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Metal-free, luminescent, carbogenic nanomaterials (LCNMs) constitute a novel class of optical materials with　low environmental impact. LCNMs, e.g., carbon dots (CDs), graphitic carbon nitride (g-C3N4), and carbonized　polymer microspheres (CPM) show strong blue/cyan emissions, but rather weak yellow/red emission. This　has been a serious drawback in applying them to light-emitting and bio-imaging applications. Here, by　integrating single-component LCNMs in photonic microcavities, the study spectroscopically engineers the　coupling between photonic modes in these microcavities and optical transitions to “reconfigure” the emission　spectra of these luminescent materials. Resonant photons are confined in the microcavity, which allows　selective re-excitation of phosphors to effectively emit down-converted photons. The down-converted photons re-excite the phosphors and are multiply recycled, leading to enhanced yellow/red emissions and resulting in white-light emission (WLE). Furthermore, by adjusting photonic stop bands of microcavity components, color adaptable (cool, pure, and warm) WLE is flexibly generated, which precisely follows the black-body Planckian locus in the chromaticity diagram. The proposed approach offers practical low-cost chromaticity-adjustable WLE from single-component, luminescent materials without any chemical or surface modification, or　elaborate machinery and processing, paving the way for practical WLE devices.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: chromaticity converter, carbon dots, rare-earth free, multilayer

刊行年月日: 2024-09-04

出版者: Wiley-Blackwell

掲載誌:

• Advanced Science (ISSN: 21983844) 2407090

研究助成金:

• JST JPMJCR13C3
• JSPS 24K17589

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4905

公開URL: https://doi.org/10.1002/advs.202407090

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更新時刻: 2024-10-28 16:30:24 +0900

MDRでの公開時刻: 2024-10-28 16:30:25 +0900