# The decay curves of luminescence from Eu<sup>2+</sup> in β-SiAlON are effectively analyzed using the general-order kinetics formula

https://mdr.nims.go.jp/datasets/8278aacb-1853-4393-b041-bab4d38f8206

## File

- [bSiAlONdecay_revised.pdf](https://mdr.nims.go.jp/filesets/dfc400ef-cd90-40ee-bb04-ce0554891319/download) ([Detail](https://mdr.nims.go.jp/filesets/dfc400ef-cd90-40ee-bb04-ce0554891319.md))

## Id

8278aacb-1853-4393-b041-bab4d38f8206

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-10-24T04:58:33.552439Z

## Updated at

2025-02-07T03:30:36.573177Z

## Published at

2025-02-07T03:30:36.719036Z

## Doi

https://doi.org/10.48505/nims.4893

## First published url

https://doi.org/10.1088/1361-6463/ad2294

## Date published

2024-05-03

## Recorded date published

2024-5-3

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: The decay curves of luminescence from Eu<sup>2+</sup> in β-SiAlON are effectively
    analyzed using the general-order kinetics formula
  title_type: original
  lang: en

## Description

- description: "Defects in phosphors affect not only luminescence intensity but also
    emission peak width, decay time, and afterglow. The green phosphor β-SiAlON:Eu2+
    exhibits the green emission of Eu2+ at 520 nm and the blue emission of nitrogen
    vacancies at 460 nm in time-resolved fluorescence measurements. The decay time
    of the intrinsic Eu2+ transition is 0.7 us, but afterglow is detected from 50
    us to 0.01 s. This afterglow decay curve is the same for the green emission of
    Eu2+ and the blue emission of nitrogen vacancies, suggesting that the defect levels
    of the nitrogen vacancies affect the Eu2+ transition. The afterglow decay curves
    were analyzed using the formula of the general-order kinetics, (1 + \U0001D461/\U0001D70FB)−\U0001D45B,
    where \U0001D45B is the decay power and \U0001D70FB is the decay time. This equation
    is generally used when analyzing afterglow on the order of seconds to hours but
    has not been examined systematically applied in samples with different temperatures
    and concentrations on the order of nanoseconds to milliseconds.The decay power
    \U0001D45B is approximately 1 for all Eu2+ concentrations (x = 0.001 to 0.3) and
    undoped β-SiAlON. The decay time \U0001D70FB is correlated with the density of
    the nitrogen vacancies determined by electron spin resonance. Furthermore, the
    value of \U0001D45B is approximately 1 for 50 us to 0.01 s and 0.3 for 1–1000
    s. Thus, the luminescence mechanism of Eu2+ can be discussed by comparing \U0001D45B
    and \U0001D70FB obtained form the decay curves. In addition, several different
    Eu2+ -doped phosphors, namely SrAl2O4:Eu2+, Dy3+, CaAlSiN3:Eu2+, and CaS:Eu2+,
    Tm3+, are studied."
  description_type: abstract
  lang: und

## Creator

- name: Yoriko Suda
  role: author
- name: Tsuyoshi Okuno
  role: author
- name: Takashi Takeda
  role: author
  orcid: https://orcid.org/0000-0003-2510-4562
  organization: National Institute for Materials Science
- name: Kohsei Takahashi
  role: author
  orcid: https://orcid.org/0000-0002-6443-1534
  organization: National Institute for Materials Science
- name: Naoto Hirosaki
  role: author
  orcid: https://orcid.org/0000-0001-9218-9557
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: luminescence
  schema: not_defined
- subject: decay curve
  schema: not_defined
- subject: afterglow
  schema: not_defined
- subject: phosphor
  schema: not_defined
- subject: SiAlON
  schema: not_defined
- subject: europium
  schema: not_defined

## Rights

- description: 'This is the Accepted Manuscript version of an article accepted for
    publication in Journal of Physics D: Applied Physics.  IOP Publishing Ltd is not
    responsible for any errors or omissions in this version of the manuscript or any
    version derived from it.  The Version of Record is available online at https://dx.doi.org/10.1088/1361-6463/ad2294'
  identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-02-07
end_date: 2025-02-07

## Journal

- title: 'Journal of Physics D: Applied Physics'
  issn: '13616463'
  volume: '57'
  issue: '18'
  article_number: '185101'

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## Fileset

- id: dfc400ef-cd90-40ee-bb04-ce0554891319
  filename: bSiAlONdecay_revised.pdf
  content_type: application/pdf
  size: 1556609
  md5: 7ab71cb9965dc93ba587c2c1bdb59043

## Thumbnail

fileset_id: dfc400ef-cd90-40ee-bb04-ce0554891319
filename: bSiAlONdecay_revised.pdf