CIS-ZnS quantum dots for self-aligned liquid crystal molecules with superior electro-optic properties

Won Kyu Lee, Seung Jun Hwang, Min Jae Cho, Hong Gyu Park, Jin Woo Han, Seogjeong Song, Jong Hyun Jang, Dae-Shik Seo

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We demonstrate self-aligned and high-performance liquid crystal (LC) systems doped with 1-dimensional (1D) chain-like clusters of CuInS2 (CIS)-ZnS core-shell quantum dots (QDs). By changing the cell fabrication method of the LC-QD composites, we can selectively control the orientation of the LC molecules between the homogeneous and homeotropic states without conventional LC alignment layers. The homeotropic alignment of LCs was achieved by random dropcasting and the homogeneous alignment was performed using a capillary injection of LC-QDs due to the random or linear diffusion of QD clusters into ITO defects. The electrically compensated bend (ECB)- and vertically aligned (VA) mode LC displays (LCDs) containing our LC-QD composite both showed superior electro-optic (EO) properties. A 37.1% reduction in the threshold voltage (Vth) and a 36.6% decrease in the response time were observed for ECB mode LCDs, and a 47.0% reduction in the Vth and a 38.3% decrease in the response time were observed for VA mode LCDs, meaning that the proposed LC-QD composites have a great potential for the production of advanced flexible LCDs.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalNanoscale
Volume5
Issue number1
DOIs
Publication statusPublished - 2013 Jan 7

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Liquid Crystals
Electrooptical effects
Liquid crystals
Semiconductor quantum dots
Molecules
Display devices
Laser modes
Composite materials
Liquid crystal displays
Threshold voltage
Crystal orientation
Fabrication
Defects

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Lee, Won Kyu ; Hwang, Seung Jun ; Cho, Min Jae ; Park, Hong Gyu ; Han, Jin Woo ; Song, Seogjeong ; Jang, Jong Hyun ; Seo, Dae-Shik. / CIS-ZnS quantum dots for self-aligned liquid crystal molecules with superior electro-optic properties. In: Nanoscale. 2013 ; Vol. 5, No. 1. pp. 193-199.
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abstract = "We demonstrate self-aligned and high-performance liquid crystal (LC) systems doped with 1-dimensional (1D) chain-like clusters of CuInS2 (CIS)-ZnS core-shell quantum dots (QDs). By changing the cell fabrication method of the LC-QD composites, we can selectively control the orientation of the LC molecules between the homogeneous and homeotropic states without conventional LC alignment layers. The homeotropic alignment of LCs was achieved by random dropcasting and the homogeneous alignment was performed using a capillary injection of LC-QDs due to the random or linear diffusion of QD clusters into ITO defects. The electrically compensated bend (ECB)- and vertically aligned (VA) mode LC displays (LCDs) containing our LC-QD composite both showed superior electro-optic (EO) properties. A 37.1{\%} reduction in the threshold voltage (Vth) and a 36.6{\%} decrease in the response time were observed for ECB mode LCDs, and a 47.0{\%} reduction in the Vth and a 38.3{\%} decrease in the response time were observed for VA mode LCDs, meaning that the proposed LC-QD composites have a great potential for the production of advanced flexible LCDs.",
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Lee, WK, Hwang, SJ, Cho, MJ, Park, HG, Han, JW, Song, S, Jang, JH & Seo, D-S 2013, 'CIS-ZnS quantum dots for self-aligned liquid crystal molecules with superior electro-optic properties', Nanoscale, vol. 5, no. 1, pp. 193-199. https://doi.org/10.1039/c2nr32458j

CIS-ZnS quantum dots for self-aligned liquid crystal molecules with superior electro-optic properties. / Lee, Won Kyu; Hwang, Seung Jun; Cho, Min Jae; Park, Hong Gyu; Han, Jin Woo; Song, Seogjeong; Jang, Jong Hyun; Seo, Dae-Shik.

In: Nanoscale, Vol. 5, No. 1, 07.01.2013, p. 193-199.

Research output: Contribution to journalArticle

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AU - Hwang, Seung Jun

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AU - Han, Jin Woo

AU - Song, Seogjeong

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AU - Seo, Dae-Shik

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