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dc.contributor.author김성진*
dc.date.accessioned2016-08-28T11:08:29Z-
dc.date.available2016-08-28T11:08:29Z-
dc.date.issued1997*
dc.identifier.issn0022-4596*
dc.identifier.otherOAK-12442*
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/228589-
dc.description.abstractThe structure and photoluminescence of Ca1-xLaxS (x=0-0.3) were investigated. The samples were prepared by sulfurizing the mixture of CaCO3and La2O3in the flux of Na2CO3-S or K2CO3-S, and by gas reaction with CS2. By using different methods of preparation, defect structure and concentration could be controlled chemically. Ca1-xLaxS prepared in the Na2CO3-S flux has a wider solid solution range than that prepared in the K2CO3-S flux, and such a feature seems to be due to similar ionic size of Na+and Ca2+. As the substitution of La3+increases, the band gap of the host material decreases due to the increase of the lattice parameters, and the photoluminescence spectra of the Ca1-xLaxS shift to longer wavelengths. Since La3+ion itself is transparent to ultraviolet radiation, vacancies (VCa2+, VS2+) and substituted ions (Na+ Ca2+, La3+ Ca2+) seem to be associated with luminescence centers. The acceptor levels of Na+ Ca2+and VCa2+are estimated to be about 1.1 and 0.5 eV above the valence band, respectively, and the donor levels of La3+ Ca2+and VS2-to be about 1.8 eV below the conduction band. The emission bands observed at 500-580 nm suggest the recombination processes of donors with acceptors. © 1997 Academic Press.*
dc.languageEnglish*
dc.titleStructural and Luminescence Properties of Ca1-xLaxS (x=0-0.3)*
dc.typeArticle*
dc.relation.issue1*
dc.relation.volume131*
dc.relation.indexSCI*
dc.relation.indexSCIE*
dc.relation.indexSCOPUS*
dc.relation.startpage101*
dc.relation.lastpage107*
dc.relation.journaltitleJournal of Solid State Chemistry*
dc.identifier.doi10.1006/jssc.1997.7354*
dc.identifier.scopusid2-s2.0-0000296348*
dc.author.googleChoi H.*
dc.author.googleKim C.-H.*
dc.author.googlePyun C.-H.*
dc.author.googleKim S.-J.*
dc.contributor.scopusid김성진(56812714700)*
dc.date.modifydate20240301081003*
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자연과학대학 > 화학·나노과학전공 > Journal papers
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