Characterization of Mn2+ coordination states in ZnS nanocrystal by EPR spectroscopy and related photoluminescence properties

T. Igarashi, M. Ihara, T. Kusunoki, K. Ohno, Tetsuhiko Isobe, M. Senna

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Coordination states of Mn2+ inside and near the surface of ZnS:Mn nanocrystal (NC) (ca. 1.8 nm in particle radius) coated with poly(acrylic acid) (PAA) were examined by the detailed analysis of electron paramagnetic resonance (EPR). The symmetry of both Mn2+ sites inside and near the surface of NC is lower than that of submicron particles (0.125 μm in particle radius), because of larger lattice distortion and larger zero field splitting constant. Temperature dependence of line width (ΔHpp) of EPR signals from Mn2+ inside and near surface sites of ZnS:Mn disappears when the particle radius of ZnS:Mn decreases from 0.125 μm to 1.8nm. These indicate increasing extent of d-d transition and stronger interaction between Mn2+ and ZnS as well as between Mn2+ and PAA in NC, leading to more effective energy transfer from ZnS and PAA to Mn2+. These phenomena explain the high luminescence intensity of ZnS:Mn nanocrystal coated with PAA.

Original languageEnglish
Pages (from-to)51-56
Number of pages6
JournalJournal of Nanoparticle Research
Volume3
Issue number1
DOIs
Publication statusPublished - 2001

Fingerprint

Electron Paramagnetic Resonance
Nanocrystals
Photoluminescence
Paramagnetic resonance
Spectroscopy
electron paramagnetic resonance
nanocrystals
photoluminescence
carbopol 940
Radius
spectroscopy
radii
Splitting Field
Luminescence
Linewidth
acrylic acid
Energy Transfer
Temperature Dependence
Energy transfer
Acrylics

Keywords

  • Coated particles
  • Luminescence
  • Measurements
  • Nanocrystals
  • Quantum confinement

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Characterization of Mn2+ coordination states in ZnS nanocrystal by EPR spectroscopy and related photoluminescence properties. / Igarashi, T.; Ihara, M.; Kusunoki, T.; Ohno, K.; Isobe, Tetsuhiko; Senna, M.

In: Journal of Nanoparticle Research, Vol. 3, No. 1, 2001, p. 51-56.

Research output: Contribution to journalArticle

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AU - Ihara, M.

AU - Kusunoki, T.

AU - Ohno, K.

AU - Isobe, Tetsuhiko

AU - Senna, M.

PY - 2001

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N2 - Coordination states of Mn2+ inside and near the surface of ZnS:Mn nanocrystal (NC) (ca. 1.8 nm in particle radius) coated with poly(acrylic acid) (PAA) were examined by the detailed analysis of electron paramagnetic resonance (EPR). The symmetry of both Mn2+ sites inside and near the surface of NC is lower than that of submicron particles (0.125 μm in particle radius), because of larger lattice distortion and larger zero field splitting constant. Temperature dependence of line width (ΔHpp) of EPR signals from Mn2+ inside and near surface sites of ZnS:Mn disappears when the particle radius of ZnS:Mn decreases from 0.125 μm to 1.8nm. These indicate increasing extent of d-d transition and stronger interaction between Mn2+ and ZnS as well as between Mn2+ and PAA in NC, leading to more effective energy transfer from ZnS and PAA to Mn2+. These phenomena explain the high luminescence intensity of ZnS:Mn nanocrystal coated with PAA.

AB - Coordination states of Mn2+ inside and near the surface of ZnS:Mn nanocrystal (NC) (ca. 1.8 nm in particle radius) coated with poly(acrylic acid) (PAA) were examined by the detailed analysis of electron paramagnetic resonance (EPR). The symmetry of both Mn2+ sites inside and near the surface of NC is lower than that of submicron particles (0.125 μm in particle radius), because of larger lattice distortion and larger zero field splitting constant. Temperature dependence of line width (ΔHpp) of EPR signals from Mn2+ inside and near surface sites of ZnS:Mn disappears when the particle radius of ZnS:Mn decreases from 0.125 μm to 1.8nm. These indicate increasing extent of d-d transition and stronger interaction between Mn2+ and ZnS as well as between Mn2+ and PAA in NC, leading to more effective energy transfer from ZnS and PAA to Mn2+. These phenomena explain the high luminescence intensity of ZnS:Mn nanocrystal coated with PAA.

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