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Two Novel π -Conjugated Fluorophores for Dye-Doped LC On-Off Photoluminescence Switching

[ Vol. 17 , Issue. 5 ]

Author(s):

Rosita Diana, Barbara Panunzi* and Ugo Caruso*   Pages 340 - 344 ( 5 )

Abstract:


Among various classes of Photoluminescent (PL) compounds, soft-matter based materials in which chromophores are embedded in a Liquid-Crystal (LC) host polymer prove to be very attractive in the production of flexible panels and on-off temperature switches. Actually, the obtainment of low cost, easily synthesizable, and stable organic molecules soluble in the LC matrix is a challenge for both scholars and technologists. Here we describe the synthesis of two new emissive dyes based on a dicyanophenylenevinylene and on a bis-azobenzene core whose PL properties were investigated as neat solids, in solution, and in particular in a dye-doped LC nematic polymer often employed in PDLC applications. 1H NMR and 13C NMR spectroscopy allow the characterization of all compounds Their thermotropic liquid- crystalline (LC) properties were examined by differential scanning calorimetry and polarizing optical microscopy. Photoluminescence properties were characterized by fluorescence spectra.

Keywords:

Photoluminescent compounds, liquid-crystals, photoluminescence quantum yields, chromophores, polymer, fluorescence spectra.

Affiliation:

Department of Agriculture, University of Napoli Federico II, 80055 Portici NA, Department of Agriculture, University of Napoli Federico II, 80055 Portici NA, Department of Chemical Sciences, University of Napoli Federico II, 80126 Napoli

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