation wavelength dependent emission, resulting in amplified spontaneous emission mediated by WGM resonances. By varying the excitation wavelength, WGM-assisted emission spanning the entire VIS-NIR spectral region is achieved. This work introduces a rare-earth-and metal-free carbonized polymer microcavity platform that integrates WLE with tunable WGM amplification, offering new opportunities for multifunctional optoelectronic and photonic devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Carbonized polymer microspheres, white light emission, near-infrared, whispering gallery mode, microcavities, amplified spontaneous emission

刊行年月日: 2026-09-04

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• RSC Applied Interfaces (ISSN: 27553701)

研究助成金:

• Japan Society for the Promotion of Science 24K17589

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.8638

公開URL: https://doi.org/10.1039/d6lf00065g

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更新時刻: 2026-10-05 19:33:08 +0900

MDRでの公開時刻: 2026-10-06 10:22:54 +0900