Effect of dispersion of CdSe quantum dots on phase transition, electrical and electro-optical properties of 4PP4OB

ABSTRACT

We prepared composites of a liquid crystalline material, 4-pentylphenyl 4-octyloxybenzoate (4PP4OB) and cadmium selenide quantum dots (CdSe-QDs) and investigated their thermodynamic, electro-optical and dielectric properties. The effect of QDs on transition temperature from isotropic to nematic and nematic to smectic A phases was evaluated in this study. The effect of CdSe-QDs inclusion on various display parameters on host liquid crystals was studied in the nematic phase. The electrical parameters of the composites – relative permittivity, dielectric anisotropy, dielectric loss and dielectric relaxation – were investigated in the nematic and smectic phases. The changes in dielectric parameters of the composites are explained in terms of Maier–Meier theory.

GRAPHICAL ABSTRACT

KEYWORDS:

• Liquid crystals quantum dots composites
• dielectric parameters
• display parameters
• transmission-voltage characteristics

Acknowledgments

This work is financially supported by SERC-DST and DAE (BRNS), Govt of India vide project no. FTP/PS-60/2008 and 2010/20/37P/4/BRNS/1591, respectively.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The work was supported by the state targets higher education institutions in 2014 and the planning period of 2015 and 2016 in terms of R&D [project codes: 3.720.2014/K].