Molecular crystals and liquid crystals · 1973 · 40 citations · 5 references
Natural SciencesChemistryPhysicsOptical MaterialsPhysical ChemistrySpectroscopyCrystal ChemistryFluorescence SpectroscopyLiquid Crystal MaterialsLiquid CrystalsOptical Properties Of SolidsPhase TransitionsAbsorption CoefficientsFluorescence Quantum YieldFluorescent DyesLight Absorption CoefficientsLiquid Crystal Phase BehaviorNematic Liquid CrystalsOrder ParametersOrganic Dye Photophysics
Abstract Pleochroic absorption and polarized fluorescence of guest molecules oriented in nematic liquid crystals were observed in the nematic phase and at the nematic-isotropic phase transition. The order parameters calculated from fluorescence intensities were found to be smaller than those calculated from the absorption coefficients. For some guest-host combinations a change in the quantum yield of the fluorescence was observed at the nematic-isotropic transition point.
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