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Fluorescence enhancement of dye-doped liquid crystal by dye-induced alignment effect
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10.1063/1.3642960
/content/aip/journal/jap/110/6/10.1063/1.3642960
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/6/10.1063/1.3642960
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structures of (a) hemicyanine, and (b) 5CB.

Image of FIG. 2.
FIG. 2.

(Color online) Steady-state fluorescence spectra of hemicyanine in 5CB for (a) the linearly-polarized pump beam excitation (solid lines represent the crystalline phase measured at 273,283, 288, and 293 K; dashed lines represent the nematic phase measured at 296, 299, and 302 K from top to bottom; dotted lines represent the isotropic phase measured at 306, 309, 312, and 315 K from top to bottom), and (b) the circularly-polarized pump beam excitation (solid lines represent the crystalline phase measured at 278, 283, 288, and 293 K from top to bottom; dashed lines represent the nematic phase measured at 296, 299, and 302 K from top to bottom; dotted lines represent the isotropic phase measured at 306, 309, 312, and 315 K from top to bottom). The insets show the experimental geometry for the corresponding data.

Image of FIG. 3.
FIG. 3.

Fluorescence peak shift and intensity change with the pump beam of (a) linear polarization, and (b) circular polarization. Vertical dashed lines denote the transition temperatures, and C, N, and I indicate the crystalline, nematic, and isotropic phases, respectively.

Image of FIG. 4.
FIG. 4.

Representative time-resolved fluorescence decay curves (at crystalline, nematic, and isotropic phases of 5CB) with pump beams of (a) linear polarization, and (b) circular polarization. The insets show the temperature dependence of fluorescence decay times for each case. Closed circles indicate the slow component, open circles indicate the fast component, and crosses indicate the average decay times deduced from fitting the data by two-component decay curves.

Image of FIG. 5.
FIG. 5.

Fluorescence anisotropy measurement with 5CB at different thermodynamic phases. Open circles indicate the crystalline phase (283 K), closed circles indicate the nematic liquid crystalline phase (297 K), and open squares indicate the isotropic phase (307 K).

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/content/aip/journal/jap/110/6/10.1063/1.3642960
2011-09-28
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fluorescence enhancement of dye-doped liquid crystal by dye-induced alignment effect
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/6/10.1063/1.3642960
10.1063/1.3642960
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