Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 김성진 | * |
dc.date.accessioned | 2016-08-28T11:08:29Z | - |
dc.date.available | 2016-08-28T11:08:29Z | - |
dc.date.issued | 1997 | * |
dc.identifier.issn | 0022-4596 | * |
dc.identifier.other | OAK-12442 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/228589 | - |
dc.description.abstract | The 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.language | English | * |
dc.title | Structural and Luminescence Properties of Ca1-xLaxS (x=0-0.3) | * |
dc.type | Article | * |
dc.relation.issue | 1 | * |
dc.relation.volume | 131 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 101 | * |
dc.relation.lastpage | 107 | * |
dc.relation.journaltitle | Journal of Solid State Chemistry | * |
dc.identifier.doi | 10.1006/jssc.1997.7354 | * |
dc.identifier.scopusid | 2-s2.0-0000296348 | * |
dc.author.google | Choi H. | * |
dc.author.google | Kim C.-H. | * |
dc.author.google | Pyun C.-H. | * |
dc.author.google | Kim S.-J. | * |
dc.contributor.scopusid | 김성진(56812714700) | * |
dc.date.modifydate | 20240301081003 | * |