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Proceedings Paper • Open Access

Light-emitting liquid-crystal displays constructed from AIE luminogens

Paper Abstract

Liquid crystal displays (LCDs) are widely used for diverse purposes in many aspects in daily life from handle personal devices to professional applications and large-panel LCD televisions. Since LCD is a passive emission display device, it usually shows narrow viewing angle and reduced brightness. Nowadays, LCDs with light-emitting properties is suggested as a less energy consuming displays. To date, fluorescent materials with dichroic properties and strong fluorescence emission are required. However, many molecular emitters, which are highly efficient in solution, will suffer from heavy aggregation-caused quenching (ACQ) effect in the aggregate state, which has greatly limited their applications. In order to overcome these weaknesses, we have designed and synthesized a novel luminescent liquid crystalline compound consisting of a tetraphenylethene (TPE) core, TPE-PPE, as a luminogen with mesogenic moieties. As a result, the TPE-PPE exhibits both the aggregate-induced emission (AIE) and thermotropic liquid crystalline characteristics. By dissolving 1 weight% (wt%) of TPE-PPE into the nematic LC host PA0182, a linearly polarized emission was obtained on the unidirectional orientated LC cell. The photoluminescence polarization ratio of the LC cell has reached to 4.16 between the directions perpendicular and parallel to the rubbing direction. Utilizing the emissive anisotropic TPE-PPE, we have fabricated the photoluminescent liquid crystal display (PL-LCD). This approach has simplified the device design, lowered the energy consumption and increased brightness of the LCD.

Paper Details

Date Published: 7 October 2014
PDF: 6 pages
Proc. SPIE 9182, Liquid Crystals XVIII, 918207 (7 October 2014); doi: 10.1117/12.2060507
Show Author Affiliations
Dongyu Zhao, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Beijing Univ. of Aeronautics and Astronautics (China)
Anjun Qin, South China Univ. of Technology (China)
Ben Zhong Tang, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Beijing Univ. of Aeronautics and Astronautics (China)
South China Univ. of Technology (China)
Chris Wai Tung Leung, Hong Kong Univ. of Science and Technology (Hong Kong, China)

Published in SPIE Proceedings Vol. 9182:
Liquid Crystals XVIII
Iam Choon Khoo, Editor(s)

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