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Study on the Optical Characteristics of Various Quantum-Dot-Doped Nematic Liquid Crystals
New Phys.: Sae Mulli 2018; 68: 173~180
Published online February 28, 2018;
© 2018 New Physics: Sae Mulli.

Gun Yeup KIM, Chong Hoon KWAK*

Department of Physics, Yeungnam University, Gyeongsan 38541, Korea
Correspondence to:
Received December 15, 2017; Revised January 16, 2018; Accepted January 17, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We fabricated quantum-dot-doped nematic liquid cells (QD-NLC) with various QD emission wavelengths and measured the capacitance and the order parameter of the fabricated cells against the quantum-dot's emission wavelength by using a capacitor method and a polarization-dependence absorbance method, respectively. We developed a theory that explained the relations between the capacitance and the order parameter and estimated various optical constants, such as the isotropic capacitance, activation energy, rotational viscosity, and response time, of the QD-NLC cells; the results were in excellent agreement with the values published in the literature. Typical response times obtained in the experiment were 301 ms, 344 ms, 405 ms, 457 ms and 485 ms at QD emission wavelengths of 470 nm, 490 nm, 510 nm, 560 nm and 630 nm, respectively.
PACS numbers: 81.07.Ta, 61.30.-v, 84.37.+q, 78.15.+e, 66.20.-d
Keywords: Qunatum dot, 5CB nematic liquid crystal, Capacitance, Order parameter, Viscosity

June 2018, 68 (6)
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