Polymer-doped ferroelectric liquid crystal: UV absorbance, fluorescence and electro-optical study

ABSTRACT

In this study, UV absorption, fluorescence and electro-optical study have been performed for pure ferroelectric liquid crystal (FLC) and its three different concentrations, i.e. 1%, 3% and 5% of fluorescent polymer in the pure FLC. We observed that there is higher value of UV absorption for fluorescent polymer-doped system in comparison to the pure system. We have found excitation wavelength, emission wavelength and quantum yield for all the mixtures. Quantum yield shows the probability of excited state being deactivated by fluorescence rather than non-radiative mechanism. The higher value of spontaneous polarization and faster response has been observed for fluorescent polymer-doped system compared to the pure FLC system. The electro-optical study also suggests that there exists an optimum concentration of fluorescent polymer for which we have found highest spontaneous polarization and least response time.

KEYWORDS:

• Fluorescence
• UV absorption
• spontaneous polarization

PACS numbers:

• 61.30.−v
• 42.70.Df

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Dr Abhishek Kumar Misra is thankful to DST, New Delhi India for the grant of Fast Track Project [SR/FTP/PS-091/2012] entitled ‘Ferroelectric Liquid Crystals versus Fluorescent Polymer Doped Ferroelectric Liquid Crystals’.