Article Generated White Light Having Adaptable Chromaticity and Emission, Using Spectrally Reconfigurable Microcavities

Barun Kumar Barman SAMURAI ORCID (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Photonics Nano Engineering Group, National Institute for Materials ScienceROR) ; David Hernández-Pinilla (International Center for Materials Nanoarchitectonics/Nano-System Field/Photonics Nano-Engineering Group, National Institute for Materials ScienceROR) ; Ovidiu Cretu SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Electron Microscopy Group, National Institute for Materials ScienceROR) ; Jun Kikkawa SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Electron Microscopy Group, National Institute for Materials ScienceROR) ; Koji Kimoto SAMURAI ORCID (Center for Basic Research on Materials/Advanced Materials Characterization Field/Electron Microscopy Group, National Institute for Materials ScienceROR) ; Tadaaki Nagao SAMURAI ORCID (Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials Field/Photonics Nano Engineering Group, National Institute for Materials ScienceROR)

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Barun Kumar Barman, David Hernández-Pinilla, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Tadaaki Nagao. Generated White Light Having Adaptable Chromaticity and Emission, Using Spectrally Reconfigurable Microcavities. Advanced Science. 2024, (), 2407090. https://doi.org/10.1002/advs.202407090
SAMURAI

Description:

(abstract)

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.

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Keyword: chromaticity converter, carbon dots, rare-earth free, multilayer

Date published: 2024-09-04

Publisher: Wiley-Blackwell

Journal:

  • Advanced Science (ISSN: 21983844) 2407090

Funding:

  • JST JPMJCR13C3
  • JSPS 24K17589

Manuscript type: Author's version (Accepted manuscript)

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

First published URL: https://doi.org/10.1002/advs.202407090

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Updated at: 2024-10-28 16:30:24 +0900

Published on MDR: 2024-10-28 16:30:25 +0900

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