Polyacetylene liquid crystals: new mesomorphic materials with high thermal stability and novel light-emitting properties

Ben Zhong Tang; Jacky W. Y. Lam; Lo Ming Lai; Zhiliang Xie; Hoi Sing Kwok

doi:10.1117/12.504998

5 January 2004 Polyacetylene liquid crystals: new mesomorphic materials with high thermal stability and novel light-emitting properties

Ben Zhong Tang, Jacky W. Y. Lam, Lo Ming Lai, Zhiliang Xie, Hoi Sing Kwok

Author Affiliations +

Proceedings Volume 5213, Liquid Crystals VII; (2004) https://doi.org/10.1117/12.504998
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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 S_A 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.

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Ben Zhong Tang, Jacky W. Y. Lam, Lo Ming Lai, Zhiliang Xie, and Hoi Sing Kwok "Polyacetylene liquid crystals: new mesomorphic materials with high thermal stability and novel light-emitting properties", Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004); https://doi.org/10.1117/12.504998

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