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dc.contributor.advisorChandrasekhar, Holalkere R.eng
dc.contributor.authorMartin, Christopher M., 1973-eng
dc.date.issued2005eng
dc.date.submitted2005 Springeng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file viewed on (February 28, 2007)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionVita.eng
dc.descriptionThesis (Ph.D.) University of Missouri-Columbia 2006.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Physics.eng
dc.description.abstractI present a study of the optical properties of poly-para-phenylene and three different side-chain substituted polyfluorene polymers. I present an analysis of the Raman spectra under hydrostatic pressures for three oligo(para-phenylene) materials (p-terphenyl, 3P; p-quaterphenyl, 4P; and p-hexaphenyl, 6P) under hydrostatic pressure up to 80 kbar, with a focus on the 15-25 kbar region where the molecules are known to be forced into a more planar state. I present studies of the photoluminescence (PL) and Raman modes of polyfluorene (PF2/6) under hydrostatic pressures of 0-120 kbar at room temperature. The distinct PL with associated vibronics observed at atmospheric pressure blue shifts and changes dramatically around 20 kbar, above this pressure a broad peak at about 2.3 eV, associated with the keto defect, begins to dominate the PL. Raman modes observed are the 1417 cm-1 mode from the C-C stretch within the monomer, the 1342 cm-1 and 1290 cm-1 modes from phenyl rings connecting the monomer units, and the 1600 cm-1 modes from the intra-ring C-C stretch. All Raman modes analyzed shift to higher energies with pressure. Some of the phonon lines exhibit an antiresonance effect at higher pressures that is indicative of a high electron phonon interaction between the Raman phonons and the (real) PL transitions.eng
dc.identifier.merlinb57903013eng
dc.identifier.oclc85443567eng
dc.identifier.urihttps://hdl.handle.net/10355/4425
dc.identifier.urihttps://doi.org/10.32469/10355/4425eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subjectpoly-para-phenylene ;p-terphenyl 3P;p-quaterphenyl, 4P;p-hexaphenyl, 6P.eng
dc.subjectpoly-para-phenylene ;p-terphenyl 3P;p-quaterphenyl, 4P;p-hexaphenyl, 6Peng
dc.subject.lcshFluoreneeng
dc.subject.lcshHydrostatic pressureeng
dc.subject.lcshLuminescenceeng
dc.subject.lcshAfterglow (Physics)eng
dc.subject.lcshRaman effecteng
dc.titlePressure dependence of the luminescence and Raman modes in polyfluoreneeng
dc.typeThesiseng
thesis.degree.disciplinePhysics (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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