Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ferroelectric Nematic Liquid Crystals Showing High Birefringence
High birefringence nematic liquid crystals are particularly demanded for adaptive optics applications in the infrared spectrum because it enable a thinner cell gap for achieving fast response time and improved diffraction efficiency. The emerging ferroelectric nematic liquid crystals have attracted widespread interest in soft matter due to their unique combination of ferroelectricity and fluidity. However, the birefringence, which is one of the most important optical parameters in electro‐optic devices, is not large enough (<0.25) in most ferroelectric nematic materials. Here, a polar liquid crystal molecule library containing more than 60 molecules with a highly rigid and fluorinated nature is developed. The introduction of triple bonds constructs a long π‐electron conjugated mesogen skeleton, significantly improving the birefringence of polar liquid crystal phases. The birefringence and dispersion properties are systematically studied, demonstrating a strong dependence on chemical structures and the type of polar phases. Furthermore, through multi‐component mixing, polar liquid crystal mixtures with ultra‐wide temperature range and excellent stability at or near room temperature are obtained. They possess much higher birefringence than the existing ferroelectric liquid crystal materials. The unique combination of high birefringence and fluidic ferroelectricity is expected to promote the application of polar liquid crystals in electro‐optic technologies.
Ferroelectric Nematic Liquid Crystals Showing High Birefringence
High birefringence nematic liquid crystals are particularly demanded for adaptive optics applications in the infrared spectrum because it enable a thinner cell gap for achieving fast response time and improved diffraction efficiency. The emerging ferroelectric nematic liquid crystals have attracted widespread interest in soft matter due to their unique combination of ferroelectricity and fluidity. However, the birefringence, which is one of the most important optical parameters in electro‐optic devices, is not large enough (<0.25) in most ferroelectric nematic materials. Here, a polar liquid crystal molecule library containing more than 60 molecules with a highly rigid and fluorinated nature is developed. The introduction of triple bonds constructs a long π‐electron conjugated mesogen skeleton, significantly improving the birefringence of polar liquid crystal phases. The birefringence and dispersion properties are systematically studied, demonstrating a strong dependence on chemical structures and the type of polar phases. Furthermore, through multi‐component mixing, polar liquid crystal mixtures with ultra‐wide temperature range and excellent stability at or near room temperature are obtained. They possess much higher birefringence than the existing ferroelectric liquid crystal materials. The unique combination of high birefringence and fluidic ferroelectricity is expected to promote the application of polar liquid crystals in electro‐optic technologies.
Ferroelectric Nematic Liquid Crystals Showing High Birefringence
Song, Yaohao (Autor:in) / Huang, Xiang (Autor:in) / Zhang, Xinxin (Autor:in) / Deng, Minghui (Autor:in) / Aya, Satoshi (Autor:in) / Huang, Mingjun (Autor:in)
Advanced Science ; 12
01.03.2025
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
COMPOSITE MATERIALS BASED ON FERROELECTRIC NEMATIC LIQUID CRYSTALS AND DEVICES INCLUDING SAME
| Europäisches Patentamt | 2024
COMPOSITE MATERIALS BASED ON FERROELECTRIC NEMATIC LIQUID CRYSTALS AND DEVICES INCLUDING SAME
| Europäisches Patentamt | 2023
The birefringence spectroscopic studies on ferroelectric glycine phosphite (GPI) single crystals
| British Library Online Contents | 2013
Photorefractivity of Nematic Liquid Crystals
| British Library Online Contents | 1999