Article
Chemistry, Applied
Seung-Won Oh, Seong-Min Ji, Chan-Hee Han, Tae-Hoon Yoon
Summary: A dye-doped cholesteric liquid crystal smart window with a haze-free opaque state is demonstrated. The window utilizes a random stripe pattern called the fingerprint (FP) texture as its initial state, which has a slightly higher transmittance than the twisted state but much lower than the homogeneously aligned state. Additionally, the proposed LC cell shows the lowest operating voltage among guest-host liquid crystal cells due to vertical anchoring at the surfaces.
Article
Chemistry, Physical
Yi-Cheng Chang, Sheng-Hsiung Yang, Victor Ya. Zyryanov, Wei Lee
Summary: We have demonstrated a cholesteric liquid crystal (CLC) smart window that can switch between transparent and low-transmission states reversibly based on thermo-optic effect. This smart window utilizes a thermoresponsive handedness-reversible chiral dopant in a mixture of chiral dopant, dichroic dye and nematic liquid crystal to create a thermosensitized CLC. By increasing the temperature, the device switches from a homeotropic texture to a fingerprint texture. The absorption characteristic of the dichroic dye enables the CLC to have two distinct transmission levels.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Jiaqi Wang, Cuiling Meng, Chun-Ta Wang, Chia-Hua Liu, Yong-Hsiang Chang, Cheng-Chang Li, Heng-Yi Tseng, Hoi-Sing Kwok, Yunlong Zi
Summary: This work presents a fully self-powered smart window that can switch between transparency and haze states triggered by instantaneous mechanical stimuli, without the need for external power supply. The window demonstrated in this work has the potential for indoor temperature modulation and battery-free privacy information protection, benefiting various fields such as self-powered sunroofs and privacy protection systems.
Article
Chemistry, Applied
Hongbo Lu, Mengmeng Zhu, Ying Cao, Chao Ma, Longzhen Qiu, Jun Zhu, Miao Xu
Summary: A fast-relaxation dye-doped cholesteric liquid crystal (DDCLC) smart window without any defects is prepared by doping CB7CB, a liquid crystal dimer with low bend elastic constants. By adjusting the ratio of bend elastic constant to twist elastic constant to unity, the relaxation time from the homeotropic state to the planar state is greatly reduced. The oily streaks of the planar state are removed and light scattering is lessened.
Article
Materials Science, Multidisciplinary
Yuzhen Zhao, Min Zhu, Yang Zhao, Zemin He, Huimin Zhang, Cheng Ma, Yongming Zhang, Zongcheng Miao
Summary: This study investigates the improvement of visible light reflection efficiency by introducing a fluorescence dye-coated layer to cholesteric liquid crystal displays. The performance of the films is studied at different dye concentrations, and demonstration of reflective displays based on optimized dye-coated PSBCLC films is presented.
Article
Chemistry, Multidisciplinary
Bojun Zhou, Chuncheng Che, Yue Li, Chunlei Wang, Yifan Wu, Wenbo Chang, Yuelei Xiao, Xue Cao, Gong Lin, Xuechao Song, Yi Zhou
Summary: The paper introduces a dual-cell smart window based on dichroic-dyed-doped liquid crystal, demonstrating its capability to switch among transparent, dark, and scattering states. Various characterizations, including ion concentration, voltage holding ratios, and POM observations, are conducted, along with measurements of polarized and non-polarized voltage-transmittance and haze characteristics. The increase in transmittance of the dual cell after the Freedericksz regime is explained and verified through simulations, with the investigation of the triggering threshold voltage for electrohydrodynamic instabilities under different conditions.
Article
Materials Science, Multidisciplinary
Ridhima Gahrotra, Vandna Sharma, Ankit Rai Dogra, Praveen Malik, Pankaj Kumar
Summary: In this article, bistable cholesteric liquid crystal (CLC) light shutters were fabricated and the effect of dichroic dye on their properties was studied. The results showed that the dye-doped light shutter had lower operating voltage and better performance parameters.
Article
Nanoscience & Nanotechnology
Saddam Hussain, Soo-Young Park
Summary: The unique combination of photonic helicoidal structure and rubber-like properties in cholesteric liquid-crystal elastomers results in a highly stretchable mechanochromic film capable of reflecting both right- and left-handed circular polarized light. The patterned photonic CLCE film, controlled by applied strain, can encrypt data and camouflage itself under unpolarized daylight. These elastomers have potential applications in sensors, robotics, displays, encryption, and anti-counterfeiting due to their mechanochromic capabilities.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Amid Ranjkesh, Yeongyu Choi, Jae-Won Huh, Seung-Won Oh, Tae-Hoon Yoon
Summary: A flexible cholesteric liquid crystal (CLC) polymer reflector is proposed in this study to selectively control the reflection of infrared (IR) light, effectively lowering indoor temperature. The fabricated IR reflector demonstrates thinness, high mechanical stability, flexibility, durability, resistance to solvents and acids, high transparency, and low haze in visible light. This innovative approach shows promise for applications in anti-IR devices, energy-saving windows for cars, and modern building facades.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Multidisciplinary
Yang Li, Yihan Chen, Hang Li, Chao Liu, Lulu Li, Yiwu Quan, Yixiang Cheng
Summary: Cholesteric liquid crystal platforms have achieved high-performance circularly polarized luminescence (CPL) through the organized arrangement of achiral dyes. This study developed a regulation strategy for CPL-active CLC materials by using the orientational order parameter of achiral dichroic dyes. The results showed that increasing the order parameter value of the dichroic dye improved the CPL emission and contrast ratio in CLC, opening a new avenue for developing excellent CPL-active display materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Xiaoshuai Li, Meishan Zhang, Chi Zhang, Rui Niu, Hongmei Ma, Yubao Sun
Summary: This paper presents a bistable polymer-stabilized ion-doped cholesteric liquid crystal device, which greatly enhances the light scattering capabilities of the focal conic state with the introduction of a small amount of polymer network, and exhibits excellent electro-optic performance. The rotational viscosity of the liquid crystal and the pitch induced by the chiral dopant affect the formation process of the polymer network, thereby influencing the electro-optical properties. This bistable device has a low driving voltage and a high contrast ratio, making it ideal for use in smart windows.
Article
Polymer Science
Anna P. Gardymova, Mikhail N. Krakhalev, Victor Ya. Zyryanov, Alexandra A. Gruzdenko, Andrey A. Alekseev, Vladimir Yu. Rudyak
Summary: Studies have shown that twisted toroidal liquid crystal droplets exhibit strong structural response to an electric field, leading to changes in optical texture. Droplets of different sizes show equivalent responses to the electric field, and the addition of dye allows the films to function as adjustable color optical filters.
Article
Chemistry, Multidisciplinary
Zhuohao Zhang, Zhuoyue Chen, Yu Wang, Yuanjin Zhao, Luoran Shang
Summary: This study introduces a novel composite cellulose cholesteric liquid crystals as a bionic prototype for biological structural coloration, allowing for color range adjustments and dynamic control. By incorporating polymer monomers and crosslinking polymers, a series of structural color materials with high-resolution patterns have been developed, showing potential applications in wearable sensors, graphic displays, and information encryption.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fan Zhou, Ruochen Lan, Zhi Li, Bingyao Liu, Qin Xie, Jinying Bao, Junling Liu, Peng Gao, Huai Yang, Yanfeng Zhang, Zhongfan Liu
Summary: A new thermochromic light modulator is developed by combining the electro-heating capability of graphene and unique optical properties of small-molecule-weight cholesteric liquid crystal (ChLC). The modulator allows actively tunable color filtering with widely adjustable hue and saturation properties. Potential applications in smart windows and photography are demonstrated.
Article
Chemistry, Physical
Hyo-Jin Hong, Aboozar Nasrollahi, Soo-Young Park
Summary: An optically transparent bilayer cholesteric liquid crystal (CLC) solid film was successfully fabricated, capable of almost completely rejecting UV-A light with over 98% UV blocking and over 95% transparency in the visible region. The proposed approach provides a simple and reliable fabrication process suitable for practical applications such as smart windows, eyeglasses, and lenses.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Physics, Multidisciplinary
Jiyong Hwang, Seungbin Yang, Hyojin Lee, Jongyoon Kim, Ji-Hoon Lee, Shin-Woong Kang, E-Joon Choi
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2015)
Article
Polymer Science
Dong-Gue Kang, Dae-Yoon Kim, Minwook Park, Yu-Jin Choi, Pureun Im, Jong-Hoon Lee, Shin-Woong Kang, Kwang-Un Jeong
Article
Chemistry, Physical
Dae-Yoon Kim, Sang-A Lee, Minwook Park, Yu-Jin Choi, Shin-Woong Kang, Kwang-Un Jeong
Article
Multidisciplinary Sciences
Soo-Dong Kim, Bomi Lee, Shin-Woong Kang, Jang-Kun Song
NATURE COMMUNICATIONS
(2015)
Article
Optics
Pankaj Kumar, Su Yeon Oh, Vijay K. Baliyan, Sudarshan Kundu, Seung Hee Lee, Shin-Woong Kang
Article
Physics, Applied
Shin-Woong Kang, In Won Jang, Dae Hyung Kim, Young Jin Lim, Seung Hoe Lee
JAPANESE JOURNAL OF APPLIED PHYSICS
(2014)
Article
Chemistry, Multidisciplinary
Shin-Woong Kang, Young Eun Choi, Byeong Hoon Lee, Jun Hee Lee, Sudarshan Kundu, Heui-Seok Jin, Yong Kuk Yun, Seung Hee Lee, L. Komitov
Article
Chemistry, Multidisciplinary
Shin-Woong Kang, Ji-Hoon Lee
Article
Materials Science, Multidisciplinary
Vineet Kumar, Aboozar Nasrollahi, Vijay Kumar Baliyan, Heung-Shik Park, Myong-Hoon Lee, Shin-Woong Kang
OPTICAL MATERIALS EXPRESS
(2018)
Article
Nanoscience & Nanotechnology
Aboozar Nasrollahi, Vineet Kumar, Myon-Hoon Lee, Shin-Woong Kang, Heung-Shik Park, Ho Lim, Keun Chan Oh, Jae Jin Lyu
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Subhangi Subedi, Avinash K. Rella, Le Gia Trung, Vineet Kumar, Shin-Woong Kang
Summary: This study reports the synthesis of anisometric carbon quantum dots (CQDs) and the macroscopic control of their uniaxial orientation, resulting in linearly polarized photoluminescence (LP-PL). The as-synthesized CQDs exhibit a high PL quantum yield. The elongated CQDs can be directionally switched using the electrical responsiveness of the CQDs and the liquid crystal host. The anisometric CQDs have been successfully adopted for the fabrication of polarization-sensitive and electrically switchable PL devices.
Article
Chemistry, Multidisciplinary
Avinash Kumar Rella, Subhangi Subedi, Le Gia Trung, Vineet Kumar, Suhyun Kim, Shin-Woong Kang
Summary: Photonic crystals have great importance in technology, especially in optics and photonics. The authors report on refractive index adaptive photonic crystals, where the structural color responds to chemicals by changing the reflective color. Loading various chemicals into nanopores significantly shifts the structural color based on the chemical's refractive index. This sensing mechanism offers advantages such as durability, sensitivity, fast response, and wide detection range.
Article
Materials Science, Multidisciplinary
Vijay Kumar Baliyan, Seung Hee Lee, Shin-Woong Kang
NPG ASIA MATERIALS
(2017)
Article
Materials Science, Multidisciplinary
Aboozar Nasrollahi, Vineet Kumar, Myong-Hoon Lee, Shin-Woong Kan
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Article
Chemistry, Applied
Leping Chen, Yanfen Wang, Tingyu Shi, Tiantian Ma, Yang Li, Huayu Qiu, Shouchun Yin, Meier Gu
Summary: This study successfully overcame the limitations of the heavy atom effect by introducing iodine atoms and innovatively enhancing the structure while weakening stacking behavior, achieving high efficiency and precision in photodynamic therapy and photothermal therapy.
Article
Chemistry, Applied
Bingpeng Guo, Honghan Sa, Peng Zhang, Guiwen Hao, Mengyu Li, Qingqing Jiang, Baoying Li, Wei Shu, Changxiang Shao
Summary: The design of ratiometric fluorescence probes with large Stokes shift is of great significance in detecting and imaging target substances in complex organisms. In this study, a novel fluorophore with a large Stokes shift was easily obtained, and a fluorescence probe based on it demonstrated rapid response, high selectivity, and sensitivity towards peroxynitrite. The probe also showed excellent biocompatibility and remarkable mitochondrial targeting ability, making it suitable for proportional imaging of peroxynitrite in living cells and zebrafish.
Review
Chemistry, Applied
Haidong Huang, Xiaohui Wang, Xinyang Li, Yichen Li, Guojin Liu, Lan Zhou, Jianzhong Shao
Summary: This article introduces the application of responsive photonic crystals in anti-counterfeiting technology, with a focus on the preparation principle, classification, and preparation methods.
Article
Chemistry, Applied
Yunpeng Wang, Tao Zhao, Xiaoye Bi, Chencheng Lv
Summary: In this study, three novel carbene dyes were designed to achieve environmentally friendly dyeing processes. The dyes formed covalent bonds with fibers and exhibited good dyeing performance and high color fastness. These findings highlight the potential of the novel carbene dyes in promoting green production in the textile industry.
Review
Chemistry, Applied
Yizhe Yan, Xiaopei Zhu, Jia-Xin Cao, Yuan He, Shaoqing Li, Jian-Yong Wang
Summary: In this paper, 1,3,5-triazine dyes were successfully synthesized and their photophysical properties were studied. Two probes were selected for further investigation, showing promising applications in various fields.
Article
Chemistry, Applied
Xin Hu, Tongsheng Huang, Lihua Chen, Weifeng Zhu, Fengjie Deng, Xiancai Li, Jianwen Tian, Meiying Liu, Xiaoyong Zhang, Yen Wei
Summary: This study presents the synthesis of fluorescent cyclomatrix polyphosphazene spheres with aggregation-induced emission (AIE) feature and biodegradable potential for controlled drug delivery. The resulting micelles exhibit high water dispersibility, desirable fluorescence performance, and high drug loading capacity. They can effectively release the encapsulated drug in physiological solution and show excellent biological imaging ability and cytotoxicity against cancer cells.
Article
Chemistry, Applied
Yanzhu Liu, Yanghui Lei, Dongyan Li, Guangkui Li, Dongping Li, Yongxiu Li
Summary: In this study, luminescent lanthanide nanoparticles were synthesized as a dual emission turn-off probe for detecting 2,6-pyridinedicarboxylic acid (DPA) in water. The nanoparticles showed good dispersion and water stability, and achieved low detection limits for DPA. They also exhibited high recoveries in various samples.
Article
Chemistry, Applied
Jung Jae Do, Jong Ryeol Kwon, Donghan Kim, Jae Woong Jung
Summary: This study presents a defect passivation approach using coumarin dye as a multi-functional passivating agent of perovskite films to boost power conversion efficiency and operating stability of PSCs. The incorporation of coumarin dye improves the film morphology, enhances carrier extraction/transport, and suppresses trap-assisted recombination in the perovskite films. The optimized device demonstrates impressive reliability and practical applicability, maintaining over 90% of its initial PCE after being exposed to continuous indoor lighting irradiation for 2000 hours.
Article
Chemistry, Applied
Gang Wang, Yu-Chang Wang, Jing Lu, Wen-Fu Yan, Juan Jin, Yuan-Peng Wang, Jia-Jia Zhang, Hui-Jie Zhang, Hao Dong, Xi-Guang Liu
Summary: A new Ni(II) compound with good solid-state fluorescence performance and stability was synthesized, and it showed outstanding detection properties for various substances in aqueous solutions. This compound has the potential to be a multifunctional sensor.
Article
Chemistry, Applied
Luyao Wei, Shenglong Shang, Yu Zheng, Jie Liu, Ping Zhu
Summary: This study developed a facile method to create high saturation and durable structural colors on cotton fabrics. The colors are regulated by adjusting the size of magnetic particles and can be conveniently printed on fabrics using photo masks on transparent films.
Article
Chemistry, Applied
Zhao Jiang, Qing Zhang, Zhaoyu Kong, Ruijie Qiao, Zichuan Liu, Linzhou Song, Senqiang Zhu, Rui Liu, Hongjun Zhu
Summary: Three heteroleptic Ir(III) complexes with different electron-donating aryl groups were synthesized and their optical properties were investigated. It was found that all three complexes exhibited aggregation-induced phosphorescence emission (AIPE) behaviors, and the relationship between the size of organic ligands and AIPE behaviors was characterized. Ir-PhCz showed the best imaging of latent fingerprints due to its green light emission and high quantum yield.
Article
Chemistry, Applied
Zhijun Ruan, Chunxia Fan, Xuanrong Wang, Dong Shao, Xiaodong Yang, Wentao He, Tao Xu, Junqi Lin, Zhengfang Tian
Summary: A novel thioketal-based probe has been designed for rapid and accurate detection of mercury (II) ions, showing different fluorescence characteristics in various states. The probe exhibits excellent selectivity and specificity, making it suitable for Hg2+ detection in water solutions.
Article
Chemistry, Applied
Jianjun Huang, Xuan Zhao, Daniel Escudero, Luc Van Meervelt, Dongbin Zheng, Yuyu Fang, Wim Dehaen
Summary: A series of BOAHY compounds were successfully synthesized and showed versatile applications as a platform for designing novel fluorescent probes, especially in selective recognition.
Article
Chemistry, Applied
Roman V. Larkovich, Victoria E. Shambalova, Savva A. Ponomarev, Alexander S. Aldoshin, Boris N. Tarasevich, Konstantin A. Lyssenko, Valentine G. Nenajdenko
Summary: An efficient synthetic protocol for the preparation of novel 1,7-difluorinated BODIPYs was elaborated. Their photophysical properties were studied and the effect of 2,6-substituents was evaluated using DFT calculations.
Article
Chemistry, Applied
Haneul Kim, Byungjin Koo
Summary: In this study, a lithium ion sensing methodology based on fluorinated naphthalene compounds using 19F NMR and UV-vis spectroscopy is reported. The binding of lithium ions to the compounds is confirmed by changes in chemical shifts and peak broadening. Additionally, the effect of different crown ether ring sizes on the binding ability is observed. This study provides a new method for lithium ion sensing using spectroscopy.