scholarly journals Synergistic Path for Dual Anisotropic and Electrically Switchable Emission From a Nanocomposite of CsPbBr3 Quantum Cuboids and Nematic Liquid Crystal

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 378 ◽  
Author(s):  
Pragnya Satapathy ◽  
Pralay K. Santra ◽  
S. Krishna Prasad
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Liquid Crystal ◽  
Optical Microscopy ◽  
Nematic Liquid Crystal ◽  
Wide Temperature Range ◽  
Photophysical Properties ◽  
Emission Characteristic ◽  
Absorption And Emission ◽  
Linear Assembly

We report photophysical properties of a nanocomposite consisting of perovskite quantum cuboids (QCs) formed by CsPbBr3 and a wide temperature range nematic liquid crystal. Contrary to observations made with conventional II-VI quantum dots dispersed in a liquid crystal, the used QCs form, under the influence of the nematic orientation, linear assemblies over macroscopic length scales evidenced by polarizing optical microscopy. Interestingly, the linear assembly is actually caused by such an anisotropic arrangement at the nm scale, as seen in TEM images. Thin films of the nanocomposite exhibiting this unique and fascinating character exhibit absorption and emission features, which are quite appealing. These include retention of the sharp bandwidth of emission characteristic of the native QCs and establishment of dual anisotropies, arising from the values being different along the director as well in the two directions orthogonal to it. We also present data on voltage-driven switching between one of the anisotropic limits.

scholarly journals Quantum-dots-dispersed bent-core nematic liquid crystal and cybotactic clusters: Experimental and theoretical insights

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Sourav Patranabish ◽  
Yiwei Wang ◽  
Aloka Sinha ◽  
Apala Majumdar
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal

scholarly journals Effect of Doping ofCd1−xZnxS/ZnS Core/Shell Quantum Dots in Negative Dielectric Anisotropy Nematic Liquid Crystal p-Methoxybenzylidene p-Decylaniline

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 605
Author(s):  
Ayushi Rastogi ◽  
Fanindra Pandey ◽  
Rajiv Manohar ◽  
Shri Singh
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Dielectric Permittivity ◽  
Nematic Liquid Crystal ◽  
Phase Shifters ◽  
Ion Trapping ◽  
Dielectric Anisotropy ◽  
Core Shell ◽  
Optical Parameters ◽  
Dielectric Parameters

We report the effect of the doping of Cd1−xZnxS/ZnS core/shell quantum dots (CSQDs) in nematic liquid crystal p-methoxybenzylidenep-decylaniline (MBDA) at 0.05 wt/wt%, 0.1 wt/wt%, 0.15 wt/wt%, 0.2 wt/wt%, 0.25 wt/wt%, and 0.3 wt/wt% concentrations of CSQDs in MBDA. Dielectric parameters with and without bias with respect to frequency have been investigated. The change in electro-optical parameters with temperature has also been demonstrated. The increase in the mean dielectric permittivity was found due to the large dipole moment of CSQDs, which impose stronger interactions with the liquid crystal molecules. The dielectric anisotropy changes sign on doping CSQDs in MBDA liquid crystal. It was concluded that the CSQD doping noticeably increased the dielectric permittivity of nematic MBDA in the presence of an electric field. The doping of CSQDs in nematic MBDA liquid crystal reduced the ion screening effect effectively. This phenomenon is attributed to the competition between the generated ionic impurities during the assembling process and the ion trapping effect of the CSQDs. The rotational viscosity of nematic liquid crystal decreased with increasing concentration of the CSQDs, with a faster response time observed for the 0.05 wt/wt% concentration. The birefringence of the doped system increased with the inclusion of CSQDs in MBDA. These results find application in the field of display devices, phase shifters, LC – gratings, TIR waveguide, industries, and projectors.

scholarly journals Nanocomposites of a nematic liquid crystal doped with magic-sized CdSe quantum dots

2011 ◽  
Vol 21 (34) ◽  
pp. 12710 ◽  
Author(s):  
Javad Mirzaei ◽  
Martin Urbanski ◽  
Kui Yu ◽  
Heinz-S. Kitzerow ◽  
Torsten Hegmann
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Cdse Quantum Dots

scholarly journals Photophysical and Photochemical Properties of Green Fluorescent Liquid Crystalline Systems

2003 ◽  
Vol 58 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Ivo Grabchev ◽  
Jean-Marc Chovelon
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystalline ◽  
Photophysical Properties ◽  
Orientational Order ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Photochemical Properties ◽  
Green Fluorescent ◽  
Naphthalimide Dye

The photophysical properties of polymer-dispersed liquid crystal systems, containing naphthalimide dye as fluorescent units are reported. Investigations have been carried out on some 1,8- naphtalimide derivatives both in isotropic and anisotropic media, and their photophysal properties have been described. The orientational order parameters of the dyes in nematic liquid crystal ZLI 1840 have been determined. The photostability of the dye/liquid crystal systems has been investigated and the effect that the substituents in the naphthalimide structure have upon the orientation of the dye was discussed.

Thermodynamically Stable Dispersions of Quantum Dots in a Nematic Liquid Crystal

Langmuir ◽  
2013 ◽  
Vol 29 (30) ◽  
pp. 9301-9309 ◽  
Author(s):  
Maksym F. Prodanov ◽  
Nataliya V. Pogorelova ◽  
Alexander P. Kryshtal ◽  
Andrey S. Klymchenko ◽  
Yves Mely ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal
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