We investigated fluorescence from hemicyanine dye molecules in a liquid crystal (4,4′-n-pentylcyanobiphenyl) (5CB) medium at different temperatures. The fluorescence decay lifetime decreased monotonically irrespective of the thermodynamic phases of the host medium as the temperature was increased. This behavior is due to an intramolecular motion of the dye promoted with the decrease in the viscosity of the medium facilitating a nonradiative decay of the excited dye molecules. By contrast, fluorescence intensity from the dyes in the nematic phase was about 3 times stronger than that in the crystalline or isotropic phase. This fluorescence enhancement in the nematic phase was found to be due to an anisotropic alignment of the dye molecules following the anisotropic alignment of the host liquid crystal medium along the pump-beam polarization direction. This light-induced liquid crystal molecular alignment was markedly enhanced by the guest dyes preferentially excited along the pump-beam polarization direction. The orientational order parameter of the dyes in the liquid-crystalline phase deduced from fluorescence anisotropy measurement was similar to the known order parameter of the liquid crystalline 5CB.
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15 September 2011
Research Article|
September 28 2011
Fluorescence enhancement of dye-doped liquid crystal by dye-induced alignment effect
Taekyu Shim;
Taekyu Shim
1
Department of Physics and Interdisciplinary Program of Integrated Biotechnology Sogang University
, Seoul 121-742, Korea
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Sunghyun Kim;
Sunghyun Kim
1
Department of Physics and Interdisciplinary Program of Integrated Biotechnology Sogang University
, Seoul 121-742, Korea
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Doseok Kim;
Doseok Kim
a)
1
Department of Physics and Interdisciplinary Program of Integrated Biotechnology Sogang University
, Seoul 121-742, Korea
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Masahito Oh-e
Masahito Oh-e
2Liquid Crystal Nano-system Project, ERATO/SORST, Japan Science & Technology Agency, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635,
Japan
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Appl. Phys. 110, 063532 (2011)
Article history
Received:
May 06 2011
Accepted:
August 17 2011
Citation
Taekyu Shim, Sunghyun Kim, Doseok Kim, Masahito Oh-e; Fluorescence enhancement of dye-doped liquid crystal by dye-induced alignment effect. J. Appl. Phys. 15 September 2011; 110 (6): 063532. https://doi.org/10.1063/1.3642960
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