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Effect of Perovskite Quantum Dots on the Dielectric Properties of a Nematic Liquid Crystal Material

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Title Effect of Perovskite Quantum Dots on the Dielectric Properties of a Nematic Liquid Crystal Material
 
Creator Ansari, Asif Ali
Prakash, Jai
Nidhi
Aafreen
Chauhan, Shikha
Singh, Gautam
 
Subject Nematic liquid crystal
Quantum dots
Dielectric permittivity
 
Description 109-115
Dispersion of quantum dots (QDs) in liquid crystal (LC) medium can effectively modify their dielectric and electro-optical
properties which can be useful in LC based display as well as non-display applications. Here, we reported the effect of
doping of perovskite quantum dots (PQDs) on the dielectric properties of a nematic liquid crystal (NLC) material namely
ZLI-1565 throughout its nematic and isotropic phases. The dielectric parameters of pure NLC and its composites with PQDs
(0.1 wt.%, 0.25 wt.% and 0.5 wt. %) were observed in the frequency range of 20 Hz - 2 MHz.The value of dielectric
permittivity (ɛʹ) and dielectric loss (ɛʺ) increases in composites as compared to pure NLC in the low frequency region due to
the increment in the mobile ion density. The spectral peak of loss factor (tan δ) of pure NLC shifts towards the high
frequency region with the addition of PQDs. Moreover, the temperature dependent dielectric parameters were also evaluated
for pure NLC and 0.25 wt.% PQDs-NLC composite (i.e. optimum concentration). Moreover, the dielectric anisotropy and
threshold voltage were also evaluated for pure sample and 0.25 wt.% composite. A point to be noted here that the clearing
temperature (TN-I) of 0.25 wt.% composite is reduced by 4 °C as compared to pure NLC. The results obtained on such
PQDs-NLC composites could be utilized in the fabrication of NLC based electrical devices with tunable dielectric features.
 
Date 2024-02-26T09:21:44Z
2024-02-26T09:21:44Z
2024-02
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/63413
https://doi.org/10.56042/ijpap.v62i2.7686
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.62(02) [February 2024]