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Title: Liquid crystalline polyacetylenes : a new class of mesomorphic materials with novel optical and electronic properties
Authors: Tang, Ben-Zhong
Lam, Wing Yip
Kong, Xiangxing
Lee, Priscilla Pui Sze
Wan, Xinhua
Kwok, Hoi-Sing
Huang, Yuan Ming
Ge, Wei-Kun
Chen, Hongzheng
Xu, Ruisong
Wang, Mang
Keywords: Side-chain liquid crystalline polymers
Molecular alignment
Electrical field
Optical and electronic materials
Issue Date: 1999
Citation: Liquid Crystals III, Iam-Choon Khoo, Editor, Proceedings of SPIE Vol. 3800, p. 62-71 (1999)
Abstract: A large number (more than 20 different kinds) of new polyacetylenes with general molecular structures of -[HC=C(C6H4-mesogen)]p- [poly(arylacetylene) type] and -{HC=C[(CH2)n-mesogen]}p- [poly(alkylacetylene) type] are designed and synthesized. Pendant interaction and backbone rigidity in the polyers 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 LCPAs.
Rights: Copyright 1999 Society of Photo-Optical Instrumentation Engineers. This paper was published in Liquid Crystals III, Iam-Choon Khoo, Editor, Proceedings of SPIE Vol. 3800, p. 62-71 (1999) and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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