CdS Nanorods Imbedded in Liquid Crystal Cells for Smart Optoelectronic Devices

Abstract

A novel nanocomposite device, which consists of liquid crystals and semiconductor nanorods, has been designed and fabricated. It reveals a very unique and useful behavior in that the polarization of the emission from semiconductor nanorods can be controlled by an external bias. The large magnitude of polarization anisotropy of 0.63 can be quantitatively interpreted very well in terms of the dielectric contrast between semiconductor and liquid crystal. Our approach is quite general, which is applicable to other nanomaterials, and it utilizes the currently mature liquid crystal display technology. The results open up new possible applications for one-dimensional semiconductor nanostructures in smart optoelectronic applications, including optical switches, integrated photonic devices, as well as electrochromatic gadgets in the near future.

Influence of substrates on the structural and optical properties of ammonia-free chemically deposited CdS films

“…As one of the metal chalcogenide semiconductors (II-VI), CdS has been intensively investigated because of its great application in solar cells [1], optical detectors [2] and optoelectronic devices [3]. Various techniques have been used to make CdS films, such as vacuum evaporation [4], sputtering [5], electrodeposition [6], spray pyrolysis [7], chemical bath deposition (CBD) [8], and ion layer gas reaction (ILGAR) [9].…”

Nanorod‐Driven Orientational Control of Liquid Crystal for Polarization‐Tailored Electro‐Optic Devices

“…[10][11][12][13][14] However, incorporation of nanomaterials into an LC matrix gives rise to topological defects, due to deformations of the director field about the surface of the colloid species, breaking the continuous symmetry of the blend. [6,10,[12][13][14] For incorporation of nanomaterials in an LC matrix, the proper selection of size, shape, and crystallographic phase of the nanomaterials is critical for enhancing the performance of the blend. For example, spherical particles or centrosymmetric materials are less responsive to external fields, and tend to not form long-range ordered structures.…”

Investigation of Structural and Spectroscopic Properties of Nanostructured CdS Films

“…Cadmium sulphide belongs to II-VI group material and it is a special material having direct wide band gap energy (2.42 eV in bulk form) and high refractive index (2.5). It has wide range of applications in numerous areas including multilayer light emitting diode [1], field effect transistor, gas sensor [2], photovoltaic cell [3], optoelectronic devices [4] and many more. Different workers have adopted various techniques to prepare CdS nonmaterials such as sputtering [5], spray pyrolysis [6], electrochemical deposition [7], pulsed laser deposition [8], vacuum deposition [9], chemical deposition, etc.…”