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Substitutional and surface Mn.sup.2+./sup. centers in cubic ZnS:Mn nanocrystals. A correlated EPR and photoluminescence study
- 1.0363935 - FZÚ 2012 RIV US eng J - Journal Article
Stefan, M. - Nistor, S.V. - Ghica, D. - Mateescu, C.D. - Nikl, Martin - Kučerková, Romana
Substitutional and surface Mn2+ centers in cubic ZnS:Mn nanocrystals. A correlated EPR and photoluminescence study.
Physical Review. B. Roč. 83, č. 4 (2011), 045301/1-045301/11. ISSN 1098-0121
R&D Projects: GA AV ČR KAN300100802
Institutional research plan: CEZ:AV0Z10100521
Keywords : ZnS:Mn * EPR * luminescence * decay kinetics
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.691, year: 2011
The EPR, radioluminescence, and photoluminescence of cubic ZnS (cZnS) nanocrystals (NCs) with a narrow size distribution centered at 2 nm, doped with 0.1, 0.2, and 0.5 at.% Mn2+ ions were investigated. Besides the main lines from substitutional Mn2+ ions localized in the core of the NCs next to a stacking defect, the EPR spectra exhibited two broader hyperfine sextets, attributed to the so-called Mn(II) and Mn(III) surface centers, which could be separated by adequate thermal treatments. The contribution to the photoluminescence from the Mn2+ ions at various sites was further determined from the analysis of the steady-state and time-resolved photoluminescence data from cZnS:Mn NCs subjected to thermal treatments and from cZnS:Mn single crystals.
Permanent Link: http://hdl.handle.net/11104/0199544
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