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Proceedings Paper

Liquid crystalline polyacetylenes: a new class of mesomorphic materials with novel optical and electronic properties
Author(s): Ben Zhong Tang; Wing Yip Lam; Xiangxing Kong; Priscilla P. S. Lee; Xinhua Wan; HoiSing Kwok; Yuanming Huang; Weikun Ge; Hongzheng Chen; Ruisong Xu; Mang Wang
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Paper Abstract

A large number (more than 20 different kinds) of new polyacetylenes with general molecular structures of -[HC equals C(C6H4-mesogen)]p- [poly(arylacetylene) type] and -{HC equals C[(CH2)n-mesogen]}p- [poly(alkylacetylene) type] are designed and synthesized. Pendant interaction and backbone rigidity in the polymers are tuned through systematic molecular engineering endeavor, and liquid crystalline polyacetylenes (LCPAs) with novel mesomorphic, optical, and electronic properties are successfully developed. The rigid polyacetylene backbones enable ready alignments of the LCPA molecules by simple mechanical perturbations. Upon photoexcitation, the LCPAs with the poly(alkylacetylene) skeleton structure emit strong blue light clearly observable by naked eyes under normal room illumination conditions. The shape and position of the emission peaks and the color of the emitted light can be manipulated by the application of external electrical fields. The LCPAs exhibit excellent intrinsic photoconductivity in the visible spectral region in the undoped (pure) states, and doping with electron acceptor/donor further increases the photoconduction efficiency of the LCPAs.

Paper Details

Date Published: 14 October 1999
PDF: 10 pages
Proc. SPIE 3800, Liquid Crystals III, (14 October 1999); doi: 10.1117/12.365790
Show Author Affiliations
Ben Zhong Tang, Hong Kong Univ. of Science and Technology (Hong Kong)
Wing Yip Lam, Hong Kong Univ. of Science and Technology (Hong Kong)
Xiangxing Kong, Hong Kong Univ. of Science and Technology (Hong Kong)
Priscilla P. S. Lee, Hong Kong Univ. of Science and Technology (Hong Kong)
Xinhua Wan, Hong Kong Univ. of Science and Technology (Hong Kong)
HoiSing Kwok, Hong Kong Univ. of Science and Technology (Hong Kong)
Yuanming Huang, Hong Kong Univ. of Science and Technology (Hong Kong)
Weikun Ge, Hong Kong Univ. of Science and Technology (Hong Kong)
Hongzheng Chen, Zhejiang Univ. (China)
Ruisong Xu, Zhejiang Univ. (China)
Mang Wang, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 3800:
Liquid Crystals III
Iam-Choon Khoo, Editor(s)

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