Title
High Birefringence Phenyl Tolane Positive Compounds For Dual Frequency Liquid Crystals
Keywords
Dual frequency liquid crystals; High birefringence
Abstract
Dual frequency liquid crystals (DFLCs) provide a possibility to achieve sub-millisecond rise and decay times and are useful for various electro-optical devices. In most of DFLC mixtures, ester compounds are utilised in order to obtain a low crossover frequency. However, the ester linking group does not provide π electron conjugation so that the DFLC mixtures usually exhibit a limited birefringence (Δn < 0.3 at λ = 633 nm). For phase modulation a lower birefringence demands a thicker cell gap which, in turn, increases the response time and operating voltage. This problem becomes more severe as the wavelength increases. In this paper, we introduce a series of isothiocyanato phenyl tolane positive compounds with high birefringence and moderate dielectric relaxation frequency. The dielectric and electro-optical properties of these compounds are investigated. We also formulated a DFLC mixture using these new positive compounds which exhibits Δn = 0.39 at λ = 633 nm and 0.33 at λ = 1550 nm. © 2009 Taylor & Francis.
Publication Date
12-1-2009
Publication Title
Liquid Crystals
Volume
36
Issue
12
Number of Pages
1401-1408
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1080/02678290903242968
Copyright Status
Unknown
Socpus ID
72149133653 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/72149133653
STARS Citation
Sun, Jie; Xianyu, Haiqing; Gauza, Sebastian; and Wu, Shin Tson, "High Birefringence Phenyl Tolane Positive Compounds For Dual Frequency Liquid Crystals" (2009). Scopus Export 2000s. 11098.
https://stars.library.ucf.edu/scopus2000/11098