Polarized Fluorescence Studies of Orientational Order in Some Nematic Liquid Crystals Doped with Stilbene Dye
- 1 March 1991
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 197 (1) , 1-13
- https://doi.org/10.1080/00268949108029698
Abstract
The measurements of the polarized fluorescence intensity for a stilbene guest molecule dissolved in nematic liquid crystals (5CB, 7CB and PCH7) have been used to study the molecular orientational order in thin aligned samples. The temperature dependence of the order parameters ⟨P2⟩ and ⟨P4⟩ have been investigated. The attempt for the explanation of the different behaviour of ⟨P4⟩ parameter in the various liquid crystals has been undertaken. On the basis of the experimental ⟨P2⟩ and ⟨P4⟩ values some information about the orientational distribution of molecules in guest-host mixture have been obtained.Keywords
This publication has 36 references indexed in Scilit:
- Comparative Studies of the Degree of Order of the Guest and Host Molecules in 4-Cyano-4′-n−Heptyl-p−Phenylcyclohexane (PCH7) MixturesMolecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1989
- Orientational Characteristics ofnCB(n=5,6,7) Liquid Crystals by Means of Fluorescence Probe MethodMolecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1989
- The Study of the Guest Effect on the Nematic Phase StabilizationMolecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, 1988
- Structure of the Short Range Ordered Nematic Phases of nBABA (n= 1 to 9Molecular Crystals and Liquid Crystals, 1987
- The Study of the Guest Host Effect in Thin Aligned Liquid Crystal Film by Raman SpectroscopyMolecular Crystals and Liquid Crystals, 1987
- The order parameters < P2 > and < P 4 > in nematic p-alkyl-p' -cyano-biphenyls : polarized Raman measurements and the influence of molecular associationJournal de Physique, 1985
- Anisotropic steric effects and negative〈P4〉in nematic liquid crystalsPhysical Review A, 1983
- Dielectric and optical studies of a nematogen (4,4-n-heptyl-cyanobiphenyl)Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1976
- Raman Scattering from a Nematic Liquid Crystal: Orientational StatisticsPhysical Review Letters, 1973
- General description of orientation factors in terms of expansion of orientation distribution function in a series of spherical harmonicsJournal of Polymer Science Part A-2: Polymer Physics, 1970