Photophysical characterizations of 2-(4-Biphenylyl)-5 phenyl-1,3,4- oxadiazole in restricted geometry

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dc.creatorPaul, P. K.
dc.creatorHussain, S. A.
dc.creatorBhattacharjee, D.
dc.date2008-11-27
dc.date.accessioned2026-07-07T12:06:15Z
dc.date.available2026-07-07T12:06:15Z
dc.descriptionLangmuir and Langmuir-Blodgett (LB) films of nonamphiphilic 2-(4-Biphenylyl)-5 phenyl-1,3,4- oxadiazole (abbreviated as PBD) mixed with stearic acid (SA) as well as also with the inert polymer matrix poly(methyl methacrylate) (PMMA) have been studied. Surface pressure versus area per molecule (-A) isotherms studies suggest that PBD molecules very likely stand vertically on the air-water interface and this arrangement allows the PBD molecules to form stacks and remain sandwiched between SA/PMMA molecules. At lower surface pressure phase separation between PBD and matrix molecules occur resulting due to repulsive interaction. However at higher surface pressure PBD molecules form aggregates. The UV-Vis absorption and Steady state fluorescence spectroscopic studies of the mixed LB films of PBD reveal the nature of the aggregates. H-type aggregates predominates in the mixed LB films whereas I-type aggregates predominates in the PBD-PMMA spin coated films. The degree of deformation produced in the electronic levels are largely affected by the film thickness and the surface pressure of lifting.
dc.description15 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0811.4591
dc.identifierhttp://arxiv.org/abs/0811.4591
dc.identifierdoi:10.1016/j.jlumin.2007.05.001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208599
dc.subjectMaterials Science
dc.titlePhotophysical characterizations of 2-(4-Biphenylyl)-5 phenyl-1,3,4- oxadiazole in restricted geometry
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