Specific features of luminescence quenching in a nematic liquid crystal doped with nanoparticles


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Abstract

The change in the intensity of the photoluminescence (PL) spectra of nematic liquid crystal (NLC) composites as a function of the concentration of CdSe/ZnS semiconductor quantum dots (QDs) and TiO2 and ZrO2 nanoparticles ~5 nm in diameter has been investigated. It is shown that the PL-quenching intensity in composites with CdSe/ZnS QDs exceeds that in composites with TiO2 and ZrO2 nanoparticles. The lowfrequency spectra of these composites with a concentration of 0.1 wt %, recorded in the range of 102–103 Hz, and the content of mobile ions in them have been investigated. It is found that the dielectric loss in the composite with CdSe/ZnS QDs is much higher and the content of mobile ions is larger by a factor of 3 than in the composites with TiO2 and ZrO2 nanoparticles. It is shown that an increase in the CdSe/ZnS QD concentration in NLC composites leads to an increase in the dielectric loss and a decrease in the PL intensity. Possible mechanisms of the interaction between NLC molecules and CdSe/ZnS QDs are discussed.

About the authors

M. A. Kurochkina

ITMO University

Email: eakonshina@mail.ru
Russian Federation, St. Petersburg, 197101

E. A. Konshina

ITMO University

Author for correspondence.
Email: eakonshina@mail.ru
Russian Federation, St. Petersburg, 197101

D. P. Shcherbinin

ITMO University

Email: eakonshina@mail.ru
Russian Federation, St. Petersburg, 197101

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