Characterization of Mn2+ Coordination States in ZnS Nanocrystal By EPR Spectroscopy and Related Photoluminescence Properties View Full Text


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Article Info

DATE

2001-02

AUTHORS

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

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 (Δ Hpp) 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 1.8 nm. 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. More... »

PAGES

51-56

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1011445009443

DOI

http://dx.doi.org/10.1023/a:1011445009443

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011066547


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