Liquid crystalline polyacetylenes: a new class of mesomorphic materials with novel optical and electronic properties

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

doi:10.1117/12.365790

14 October 1999 Liquid crystalline polyacetylenes: a new class of mesomorphic materials with novel optical and electronic properties

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

Author Affiliations +

Proceedings Volume 3800, Liquid Crystals III; (1999) https://doi.org/10.1117/12.365790
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

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Ben Zhong Tang, Wing Yip Lam, Xiangxing Kong, Priscilla P. S. Lee, Xinhua Wan, HoiSing Kwok, Yuanming Huang, Weikun Ge, Hongzheng Chen, Ruisong Xu, and Mang Wang "Liquid crystalline polyacetylenes: a new class of mesomorphic materials with novel optical and electronic properties", Proc. SPIE 3800, Liquid Crystals III, (14 October 1999); https://doi.org/10.1117/12.365790

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