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Fabrication of high-performance non-doped OLEDs by combining aggregation-induced emission and thermally activated delayed fluorescence

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Science China Chemistry 2017年第8期60卷 1107-1108页

作者： zhen li Department of Chemistry Hubei Key Laboratory on Organic and Polymeric Opto-Electronic Materials Wuhan University Wuhan 430072 China

Undoubtedly,the realization of"one stone and two birds"is ideal,which is also applicable to the molecular design in the pursuit of excellent ***,this standpoint has been confirmed again by an interesting story written from the lab of Zujin Zhao,Shi-Jian Su,and BenZhong Tang,at South China University of Technology and the Hong Kong University of Science and Technology,in the design of DBT-BZ-DMAC(Figure 1)[1].Despite its simple structure,DBT-BZ-DMAC exhibits wonderful characteristics,

关键词： OLEDs for on of Fabrication of high-performance non-doped OLEDs by combining aggregation-induced emission and thermally activated delayed fluorescence by high

AIE probes towards biomolecules: the improved selectivity with the aid of graphene oxide

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Science China Chemistry 2015年第12期58卷 1800-1809页

作者： Qianqian li zhen li Hubei Key Laboratory on Organic and Polymeric Opto-Electronic Materials

Fluorescence probes with aggregation-induced emission(AIE) property have attracted much research interest and have been identified as novel fluorescence biosensors with "turn-on" response. In this mini review, we present an overview of the recent work on improving the selectivity of AIE biosensors with the aid of graphene oxide(GO), according to the displacement strategy.

关键词： aggregation-induced emission biosensor selectivity graphene oxide displacement strategy

Effects of relaxation time on start-up time for starting flow of Maxwell fluid in a pipe

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Acta Mechanica Sinica 2010年第2期26卷 209-215页

作者： zhen li Keqin Zhu Department of Engineering Mechanics Tsinghua University 100084 Beijing China

Although the analytical solution of the starting flow of Maxwell fluid in a pipe has been derived for a long time, the effect of relaxation time λ on start-up time ts of this flow is still not well understood. Especially, there exist a series of jumps on the ts-λ. curve. In this paper we introduce a normalized mechanical energy by mode decomposition and mathematical analogy to describe the start-up process. An improved definition of start-up time is presented based on the normalized mechanical energy. It is proved that the ts-λ. curve contains a series of jumps if λ is larger than a critical value. The exact positions of the jumps are determined and the physical reason of the jumps is discussed.

关键词： Maxwell fluid Starting flow·Relaxation time·Start-up time·Mechanical energy

Development of aggregated state chemistry accelerated by aggregation-induced emission

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National Science Review 2021年第6期8卷 20-22页

作者： Yujun Xie zhen li Institute of Molecular Aggregation Science Tianjin University Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Department of Chemistry Wuhan University

light is an essential ingredient of human civilization, and has been tightly associated with society and everyone’s daily life. light can be emitted from various kinds of luminophores, and the concept of aggregation-induced emission(AIE)was a breakthrough in the field of organic light-emitting materials, which experienced stages of pursuing truth, discarding prejudices and creating new knowledge.

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Rethinking resolution estimation in fluorescence microscopy: from theoretical resolution criteria to super-resolution microscopy

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Science China(life Sciences) 2020年第12期63卷 1776-1785页

作者： Mengting li zhen-li Huang Britton Chance Center for Biomedical Photonics.Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology Wuhan 430074.China MoE Key Laboratory for Biomedical Photonics Collaborative Innovation Center for Biomedical Engineering.School of Engineering Sciences.Huazhong University of Science and TechnologyWuhan 430074China School of Biomedical Engineering Hainan UniversityHaikou 570228China

Resolution is undoubtedly the most important parameter in optical microscopy by providing an estimation on the maximum resolving power of a certain optical microscope. For centuries, the resolution of an optical microscope is generally considered to be limited only by the numerical aperture of the optical system and the wavelength of light. However, since the invention and popularity of various advanced fluorescence microscopy techniques, especially super-resolution fluorescence microscopy, many new methods have been proposed for estimating the resolution, leading to confusions for researchers who need to quantify the resolution of their fluorescence microscopes. In this paper, we firstly summarize the early concepts and criteria for predicting the resolution limit of an ideal optical system. Then, we discuss some important influence factors that deteriorate the resolution of a certain fluorescence microscope. Finally, we provide methods and examples on how to measure the resolution of a fluorescence microscope from captured fluorescence images. This paper aims to answer as best as possible the theoretical and practical issues regarding the resolution estimation in fluorescence microscopy.

关键词： fluorescence microscopy super-resolution microscopy Abbe limit Rayleigh criterion image resolution

Molecular dynamics simulations of membrane deformation induced by amphiphilic helices of Epsin,Sar1p,and Arf1

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Chinese Physics B 2018年第3期27卷 544-550页

作者： zhen-Lu li Department of Physiology and Biophysics Case Western Reserve UniversityCleveland 44106USA Department of Physics Nanjing UniversityNanjing 210093China

The N-terminal amphiphilic helices of proteins Epsin,Sarlp,and Arfl play a critical role in initiating membrane *** interactions of these amphiphilic helices with the lipid membranes are investigated in this study by combining the all-atom and coarse-grained *** the all-atom simulations,the amphiphilic helices of Epsin and Sarlp are found to have a shallower insertion depth into the membrane than the amphiphilic helix of Arfl,but remarkably,the amphiphilic helices of Epsin and Sat lp induce higher asymmetry in the lipid packing between the two monolayers of the *** insertion depth of amphiphilic helix into the membrane is determined not only by the overall hydrophobicity but also by the specific distributions of polar and non-polar residues along the *** directly compare their ability to deform the membrane,the coarse-grained simulations are performed to investigate the membrane deformation under the insertion of multiple helices.

关键词： cell membrane amphiphilic helix membrane deformation molecular simulation

Learning to select pseudo labels: a semi-supervisedmethod for named entity recognition

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Frontiers of Information Technology & Electronic Engineering 2020年第6期21卷 903-916页

作者： zhen-zhen li Da-wei FENG Dong-sheng li Xi-cheng LU College of Computer National University of Defense TechnologyChangsha 410073China

Deep learning models have achieved state-of-the-art performance in named entity recognition(NER);the good performance,however,relies heavily on substantial amounts of labeled *** some specific areas such as medical,financial,and military domains,labeled data is very scarce,while unlabeled data is readily *** studies have used unlabeled data to enrich word representations,but a large amount of entity information in unlabeled data is neglected,which may be beneficial to the NER *** this study,we propose a semi-supervised method for NER tasks,which learns to create high-quality labeled data by applying a pre-trained module to filter out erroneous pseudo *** labels are automatically generated for unlabeled data and used as if they were true *** semi-supervised framework includes three steps:constructing an optimal single neural model for a specific NER task,learning a module that evaluates pseudo labels,and creating new labeled data and improving the NER model *** results on two English NER tasks and one Chinese clinical NER task demonstrate that our method further improves the performance of the best single neural *** when we use only pre-trained static word embeddings and do not rely on any external knowledge,our method achieves comparable performance to those state-of-the-art models on the CoNLL-2003 and OntoNotes 5.0 English NER tasks.

关键词： Named entity recognition Unlabeled data Deep learning Semi-supervised method

Double-layered TiO_(2) cavity/nanoparticle photoelectrodes for efficient dye-sensitized solar cells

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Frontiers of Materials Science 2023年第1期17卷 153-161页

作者： zhen li libo Yu College of Chemistry and Chemical Engineering Hexi UniversityZhangye 734000China Key Laboratory of Hexi Corridor Resources Utilization of Gansu Hexi UniversityZhangye 734000China

TiO_(2) nanoparticles(NPs)in the size of-25 nm,namely P25,are very common material as the electron collecting layer in dye-sensitized solar cells(DSsCs).However,the light-scattering improvement of TiO2 NP photoelectrodes is stll a ***,we built TiO2 cavities on the top of the TiO2 NP layer by using carbonaceous microspheres as the template,forming the TiO_(2) cavity/nanoparticle(C/NP)photoelectrode for the application in *** cavity amount in the TiO_(2) C/NP photoelectrode was controlled by adjusting the weight ratio of carbonaceous *** results confirm the successful formation of the double-layered TiO_(2) C/NP electrode.J-V tests show that the optimized TiO_(2) C/NP electrode prepared with 25 wt.%carbonaceous microspheres contributes to remarkable improvement of the short-circuit current density(Jsc)and the power conversion efficiency(PcE).The best photovoltaic performance solar cell with the PCE of 9.08%is achieved with the optimized TiO_(2) C/NP photoelectrode,which is over 98% higher than that of the TiO_(2) NP *** investigations of UV-vis DRS,IPCE,OCVD,and EIS demonstrate that the competition between light scattering effect and charges recombination in this TiO_(2) C/NP photoelectrode is responsiblefor the PCE enhancement.

关键词： titanium dioxide dye sensitized solar cell cavity light scattering

High-efficiency dielectric capacitors based on BaTi_(0.5)Hf_(0.5)O_(3) films

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Rare Metals 2023年第8期42卷 2545-2551页

作者： Yan lin Fei li zhen li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Electronic Materials Research Lab Key Lab of Education Ministry and State Key Laboratory for Mechanical Behavior of MaterialsSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China

Film dielectric capacitors enabled with large breakdown field strength and high energy density play a key role for compact and integrated power ***,the energy storage efficiency is always sacrificed as we tried to increase the energy *** trade-off between energy density and efficiency means significant energy dissipation and thermal effects,which will lead to a deterioration ofthe reliability and lifetime of the dielectric capacitors.

关键词： dielectric lifetime energy