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Proceedings Paper

Polyacetylene liquid crystals: new mesomorphic materials with high thermal stability and novel light-emitting properties
Author(s): Ben Zhong Tang; Jacky W. Y. Lam; Lo Ming Lai; Zhiliang Xie; Hoi Sing Kwok
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Paper Abstract

A series of new disubstituted liquid crystalline polyacetylenes (LCPAs) with general molecular structures of -{(R)C=C[(CH2)m-Mes]}n- and -[(C6H13)C=C(C6H4-Mes)]n- (R = CH3, C6H5, m = 3, 4, 9, Mes = mesogen) have been designed and synthesized. All the LCPAs are thermally stable and do not loss their weights when heated to a temperature as high as ~400°C. While a few polymers exhibit nematicity, most of them form enantiotropic SA phase of monolayer structure. Upon photoexcitation, the polymers emit intense UV and blue lights with quantum yield up to 81%. Multilayer light-emitting diodes with a device configuration of ITO/PVK/PA/LiF/Al are constructed, which emits blue light with maximum luminance and external quantum efficiency of 119 cd/m2 and 0.12%, respectively.

Paper Details

Date Published: 5 January 2004
PDF: 11 pages
Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004); doi: 10.1117/12.504998
Show Author Affiliations
Ben Zhong Tang, Hong Kong Univ. of Science and Technology (China)
Jacky W. Y. Lam, Hong Kong Univ. of Science and Technology (China)
Lo Ming Lai, Hong Kong Univ. of Science and Technology (China)
Zhiliang Xie, Hong Kong Univ. of Science and Technology (China)
Hoi Sing Kwok, Hong Kong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 5213:
Liquid Crystals VII
Iam-Choon Khoo, Editor(s)

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