Počet záznamů: 1

Substitutional and surface Mn.sup.2+./sup. centers in cubic ZnS:Mn nanocrystals. A correlated EPR and photoluminescence study

  1. 1.
    0363935 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    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
    Grant CEP: GA AV ČR KAN300100802
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: ZnS:Mn * EPR * luminescence * decay kinetics
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.691, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0199544