Dielectric and Performance Analysis of CdTe Quantum Dots Doped Nematic Liquid Crystal

Abstract

In this work, cadmium telluride core type quantum dots (CdTe QDs) weredispersed in 4-pentyl-4′-cyanobiphenyl (5CB) nematic liquid crystal (LC) with aconcentration of 0.05 % wt/wt; and their electrical and dielectric propertieswere investigated by using admittance measurements in the frequency range of100 Hz - 10 MHz. In order to determine the effects of CdTe QDs in 5CB nematicLC, dielectric anisotropy (∆ε), crossover frequency (fcrossover), critical frequency (fcritical), real and imaginary parts of permittivity (ε'and ε") of neat LC and CdTe QDs dispersed LC composites were obtainedusing the experimental data. Moreover, threshold voltage (Vth),splay elastic constant (K11) were also calculated. It was found thatVth and K11 of QDs dispersed LC are significantlydecreased due to the existence of CdTe QDs.

Keywords

• nematic liquid crystal
• quantum dot
• electrical and dielectric properties
• nematik sıvı kristal
• kuantum nokta
• elektrik ve dielektrik özellikler