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Energy structure and fluorescence of Eu2+ in ZnS:Eu nanoparticles

Chen, Wei ; Malm, Jan-Olle LU ; Zwiller, Valéry LU ; Huang, Yining ; Liu, Shuman ; Wallenberg, Reine LU ; Bovin, Jan-Olov LU and Samuelson, Lars LU (2000) In Physical Review B 61(16). p.11021-11024
Abstract
Eu2+-doped ZnS nanoparticles with an average size of around 3 nm were prepared, and an emission band around 530 nm was observed. By heating in air at 150 degrees C, this emission decreased, while the typical sharp line emission of Eu3+ increased. This suggests that the emission around 530 nm is from intraion transition of Eu2+: In bulk ZnS:Eu2+, no intraion transition of Eu2+ was observed because the excited states of Eu2+ are degenerate with the continuum of the ZnS conduction band. We show that the band gap in ZnS:Eu2+ nanoparticles opens up due to quantum confinement, such that the conduction band of ZnS is higher than the first excited state of Eu2+, thus enabling the intraion transition of Eu2+ to occur.
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
61
issue
16
pages
4 pages
publisher
American Physical Society
external identifiers
  • scopus:0000693346
ISSN
1098-0121
DOI
10.1103/PhysRevB.61.11021
language
English
LU publication?
yes
id
74d6f9a7-9c8a-4a6d-97d3-185066d9352f
date added to LUP
2023-10-31 16:21:07
date last changed
2023-11-02 13:43:08
@article{74d6f9a7-9c8a-4a6d-97d3-185066d9352f,
  abstract     = {{Eu2+-doped ZnS nanoparticles with an average size of around 3 nm were prepared, and an emission band around 530 nm was observed. By heating in air at 150 degrees C, this emission decreased, while the typical sharp line emission of Eu3+ increased. This suggests that the emission around 530 nm is from intraion transition of Eu2+: In bulk ZnS:Eu2+, no intraion transition of Eu2+ was observed because the excited states of Eu2+ are degenerate with the continuum of the ZnS conduction band. We show that the band gap in ZnS:Eu2+ nanoparticles opens up due to quantum confinement, such that the conduction band of ZnS is higher than the first excited state of Eu2+, thus enabling the intraion transition of Eu2+ to occur.}},
  author       = {{Chen, Wei and Malm, Jan-Olle and Zwiller, Valéry and Huang, Yining and Liu, Shuman and Wallenberg, Reine and Bovin, Jan-Olov and Samuelson, Lars}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{16}},
  pages        = {{11021--11024}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Energy structure and fluorescence of Eu<sup>2+</sup> in ZnS:Eu nanoparticles}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.61.11021}},
  doi          = {{10.1103/PhysRevB.61.11021}},
  volume       = {{61}},
  year         = {{2000}},
}