Effect of cadmium telluride quantum dots on the dielectric and electro-optical properties of ferroelectric liquid crystals

Abstract

We present here the dielectric and electro-optical studies of cadmium telluride quantum dots (CdTe QDs) doped ferroelectric liquid crystals (FLCs). It has been observed that the doping of CdTe QDs not only induced a pronounced memory effect but also affected the physical parameters of FLC material (LAHS19). The modifications in the physical parameters and memory effect of LAHS19 are found to depend on the concentration ratio of CdTe QDs. The lower concentration of CdTe QDs (1-3 wt%) enhanced the values of spontaneous polarization and rotational viscosity of LAHS19 material but did not favor the memory effect, whereas a higher concentration of CdTe QDs (>5 wt%) degraded the alignment of LAHS19 material. The doping of ∼5 wt% of CdTe QDs is found to be the most suitable for achieving good memory effect without significantly affecting the material parameters.

Properties of Nematic Liquid Crystals Doped with CdSe/ZnS Semiconductor Nanoparticales

“…Вместе с тем добавление наночастиц в ЖК может вызывать изменение характера ориентации в результате вариации начального угла наклона директора [6], уменьшение фазовой задержки [11], а также ускорение оптического отклика ЖК с увеличением их концентрации [5]. Добавление полупроводнико-вых КТ позволяет варьировать диэлектрические свойства жидких кристаллов в зависимости от размера и концентрации наночастиц [14,15].…”

Quantum dots as liquid crystal dopants

“…Kumar and coworkers presented results on FLC-QD composites by publishing several papers in the field. [135][136][137][138][139] They presented and discussed concentration-dependent effects on dielectric and electro-optical parameters of an FLC material after doping with CdTe QDs.…”

Low-voltage electro-optical memory device based on NiO nanorods dispersed in a ferroelectric liquid crystal

“…A variety of nano structured materials including metal nanoparticles (NPs), 19 metal oxide NPs, 20 ferroelectric NPs, 21 carbon nanotubes, 22 quantum dots 23 etc. have been used to improve the memory behavior of LCs.…”