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dc.contributor.authorAycibin, Murat
dc.date.accessioned2014-03-04T18:21:09Z
dc.date.available2014-03-04T18:21:09Z
dc.date.issued2009-12
dc.identifier.otheraycibin_murat_200912_phd
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/aycibin_murat_200912_phd
dc.identifier.urihttp://hdl.handle.net/10724/25995
dc.description.abstractIn this dissertation, we investigated Eu2+ ion in CsCaF3 and Rb2MP2O7 with M=Ca,Sr. The emission spectra of Eu2+ ion doped in CsCaF3 shows a very unique behavior. Depending on temperature, the peak of the emission shifts from 628 nm at 6 K to 520 nm at 300 K. This shift has been attributed to the presence of the two Eu2+ sites or alternatively to anomalous emission i.e, emission from an impurity bound exciton. From relevant optical data, the centroid shift, red shift, Stokes shift and the lowest excited-energy location are estimated. The luminescence parameters of Eu2+ in CsCaF3 are discussed and arguments are presented to associate the luminescence with the anomalous emission transition. We also report on the excitation and emission spectra of the octahedrally coordinated Eu2+ ions in Rb2MP2O7 with M=Ca, Sr. Again, the centroid shift, red shift and Stokes shift and the energy of the lowest-excited state are estimated from optical data. The Eu2+ emission in these materials is characterized by a large Stokes shift, which, for phosphates, results in the lowest reported emission bands peak at 645 nm and 590 nm for Rb2CaP2O7 and Rb2SrP2O7, respectively. At this point, Eu2+ emission in these materials can be ascribed to a normal, although extreme case, of the intra-ion 4f65d1 ! 4f7[8S7=2] transition.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectLuminesencence
dc.subjectEmission
dc.subjectStokes Shift
dc.subjectOctahedral Symmetry
dc.subjectCentroid Shift
dc.subjectAnomalous Emission
dc.subjectDivalent Europium
dc.subjectJahn-Teller E ect
dc.subjectExcitation
dc.subjectRed shift
dc.subjectCsCaF3
dc.subjectRb2MP2O7
dc.subjectDissertations (academic)
dc.titleLuminescence properties of octahedrally coordinate Eu2+ ions
dc.typeDissertation
dc.description.degreePhD
dc.description.departmentPhysics and Astronomy
dc.description.majorPhysics
dc.description.advisorUwe Happek
dc.description.committeeUwe Happek
dc.description.committeeKin-Keung Mon
dc.description.committeeWilliam Dennis


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