# Stabilizing cubic γ-Ga<sub>2</sub>O<sub>3</sub>:Cr<sup>3+</sup> spinel nanocrystals by size confinement into mesoporous silica nanoreactor channels

https://mdr.nims.go.jp/datasets/f4b435b7-02fb-4044-bb53-c319e75d4f75

## File

- [d4tc01386g.pdf](https://mdr.nims.go.jp/filesets/b6ae501e-8547-4307-9f5f-545a03f824c3/download) ([Detail](https://mdr.nims.go.jp/filesets/b6ae501e-8547-4307-9f5f-545a03f824c3.md))

## Id

f4b435b7-02fb-4044-bb53-c319e75d4f75

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-10-10T02:00:04.678103Z

## Updated at

2024-10-10T07:31:07.919409Z

## Published at

2024-10-10T07:31:07.992868Z

## Doi



## First published url

https://doi.org/10.1039/d4tc01386g

## Date published

2024-06-18

## Recorded date published

2024-7-25

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Stabilizing cubic γ-Ga<sub>2</sub>O<sub>3</sub>:Cr<sup>3+</sup> spinel nanocrystals
    by size confinement into mesoporous silica nanoreactor channels
  title_type: original
  lang: en

## Description

- description: In recent years, Cr3+-activated phosphors have been attracting a lot
    of interest due to their unique optical features that can be exploited for applications
    ranging from lasers to optical thermometry, near-infrared (NIR) emitting phosphors
    for bioimaging and NIR-LEDs, to name a few. Despite the interesting optical properties
    shown by Cr3+-doped Ga2O3, investigations are limited only to β-Ga2O3 and α-Ga2O3
    polymorphs. Using mesoporous silica particles with different pore sizes between
    3 nm and 22 nm as nanoreactors, cubic γ-Ga2O3:Cr3+ spinel nanocrystals (NCs) are
    stabilized through confinement into the mesopores as confirmed by HR-TEM, XRPD
    and the photoluminescence spectral shape. A detailed spectroscopic investigation
    in the temperature range between 16 to 500 K allowed extrapolating the fundamental
    parameters in the framework of the Tanabe–Sugano diagram and comparing the values
    for Cr3+ in γ-Ga2O3 with the α- and β-phases. In addition, due to the confinement
    of the NCs into the silica structure, the phase transition to the β-phase, conventionally
    occurring at about 700 °C, is hindered up to 1000 °C, improving the stability
    of the γ-Ga2O3 phase.
  description_type: abstract
  lang: und

## Creator

- name: Michele Crozzolin
  role: author
  orcid: https://orcid.org/0009-0007-3314-9118
- name: Camilla Belloni
  role: author
  orcid: https://orcid.org/0009-0007-7608-2419
- name: Jian Xu
  role: author
  orcid: https://orcid.org/0000-0002-1040-5090
- name: Takayuki Nakanishi
  role: author
  orcid: https://orcid.org/0000-0003-3412-2842
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Jumpei Ueda
  role: author
- name: Setsuhisa Tanabe
  role: author
  orcid: https://orcid.org/0000-0002-7620-0119
- name: Federico Dallo
  role: author
- name: Eleonora Balliana
  role: author
  orcid: https://orcid.org/0000-0003-2082-0498
- name: Asia Saorin
  role: author
  orcid: https://orcid.org/0000-0002-4312-7795
- name: Flavio Rizzolio
  role: author
  orcid: https://orcid.org/0000-0002-3400-4363
- name: Davide Cristofori
  role: author
  orcid: https://orcid.org/0000-0002-1041-2282
- name: Pietro Riello
  role: author
  orcid: https://orcid.org/0000-0002-6087-3802
- name: Alvise Benedetti
  role: author
  orcid: https://orcid.org/0000-0002-5579-6312
- name: Michele Back
  role: author
  orcid: https://orcid.org/0000-0003-1121-9414

## Contact agent



## Publisher

organization: Royal Society of Chemistry (RSC)

## Managing organization



## Keyword

- subject: nanocrystals
  schema: not_defined
- subject: luminescence
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Materials Chemistry C
  issn: '20507526'
  volume: '12'
  issue: '29'
  start_page: 10929
  end_page: 10941

## Conference



## Related item



## Funding

- identifier: CATHENA project
  funder_name: Programma Operativo Nazionale Ricerca e Competitività
- identifier: 'CUP: J34I17000010006'
  funder_name: Programma Operativo Nazionale Ricerca e Competitività
- identifier: S22088
  funder_name: Japan Society for the Promotion of Science

## 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



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## Thumbnail

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filename: d4tc01386g.pdf