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Design of high-contrast Mechanochromic Materials Based on Aggregation-Induced Emissive Pyran Derivatives Guided by Polymorph Predictions

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CCS Chemistry 2022年第3期4卷 899-909页

作者： Wen Wang Ruohan Li Shuzhang Xiao Qilin Xing Xia Yan Jiayu Zhang Xinghong Zhang Haichuang Lan Tao Yi College of Biological and Pharmaceutical Sciences China Three Gorges UniversityHubeiYichang 443002 Department of Chemistry Fudan UniversityShanghai 200438 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai 201620

high-contrast mechanochromic(MC)materials are prominent candidates for sensor,security,and memory applications;however,the development of materials with a large luminescence change(Δλem>100 nm)under external stimuli is *** that polymorphic molecules usually exhibit reversible mechanochromism,polymorph prediction is adopted for thefirst time to guide the design of high-contrastMC materials in this *** designed and synthesized a series of donor–π–acceptor pyran derivatives bearing different electron donors and acceptors as model *** polymorph prediction indicated that 4-dicyanomethylene-2,6-distyryl-4H-pyran and 4H-pyran-4-one derivatives had the potential to crystallize in both monomer andπ-dimer aggregates,while barbituric acid-based compound tended to pack tightly in all aggregated *** experimental results agreed well with the prediction that the derivatives potentially possessing both monomer andπ-dimer aggregate structures exhibit excellent MC behavior,whereas the fluorescence difference for the barbituric acid-based compounds is ***,a compound with an excellent fluorescence difference of three colors during reversible mechanochromism was chosen as the candidate for an optical recording material and security *** work proposes an effective method to guide the design of stimuli-responsive materials,which may open promising avenues for the development of high-contrast MC molecules.

关键词： mechanochromism fluorescence AIE high-contrast polymorph prediction

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Focal plane wave-front sensing algorithm for high-contrast imaging

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Science China(Physics,Mechanics & Astronomy) 2009年第8期52卷 1284-1288页

作者： DOU JiangPei1,2,3,REN DeQing1,2,4,ZHU YongTian1,2 & ZHANG Xi1,2,3 1 National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology,Chinese Academy of Sciences,Nanjing 210042,China 2 Key Laboratory of Astronomical Optics & Technology,Nanjing Institute of Astronomical Optics & Technology,Chinese Academy of Sciences,Nanjing 210042,China 3 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 4 Physics & Astronomy Department,California State University Northridge,18111 Nordhoff Street,Northridge,California 91330-8268,USA National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing China Key Laboratory of Astronomical Optics & Technology Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing China Graduate University of Chinese Academy of Sciences Beijing China Physics & Astronomy Department California State University Northridge Northridge USA

high-contrast imaging provided by a coronagraph is critical for the direction imaging of the Earth-like planet orbiting its bright parent star.A major limitation for such direct imaging is the speckle noise that is induced from the wave-front error of an optical *** derive an algorithm for the wave-front measurement directly from 3 focal plane *** 3 images are achieved through a deformable mirror to provide specific phases for the optics *** introduce an extra amplitude modulation on one deformable mirror configuration to create an uncorrelated wave-front,which is a critical procedure for wave-front *** simulation shows that the reconstructed wave-front is consistent with the original wave-front theoretically,which indicates that such an algorithm is a promising technique for the wave-front measurement for the high-contrast imaging.

关键词： high-contrast imaging multi-image algorithm speckle nulling technique wave-front sensing

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Design and study of a long-wavelength monolithic high-contrast grating resonant-cavity-enhanced photodetector

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Optoelectronics Letters 2019年第4期15卷 250-254页

作者：曾昆段晓峰黄永清刘凯任晓敏 State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

Novel construction of a resonant-cavity-enhanced photodetector(RCE-PD) with monolithic high-contrast grating(HCG)is proposed to overcome the difficulty of fabricating a high reflective mirror of RCE-PD at 1 550 nm. In this structure,HCG serves as the top mirror of the RCE-PD, whereas InGaAs serves as a sacrificial layer to achieve monolithic *** the bandwidth optimization, the ratio of the thickness of the total intrinsic region and the absorption layer is introduced to realize the simultaneous optimization of the thickness of spacing layers and absorption layer. After structural optimization, the quantum efficiency of the device with diameter of 20 μm is 82% at 1 550 nm, and the 3-dB bandwidth is 34 GHz at a bias of 3 V.

关键词： Novel construction resonant-cavity-enhanced photodetector(RCE-PD) high-contrast grating(HCG)

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Generalized Multiscale Finite Element *** Elliptic Equations

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Communications in Computational Physics 2014年第3期15卷 733-755页

作者： Yalchin Efendiev Juan Galvis Guanglian Li Michael Presho Center for Numerical Porous Media(NumPor) King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Department of Mathematics&Institute for Scientific Computation(ISC) Texas A&M UniversityCollege StationTexas 77843USA Departamento de Matem´aticas Universidad Nacional de ColombiaBogot´a D.C.Colombia

In this paper we use the Generalized Multiscale Finite Element Method(GMsFEM)framework,introduced in[26],in order to solve nonlinear elliptic equations with high-contrast *** proposed solution method involves linearizing the equation so that coarse-grid quantities of previous solution iterates can be regarded as auxiliary parameters within the problem *** this convention,we systematically construct respective coarse solution spaces that lend themselves to either continuous Galerkin(CG)or discontinuous Galerkin(DG)global ***,we use Symmetric Interior Penalty Discontinuous Galerkin *** methods yield a predictable error decline that depends on the respective coarse space dimension,and we illustrate the effectiveness of the CG and DG formulations by offering a variety of numerical examples.

关键词： Generalized multiscale finite element method nonlinear equations high-contrast

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有限动态范围内高对比度原件的登记和复制方法（英文）

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出版与印刷 2015年第4期 27-31页

作者： I.L.Artyushina R.J.Akhtariev A.I.Vinokur Moscow State University of Printing Arts

In this paper is considered the reproduction process of high-contrast objects in systems with limited dynamic *** was proposed an algorithm of forming of high-contrast digital original,

关键词： registration and reproduction high-contrast originals systems methods

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