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An investigation on a novel PDLC film's fabrication and its electro-optical properties

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Science China Chemistry 2007年第3期50卷 358-363页

作者： DING HongLiu, ZHAO Ting, CHENG YuXiao, PANG YueHong, XU He, SHI GuoYue & JIN LiTong Chemistry Department of East China Normal University, Shanghai 200062, China Chemistry Department of East China Normal University Shanghai China

A polymer dispersed liquid crystal (PDLC) film that has good electro-optical properties is produced by the method of polymerized-induced phase separation. Based on the application foreground, its capability parameters, such as contrast ratio, work voltage, and visual angle, are characterized for the first time by a white light but not a fixed wavelength light. The results show the PDLC film has a low work-voltage of 20 V, more than 150° visual angle, high stability, and long lifetime. The differences between plastic and glass ITO-coated substrates of PDLC films are also studied in this paper. The plastic substrate has better property and will have a wider perspective especially in the portable, tender and folded display devices. Due to adjustable properties of film by electric field, PDLC has the potential application for display device, sensor, switch, grating, and new generation analytical apparatus.

关键词： polymer dispersed liquid crystal (PDLC) bisphenol-A epoxy resin nematic liquid crystal electro-optical properties

electro-optical Properties of Carbon Nanotubes Obtained by High Density Plasma Chemical Vapor Deposition

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Materials Sciences and Applications 2011年第5期2卷 381-389页

作者： Ronaldo D. Mansano Ana Paula Mousinho 不详

In this work, we studied the electro-optical properties of high-aligned carbon nanotubes deposited at room temperature. For this, we used the High Density Plasma Chemical Vapor Deposition system. This system uses a new concept of plasma generation: a planar coil is coupled to an RF system for plasma generation. This was used together with an electrostatic shield, for plasma densification, thereby obtaining high-density plasmas. The carbon nanotubes were deposited using pure methane plasmas. Three methods were used for the surface modification of the sample: reference substrate (silicon wafer only submitted to a chemical cleaning), silicon wafer with surface roughness generated by plasma etching, silicon wafer with a thin iron film and silicon wafer with diamond nano powder used as precursor materials. For each kind of silicon wafer surface, the carbon nanotubes were deposited with two different deposition times (two and three hours). The carbon nanotubes structural characteristics were analyzed by Atomic Force Microscope and Scanning electronic Microscope. The carbon nanotubes electrical characteristics were observed by Raman Spectroscopy and the carbon nanotubes electro-optical properties were analyzed by current vs voltage electrical measurements and photo-luminescence spectroscopy measurements. The photoelectric effect in the carbon nanotubes were determined by photo-induced current measurements. In this work, we obtained carbon nanotubes with semiconductor properties and carbon nanotubes with metallic properties. The electro-optical effects depend strongly on the substrate preparation and the deposition parameters of the carbon nanotubes. The carbon nanotubes are high aligned and show singular properties that can be used for many applications.

关键词： Carbon Nanotubes CVD Process electro-optical Properties

Preparation and Microstructural,Structural,optical and electro-optical Properties of La Doped Pmn-Pt Transparent Ceramics

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Optics and Photonics Journal 2012年第3期2卷 157-162页

作者： Fernando Andres Londono Badillo Jose Antonio Eiras Flavio Paulo Milton Ducinei Garcia Ferroelectric Ceramics Group Physics DepartmentFederal University of Sao CarlosSao CarlosBrazil

Transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate have been investigated for a variety of electro-optic properties could make these materials alternatives to (Pb,La)(Zr,Ti)O3. However, a study that relates the properties in function stoichiometric formula, it has not been analyzed heretofore. Therefore, in this work the effect of A-site substitution of La+3 in the characterization microstructural, structural, optical and electro-optical on (1-x)[Pb(1-3/2y)Lay(Mg1/3Nb2/3)O3]-xPbTiO3 and (1-z)[(1-x)Pb(Mg1/3Nb2/3)O3+xPbTiO3]+zLa2O3 has been performed. It was observed that the properties according to the stoichiometric formula and the PT had a maximum whose behavior was related to the addition of lanthanum in each stoichiometries.

关键词： Ferroelectric Optics Transmittance electro-optical

Light absorption coefficients of ionic liquids under electric field

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Chinese Physics B 2019年第1期28卷 608-619页

作者： Ji Zhou Shi-Kui Dong Zhi-Hong He Ju-Lius Caesar Puoza Yan-Hu Zhang Beijing Institute of Space Mechanics&Electricity School of Energy Science and Engineering Harbin Institute of Technology Department of Mechanical Engineering Sunyani Technical University Advancd Manufacturing&Equipment Institute Jiangsu University

Ionic liquids have attracted a lot of research attention for their applications in novel optoelectronic structures and devices as an optical means of regulating electricity. Although the electro-optic effect of ionic liquids is mentioned in some literature, quantitative testing and analysis are hardly found in light absorption coefficients of ionic liquids under an electric field. In the present study, an experimental apparatus is designed to measure the absorption coefficients of ionic liquids under different electric fields. Five groups of imidazole ionic liquids are experimentally investigated and an inversion is performed to determine the spectral absorption coefficients of the imidazole ionic liquids under the electric fields. Different intensities with multiple interface refractions and reflections are also considered, and the various measurement errors are analyzed through uncertainties propagation analysis. Spectral absorptions of ionic liquids from 300 nm to 2500 nm are obtained and the absorption coefficients are retrieved. It is found that the absorption behavior of ionic liquids changes in some frequency bands under an applied electric field. The experimental results show that the absorption coefficient of the ionic liquid increases with the voltage increasing at 1520 nm and 1920 nm. The change rate is affected by the types of anions and cations in the ionic liquid and the diffusion rate of the ions therein. This study provides illustrations for the ionic liquid-based electro-optical regulation in terms of physical property parameters and the testing technique.

关键词： ionic liquid absorption coefficient electro-optical property uncertainty propagation analysis

Refractive index of ionic liquids under electric field:Methyl propyl imidazole iodide and several derivatives

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Chinese Physics B 2020年第4期29卷 477-487页

作者： Ji Zhou Shi-Kui Dong Zhi-Hong He Yan-Hu Zhang Beijing Institute of Space Mechanics&Electricity Beijing 100094China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Advanced Manufacturing&Equipment Institute Jiangsu UniversityZhenjiang 212013China

Ionic liquids have received wide attention due to their novel optoelectronic structures and devices as an optical means of regulating ***,the quantitative testing and analysis of refractive index of ionic liquids under electric field are rarely carried *** the present study,an experimental apparatus including a hollow prism is designed to measure the refractive indices of ionic liquids under different electric *** groups of imidazole ionic liquids are experimentally investigated and an inversion is performed to determine the refractive indices under electric *** error propagation analysis of the apex angle and the minimum deflection angle are conducted,and the machining accuracy requirements of the hollow prism are *** results show that the refractive indices of imidazole ionic liquids change with the light wavelength,following a downward convex ***,the refractive index decreases with the carbon chain length of ionic liquid at a given wavelength,presenting an order of C3MImI>C4MImI>C5MImI>C3MImBr>***,the refractive index of imidazole ionic liquid exhibits a nonlinear change with the applied voltage at 546 nm and a monotonical decrease at 1529 ***,the variation of refractive index at 1529 nm with the applied voltage is larger than that at 546 nm and 1013 ***,the variation of refractive index is contrary to that of absorption coefficient under electric *** study illustrates that the theory of electrode and carrier transport can be used to explain the law of variation of n–k value of ionic liquid under the electric field,and provides the support for the evaluation of physical properties of ionic liquids,the measurement of optical functional parameters and the regulation of electric–optic performances of optical devices.

关键词： ionic liquid refractive index electro-optical property uncertainty propagation analysis

INDIRECT COUPLING PHOTODETECTOR

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Science China Mathematics 1990年第11期33卷 1397-1408页

作者：何民才陈炳若黄啓俊刘国友 Department of Physics Wuhan University Wuhan 430072 PRC

A new idea about indirect coupling photodetectors is proposed. The indirect coupling photodetectors with two different mechanisms have been found and analysed: Experimental results show that they are of a class of exc... 详细信息

关键词： indirect coupling electro-optical signal coupling coefficient spectrum sensitivity intramodulating photodetector.

Sol-Gel Processed Indium-Doped Zinc Oxide Thin Films and Their Electrical and optical Properties

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New Journal of Glass and Ceramics 2014年第4期4卷 55-65页

作者： Radhouane Bel-Hadj-Tahar Abdellatif Belhadj Mohamed Department of Chemistry Faculty of Science King Khalid University Abha KSA Photovoltaic Laboratory Research and Technology Center of Energy Borj-Cedria Science and Technology Park Hammem-Lif Tunisia

Transparent conducting films of zinc oxide and indium-doped zinc oxide have been prepared by a simple and economical sol-gel technique. This process is feasible for the fabrication of high quality TCO thin films when the processing parameters are optimized. It was found that the out-diffusion of oxygen during the vacuum annealing step was a crucial factor to prepare thin layer with superior properties. Annealing lowers the resistivity down to 4.7 10-3?Ω·cm for the 1 at.% doped films due to the liberation of high-valency In-dopants and the enhanced film density. At high indium concentrations, the free electron density stabilizes because an increasing number of dopant atoms form some kinds of neutral defects. The neutralized indium atoms do not contribute free electrons. The feasibility to deposit highly transparent ZnO thin films has been demonstrated.

关键词： Zinc Oxide Doping electro-optical Properties Sol-Gel

可光照调节的自支撑液晶物理凝胶及其电光特性

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可光照调节的自支撑液晶物理凝胶及其电光特性

2015年第十四届全国应用化学年会

作者：欧阳丹赵东旭廖永贵解孝林华中科技大学化学与化工学院大型电池关键材料与系统教育部重点实验室

＜正＞设计并合成了一类含有偶氮苯基团的小分子凝胶因子（AG）,通过分子间的自组装作用,该凝胶因子与向列相液晶P0616A形成了具有自支撑能力的液晶物理凝胶。系统研究了AG含量对液晶物理凝胶（P0616A/AG）相转变行为、凝胶网络结构、... 详细信息

＜正＞设计并合成了一类含有偶氮苯基团的小分子凝胶因子（AG）,通过分子间的自组装作用,该凝胶因子与向列相液晶P0616A形成了具有自支撑能力的液晶物理凝胶。系统研究了AG含量对液晶物理凝胶（P0616A/AG）相转变行为、凝胶网络结构、流变特性及光散射型电光特性的影响。结果表明,随着AG含量增加,液晶物理凝胶的溶胶凝胶相转变温度（Tsol-gel）升高,形成的球晶网络尺寸增大,凝胶的储能模量（G￠）增大。当AG含量达到4wt%时,体系G￠达到104Pa,

关键词： Gelator Liquid crystal physical gel Photoresponse electro-optical response Self- supporting abililty

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光机电信息 2002年第10期19卷 53-53页