title: EPR study of ZnS: Mn2+ nanocrystals in Pyrex glasses.
abstract: ZnS: Mn2+ nanocrystals embedded in Pyrex glasses were spectrally studied using EPR and photoluminescence techniques. Photoluminescence (PL) and excitation (PLE) spectra revealed that manganese impurities can be classified as two types of luminescent centers, i.e., occupying substitutional sites (Mn2+)sub or interstitial sites (Mn2+)int. Three types of manganese sites of (Mn2+)sub, (Mn2+)int, and Mn clusters were identified by the EPR spectra. An increase of the g1 factor and hyperfine structure (HFS) constant with decreasing sizes of nanocrystals was observed. The increase was attributed to a hybridization of the s-p state of ZnS and the d state of manganese ions enhanced by quantum confinement effects or surface states.
authors.affiliation: Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P R China.
authors.forename: C X
authors.initials: CX
authors.lastname: Liu
authors.forename: J Y
authors.initials: JY
authors.lastname: Liu
authors.forename: K
authors.initials: K
authors.lastname: Dou
mesh_terms: D003460:Crystallization / Q000379:methods*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005898:Glass / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D007477:Ions; D008027:Light; D049449:Luminescence; D008345:Manganese / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D010316:Particle Size; D010777:Photochemistry / Q000379:methods; D012666:Semiconductors; D013440:Sulfides / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D017967:Zinc Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D007477:Ions; D013440:Sulfides; D017967:Zinc Compounds; D008345:Manganese; C031238:zinc sulfide