LIQUID CRYSTALS
·
2024
·
IF 2.4
Jinghua Zhao,Yajie Yang,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Both the colourful cholesteric liquid crystal polymer network (CLCN) patterns and the gratings have attracted much attention for their applications as optical materials. Herein, the photochromic cholesteric liquid crystal (CLC) mixtures were prepared using a photoisomerizable chiral dopant. The structural colour of the CLC mixtures was tunable by changing the chiral dopant concentration and the intensity of the 365-nm irradiation light. The CLCN gratings with a structural colour were prepared using the UV nanoimprinting lithography method. The structural colours of the CLCN gratings originate from both the cholesteric and the grating structures. Moreover, a patterned CLCN grating was prepared using a photochromic CLC mixture, which could be applied for decoration and anti-counterfeiting.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4598-4605
·
IF 2.7
Yongxing Guo,Jinghua Zhao,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Cholesteric liquid crystal polymer network (CLCN) films have attracted much attention for their applications as optical filters and in displays, decoration, and anti-counterfeiting. Herein, two pairs of chiral bola-type epoxy liquid crystals with a cholesteric mesophase were synthesized. Their mixtures exhibit thermochromic behaviour. CLCN films with structural colours were prepared using their mixtures through photopolymerization. The Bragg reflection band and the handedness of the CLCN film can be controlled by changing the weight ratio of the chiral liquid crystals. Patterned CLCN films were prepared based on their thermochromic behaviour, the addition of a luminescent compound, or the handedness of the liquid crystal mixture, and they were potentially applied in decoration and anti-counterfeiting.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 20
·7063
·
IF 4.6
Yutong Liu,Rui Han,Xiaohui Zhao,Yue Cao,Hui Cao,Yinjie Chen,Zhou Yang,Dong Wang,Wanli He
This paper focuses on preparing broadband reflective liquid crystal films through the diffusion of monofunctional and bifunctional monomers in a photoinduced trilayer system. By combining the hydrophilic and hydrophobic liquid crystal glass surface treatment technologies, the polymer network of polymer-stabilized cholesteric liquid crystal (PSCLC) itself serves as a diffusion channel to form a trilayer cholesteric liquid crystal composite system containing bifunctional monomers, a nematic liquid crystal composite system, and a cholesteric liquid crystal composite system containing monofunctional monomers. Utilizing the difference in the polymerization rates of monofunctional and difunctional polymerizable monomers, the monomers and chiral compounds diffuse relative to each other, so that the liquid crystal pitch exhibits a gradient distribution, and the broadened reflective width can reach up to 1570 nm. There is no doubt that new and improved processes and technologies offer important possibilities for preparing and applying PSCLC films.Keywords:cholesteric liquid crystal;broadband reflection;pitch gradient;photoinduced diffusion
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GIANT
·
2024
·
IF 5.4
Jinghua Zhao,Ming Zhang,Yongxing Guo,Wei Liu,Yi Li,Yonggang Yang
Colorful cholesteric liquid crystal polymer network (CLCN) patterns can be applied for decoration and anti-counterfeiting. Herein, the CLC inks were prepared using an acrylate liquid crystal, chiral dopants and a photoinitiator. Full-color CLCN patterns were able to be printed out using only two CLC inks by changing their volume ratio. A structure with a gradient helical pitch was identified between different colors. For anti-counterfeiting, the color patterns composed of opposite-handed CLCNs were also printed. A helical-nonhelical-helical structure was identified at the interface. In addition, CLCN patterns with a grating structure were also prepared. The results shown here not only give us a better understanding the cholesteric structure, but also lay the foundations for the applications of CLCN patterns in the fields of decoration and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Optics Letters
·
2020
·Vol. 18
·期 10
·101202
·
IF 2.045
Hai Zhang,Jianyu Shang,Xiujuan Liu,Weimin Sun,Feiru Wang,Yongjun Liu,Yongjun Liu
This Letter presents a new type of optical fiber probe used to detect temperature, whose structure is very simple. The optical fiber probe is filled with cholesteric liquid crystals (CLCs) whose reflected light varies with temperature. The experimental results show that the proposed sensor can achieve a temperature sensitivity of 5.64 nm/°C in the temperature range of 18–40°C. The sensor has the advantages of simple structure, low cost, and easy mass manufacture. Its size is very tiny (the tapered structure, 125 μm in maximum diameter and <300 μm in length) and it is easy to integrate and measure. Meantime, the tapered structure of the probe is also ideal for measuring small samples such as cells and microfluidic channels, which will be a promising candidate for monitoring temperature fluctuations in small spaces.
研究领域:
光学
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材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chenlin Wang,Wei Zhang,Haixiao Zhao,Baoqing Sun,Xian Zhao,Dan Luo,Yuan Gao
Circularly polarized light (CPL) is vital for optical communication, quantum information, 3D displays, and bioimaging. Traditional CPL generation using linear polarizers and quarter-wave plates suffers from significant energy loss. Here, we present a chiral vertical-cavity surface-emitting laser (VCSEL) by integrating face-down aligned CdSe/CdZnS colloidal quantum wells (CQWs, also known as nanoplatelets) with a cholesteric liquid crystal (CLC)-based distributed Bragg reflectors (DBRs). The CLC reflectors selectively reflect CPL matching their handedness, enhancing lasing, and ensuring a dominant output of the same handedness. The face-down aligned CQWs offer i) directional emission for precise spectral matching with the CLC-DBR stop band and ii) optimized light-matter coupling via dipole alignment with cavity modes. This leads to a lower lasing threshold and high polarization dissymmetry, achieving a |g-factor| of 1.9. The lasing process further amplifies circular polarization asymmetry, increasing the right-CP ( R -CP) to left-CP ( L -CP) intensity ratio from 0.21 in fluorescence to 41.7 in lasing. Furthermore, we demonstrate flexible chiral VCSELs with mechanically tunable emission wavelengths while maintaining performance. Our approach provides an efficient and customizable strategy for next-generation high-purity CPL sources, paving the way for advanced photonic applications.
研究领域:
光学
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材料科学
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量子信息科学
✓ 已验证
产品关联
DOI
高影响因子
Battery Energy
·
2025
·
IF 9.9
Yuzhen Zhao,Dongliang Yang,Yinfu Lu,Kexuan Li,Zhun Guo,Jianjing Gao,Ruijuan Yao,Dong Wang,Yi Luan,Hong Gao
Cholesteric liquid crystal (CLC) materials with broadband reflective properties have garnered much attention because of their light-selective reflective properties. In this study, broadband reflective films were prepared by doping a novel UV absorber, ZIF-8, into a CLC system to take advantage of the formation of a UV intensity gradient. The effects of ZIF-8 content, C6M content, UV intensity, UV irradiation time, and diffusion temperature on the reflection bandwidth of the samples were systematically investigated. The reflection bandwidth was expanded from 277 to 429 nm under optimum conditions. In addition, the ZIF-8-doped broadband reflective films not only have IR thermal control and UV shielding capabilities but also have the optical property of third-order nonlinear saturable absorption, which makes the preparation of multifunctional broadband reflective films possible. The above results show that the developed thin films have a broad application prospect in building energy saving, UV protection, and laser protection.
研究领域:
材料科学
·
光学
·
能源与环境
✓ 已验证
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2023
·
IF 0.7
Yajie Yang,Jinghua Zhao,Wei Liu,Yi Li,Yonggang Yang
A cholesteric liquid crystal (CLC) mixture was prepared using a photoisomerizable chiral dopant and acrylates. With extending the irradiation time of a 365-nm UV light, the Bragg reflection band of the CLC mixture shifted to long wavelength. After photopolymerization, a polymer-stabilized CLC (PSCLC) film was obtained. The colorful PSCLC patterns with glass microspheres on the surface were prepared by controlling the competition between the photoisomerization of the chiral dopant and the photopolymerization of the acrylates. Due to the retroreflective property, the patterned PSCLC films can be applied as the traffic signs and for advertisement.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2023
·
IF 2.2
Yongxing Guo,Jinghua Zhao,Limin Wu,Wei Liu,Yi Li,Yonggang Yang
Double-layered polymer-stabilised cholesteric liquid crystal (PSCLC) films constructed from epoxy resin and polyacrylate were prepared based on photopolymerisation-induced phase separation. Moreover, a PSCLC film with an interpenetrating network was prepared through a one-step photopolymerisation approach. A colourful pattern was prepared based on these two approaches, which was suitably applied for decoration.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Zhitao Li,Dong Wang,Hong Gao,Hui Cao,Yuzhen Zhao,Zongcheng Miao,Zhou Yang,Wanli He
Cholesteric liquid crystal (CLC) exhibits selective reflection, making it a great application in the field of light control. Here, a near-infrared light (NIR) was used to drive the self-organizing spiral superstructure of the cholesteric liquid crystal to adjust the reflection notch. The polymer dye M2 with near-infrared absorption properties was synthesized by thiol-ene click polymerization and [2 + 2] click reaction; and has good solubility in the CLC system. M2 absorbs near-infrared light to increase the temperature of the system and the temperature-sensitive chiral dopant CD can realize the photothermal tuning of CLC system by the spiral twisting force of CLC with the change of temperature. The use of near-infrared light is beneficial compared to ultraviolet (UV) and visible light because of its invisibility, high penetration and ease of remote control. The entire CLC system has good near-infrared absorption, fast light response and a wide adjustable range.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 4
·2202141
·
IF 10.05
Yangsong Pan,Shuting Xie,Haoyu Wang,Linwei Huang,Shitao Shen,Yueming Deng,Qilin Ma,Zhenping Liu,Minmin Zhang,Mingliang Jin,Lingling Shui
As alternatives to electronic devices, optically active structures from responsive nanomaterials offer great opportunity for building up smart functional sensors. This work reports on the construction and application of photonic microcapsules (PMCs) for colorimetric temperature microsensors, enabling miniaturization for injectable local micro-area sensing and integration for large-area sensing. Monodispersed PMCs are produced by in situ photopolymerization of hydrogel shells of cholesteric liquid crystal (CLC)-in-water-in-oil double emulsion droplets prepared using microfluidic devices, with controllable physical structures and chemical compositions. Constructed PMCs exhibit thermal responsive structural color according to the selective Bragg reflection of CLC's periodical helical structures within the microdroplet's spherical confinement. CLC mixtures with phase transition temperature of 56.0 and 37.8 °C have been prepared and employed to construct PMCs exhibiting obviously visible and quantifiable optical response in 52–56 and 33–38 °C, respectively. The PMCs have been successfully applied for monitoring the living cell extracellular temperature via co-incubation with cell suspension, and for sensing human forehead temperature via a flexible device from assembled PMCs. These PMCs can be flexibly applied in either micro-environment or large-area surface, enabling wide applications for a precision temperature monitoring of biological activities (e.g., cells or organs), optoelectronic devices working conditions (e.g., temperature indicators under extreme conditions), etc.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 7
·2200915
·
IF 4.6
Qian Jiang,Huan Ruan,Chenchen Sun,Tian Wang,Yuping Zhang,Yuan Qiu,Hong Wang,Yonggui Liao,Xiaolin Xie
Bright structural color derived from the unique helical superstructure of cholesteric liquid crystals (CLCs) has attracted much attention. In addition, fluorescence color is an intrinsic emission upon excitation, which can be observed often under UV light. However, it is a challenge to combine the fluorescence and structural colors to construct a self-supporting system at the same time. In this work, a photoresponsive cyanostilbene-based gelator (CSpy-C10) is synthesized, which emits blue fluorescence in LC. CSpy-C10 can gel LCs and further construct thermo-/photoresponsive CLC physical gels. The structural color of the CLCs, fluorescence, and mechanical properties of the gels can be independently regulated due to the separation of the chiral unit and photoresponsive unit with aggregation-induced emission behavior. Finally, the reversible information encryption including writing and erasing based on the changes in fluorescence are explored. This kind of two-color material can be applied in the fields ranging from information encryption, fluorescent display to high-tech anticounterfeiting.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）