# Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic Encryption from Visible to Infrared Wavelengths

https://mdr.nims.go.jp/datasets/be54385f-e39a-4d98-827c-8ed36d6a2570

## File

- [VIS_NIR_barcodes_MDR.pdf](https://mdr.nims.go.jp/filesets/06296208-593a-4235-b702-fce7bc791471/download) ([Detail](https://mdr.nims.go.jp/filesets/06296208-593a-4235-b702-fce7bc791471.md))

## Id

be54385f-e39a-4d98-827c-8ed36d6a2570

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-09-02T02:05:37.635084Z

## Updated at

2026-09-02T02:53:36.652584Z

## Published at

2026-09-02T05:28:30.099652Z

## Doi

https://doi.org/10.48505/nims.6497

## First published url

https://doi.org/10.1002/adom.202503855

## Date published

2026-04-30

## Recorded date published

2026-5

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic
    Encryption from Visible to Infrared Wavelengths
  title_type: original
  lang: en

## Description

- description: Whispering-gallery-mode (WGM)-mediated light emission produces sharp
    and distinct resonant peaks, providing a unique spectral signature that is ideal
    for photonic barcoding and compact microtagging. However, existing photonic barcodes
    are typically limited to visible wavelengths, restricting their tagging potential.
    Achieving precise light-emission control across the entire Vis–near-IR (NIR) spectral
    range is challenging, particularly when using a single object composed of a single
    material. Herein, multicolor-emitting carbonized polymer microbeads (MECPMs) are
    synthesized on a gram scale by a facile and scalable hydrothermal process. These
    spherical microbeads, which contain extended π-conjugated polycyclic aromatic
    hydrocarbons within their microcavities, emit broadband light spanning the entire
    Vis–NIR spectrum. Owing to their excitation-dependent photoluminescence, a single
    MECPM can produce color-tunable WGM-based white-light emission across the Vis–NIR
    spectrum, thereby enabling the generation of both visible and invisible microbarcodes
    by adjusting the excitation wavelength. Compared with conventional polymer- or
    oxide-based microcavities, MECPMs demonstrate enhanced chemical stability in acids
    and organic solvents, excellent spectral tunability, and outstanding photonic
    encryption capabilities. Their environmentally friendly, metal-free “chameleonic”
    photonic functionality provides a robust platform for anticounterfeiting, microtagging,
    labeling, and next-generation photonic security systems. Additionally, this invention
    facilitates photonic encryption via information encoding and transmission across
    the Vis–NIR spectral range.
  description_type: abstract
  lang: und

## Creator

- name: Barun Kumar Barman
  role: author
  orcid: https://orcid.org/0000-0002-9894-1890
  organization: National Institute for Materials Science
- name: Keisuke Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-4285-2135
  organization: National Institute for Materials Science
- name: Kenzo Deguchi
  role: author
- name: Shinobu Ohki
  role: author
  orcid: https://orcid.org/0000-0002-7357-3833
  organization: National Institute for Materials Science
- name: Kenjiro Hashi
  role: author
  orcid: https://orcid.org/0000-0002-0320-4768
  organization: National Institute for Materials Science
- name: Atsushi Goto
  role: author
  orcid: https://orcid.org/0000-0002-9472-4098
  organization: National Institute for Materials Science
- name: Tadaaki Nagao
  role: author
  orcid: https://orcid.org/0000-0002-6746-2686
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: Microresonator
  schema: not_defined
- subject: photoluminescence
  schema: not_defined
- subject: near infrared
  schema: not_defined
- subject: microbarcodes
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2026-04-30

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Advanced Optical Materials
  issn: '21951071'
  start_page: 14
  end_page: 19
  article_number: e03855

## Conference



## Related item



## Funding

- identifier: 24K17589
  funder_name: JSPS
  description: 科研費

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Custom property



## Fileset

- id: '06296208-593a-4235-b702-fce7bc791471'
  filename: VIS_NIR_barcodes_MDR.pdf
  content_type: application/pdf
  size: 2028164
  md5: 3d1137c5f02f605dcfc5fed63f127b35

## Thumbnail

fileset_id: '06296208-593a-4235-b702-fce7bc791471'
filename: VIS_NIR_barcodes_MDR.pdf