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Color-tunable circularly polarized electroluminescence from a helical chiral multiple resonance emitter with B–N bonds

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Science China Chemistry 2023年第9期66卷 2612-2620页

作者： Li Yuan Zhen-Long Tu Jun-Wei Xu hua-xiu ni Zhi-Ping Mao Wen-Ye Xu You-Xuan Zheng State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Shenzhen Institute of Information Technology Shenzhen 518172China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Guangzhou Research&Creativity Biotechnology Co.Ltd. Guangzhou 510700China

Chiral B,N-doped polycyclic aromatic hydrocarbons with circularly polarized luminescence(CPL) and small full-width at halfmaxima(FWHM) are promising multiple resonance(MR) emitters for CP organic light-emitting diodes(CP-OLEDs).This work presents a pair of chiral MR enantiomers,P/M-o[B-N]_(2)N_(2),featuring B–N bonds incorporated within a[7]-helicene *** enantiomers exhibit narrow 0-0 and 0-1 electronic transition bands,whose relative intensity can be fine-tuned by increasing doping concentrations,resulting in redshifts of the emission peak from 542 to 592 *** enantiomers show mirrorsymmetric CPL spectra with an asymmetry factor(|g_(PL)|) of 1.0×10^(-3).The hyperfluorescent CP-OLEDs with double-sensitized emitting layers display a FWHM of 33 nm,an external quantum efficiency of 25.1%,and a|g_(EL)|factor of 7.7×10^(-4).Notably,the CP-OLEDs realize color-tunable CP electroluminescence peak from 553 to 613 nm by regulating the vibrational *** work provides a novel concept for the design of helical CP-MR materials and CP-OLEDs,highlighting their potential for future applications in advanced optoelectronic devices.

关键词： chiral multiple resonance material helical chirality circularly polarized luminescence narrowband emission color-tunable circularly polarized electroluminescence

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One-shot synthesis of heavy-atom-modified carbazole-fused multi-resonance thermally activated delayed fluorescence materials

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Science China Materials 2024年第9期67卷 2789-2795页

作者： Jia-Jun Hu Jia-Qi Liang Zhi-Ping Yan hua-xiu ni Xiang-Ji Liao You-Xuan Zheng State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou450001China

Efficient multi-resonance thermally activated delayed fluorescence(MR-TADF)materials hold significant potential for applications in organic light-emitting diodes(OLEDs)and ultra-high-definition ***,the stringent synthesis conditions and low yields typically associated with these materials pose substantial challenges for their practical *** this study,we introduce an innovative strategy that involves peripheral modification with sulfur and selenium atoms for two materials,CFDBNS and *** approach enables a directed one-shot borylation process,achieving synthesis yields of 66%and 25%,respectively,while also enhancing reverse intersystem crossing *** emitters exhibit ultra-narrowband sky-blue emissions centered around 474 nm,with full width at half maximum(FWHM)values as narrow as 19 nm in dilute toluene solutions,along with high photoluminescence quantum yields of 98%and 99%in doped films,*** OLEDs based on CFDBNS and CFDBNSe display sky-blue emissions with peaks at 476 and 477 nm and exceptionally slender FWHM values of 23 ***,the devices demonstrate remarkable performances,achieving maximum external quantum efficiencies of 24.1%and 27.2%.This work presents a novel and straightforward approach for the incorporation of heavy atoms,facilitating the rapid construction of efficient MR-TADF materials for OLEDs.

关键词： one-shot synthesis multi-resonance thermally activated delayed fluorescence carbazole-fused dual-boron embedded framework ultra-narrowband emission organic light-emitting diode

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DESIGN OF A CROSS-SHAPED PIEZOELECTRIC MOTOR WITH SINGLE DRIVING FOOT

DESIGN OF A CROSS-SHAPED PIEZOELECTRIC MOTOR WITH SINGLE DRI...

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2015全国压电和声波理论及器件技术研讨会

作者： Jun-kao LIU Dong-mei XU Ying-xiang LIU xiu-hua ni Wei-shan CHEN State Key Laboratory of Robotics and System Harbin Institute of Technology Shanghai Radio Equipment Research Institute

A cross-shaped piezoelectric motor with length of 43mm and diameter of 11 mm was proposed in this *** third bending modes were used to generate ellipse trajectory at the driving foot located at the vibrator’s *** pieces of piezoelectric ceramic plates with sizes of 5mmx3mmx lmm were used to excite two third bending *** and cosine voltages with effective value of 100V at the frequency of 54.696 kHz were applied to the piezoelectric ceramic plates in right and left sides of the *** structure of the motor solved the problem of mode frequency *** excitation methods were put forward to excite two third bending *** effectiveness of the two excitation methods was compared by the transient analysis with finite element *** analysis results showed that motion trajectories of nodes on the driving feet were three-dimensional and that ellipse motion in the XOY plane was fit to drive the motor,and the new excitation method improves the vibration amplitude in the OX and OY by 2 times and 4 times,respectively compared with the vibration amplitude excited by the traditional excitation method.

关键词： Cross-shaped beam Piezoelectric motor Third bending Vibrations Vibration characteristic

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WORKING PRINCIPLE AND DESIGN OF A LINEAR ULTRASOniC MOTOR WITH RING-TYPE STATOR

WORKING PRINCIPLE AND DESIGN OF A LINEAR ULTRASONIC MOTOR WI...

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2015全国压电和声波理论及器件技术研讨会

作者： Ji-peng YAN Ying-xiang LIU Sheng-jun SHI xiu-hua ni huai-yin XIONG State Key Laboratory of Robotics and System Harbin Institute of Technology Shanghai Radio Equipment Research Institute

This paper presents a new idea for constructing ring-type linear ultrasonic *** stator of proposed motor contains two driving feet,sixteen pieces of piezoelectric ceramic plates and three rings-inner ring,middle ring and outer *** proposed ultrasonic motor forms elliptical movements on the driving feet by the superposition of stretching and bending vibration of the metal *** paper presents the working principle of proposed *** using FEM method,the proposed motor is designed and *** adjusting the structure parameters,the resonance frequencies of two working modes were tuned to be *** by transient analysis,the elliptical motion trajectories of nodes on the driving feet are obtained and verify the theoretical feasibility.

关键词： Ultrasonic motor Linear driving Ring-type Axial bending mode Radial stretching mode

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ANALYSIS OF A NOVEL LONGITUDINAL-BENDING HYBRID ULTRASOniC MOTOR USING VIBRATION COUPLING

ANALYSIS OF A NOVEL LONGITUDINAL-BENDING HYBRID ULTRASONIC M...

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2015全国压电和声波理论及器件技术研讨会

作者： Ying-xiang LIU Chun-hong LI Wei-shan CHEN xiu-hua ni Jun-kao LIU State Key Laboratory of Robotics and System Harbin Institute of Technology Shanghai Radio Equipment Research Institute

A novel longitudinal-bending（L-B）hybrid ultrasonic motor using vibration coupling is *** with the previous L-B ultrasonic motors,only longitudinal PZT plates are used;and the longitudinal-bending hybrid vibrations of the motor are excited *** boundary condition is applied on one side surface of the flange,which locates at the wave node of a longitudinal *** working principle of the motor is *** using finite element method,comparison between the proposed ultrasonic motor with fixed boundary condition and a transducer with free boundary condition are developed by modal analysis,harmonic analysis and transient *** is found that the longitudinal-bending hybrid vibrations can be produced by the longitudinal piezoelectric elements under a fixed boundary condition of the *** should be noted that the bending vibration is not generated by the bending piezoelectric elements,but excited by a vibration coupling effect under an unsymmetrical boundary *** change of the boundary condition also shows minute effects on the resonance frequency and the electromechanical coupling *** elliptical movements are formed on the two end tips of the *** motions can push the runners linearly by frictional forces if preloads are applied.

关键词： Ultrasonic motor Longitudinal vibration Bending vibration Vibration coupling Boundary condition

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DESIGN OF A BENDING VIBRATIONS HYBRID TYPE ULTRASOniC MOTOR WITH A BONDED-TYPE STRUCTURE

DESIGN OF A BENDING VIBRATIONS HYBRID TYPE ULTRASONIC MOTOR ...

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2015全国压电和声波理论及器件技术研讨会

作者： Ying-xiang LIU Dong-mei XU Ji-peng YAN xiu-hua ni Wei-shan CHEN State Key Laboratory of Robotics and System Harbin Institute of Technology Shanghai Radio Equipment Research Institute

A bending vibrations hybrid type ultrasonic motor with a bonded-type structure is proposed and designed in this *** pieces of PZT plates are bonded on a metal beam to form the proposed *** this design,elliptical movements of the driving feet,the significant motion to realize the actuating of a rotor,is produced by the superimposing of two first bending vibrations orthogonal in *** structural parameters’ sensitivities of the bending resonance frequency and the electromechanical coupling factor are calculated and discussed by modal analysis and harmonic analysis *** most sensitive parameters are ***,the vibration characteristic of the proposed motor is mvestigated by transient analysis;another ultrasonic motor with the same length but no horns is also calculated to give a *** with previous motor,the proposed one drive the runner by two transversal displacements of the driving tip;this new actuating mode has merits of higher resonance frequency,larger vibration amplitude and velocity,better movement trajectory uniformity and shorter response *** study results can guide the fabrication of linear or rotary ultrasonic motor with small size.

关键词： Ultrasonic motor Bending vibration Bonded-type Parameter sensitivity Actuating mode

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Grid-Connected/Islanded Switching Control Strategy for Photovoltaic Storage Hybrid Inverters Based on Modified Chimpanzee Optimization Algorithm

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Energy Engineering 2025年第1期122卷 265-284页

作者： Chao Zhou NarisuWang Fuyin ni Wenchao Zhang School of Electrical and Information Engineering Jiangsu University of TechnologyChangzhou213001China Jiangsu Key Laboratory of Power Transmission&Distribution Equipment Technology Jiangsu University of TechnologyChangzhou213001China

Uneven power distribution,transient voltage,and frequency deviations are observed in the photovoltaic storage hybrid inverter during the switching between grid-connected and island *** response to these issues,this paper proposes a grid-connected/island switching control strategy for photovoltaic storage hybrid inverters based on the modified chimpanzee optimization *** proposed strategy incorporates coupling compensation and power differentiation elements based on the traditional droop ***,it combines the angular frequency and voltage amplitude adjustments provided by the phase-locked loop-free pre-synchronization control *** pre-synchronization is achieved by regulating the virtual current to zero and aligning the photovoltaic storage hybrid inverter with the grid ***,two novel operators,learning and emotional behaviors are introduced to enhance the optimization precision of the chimpanzee *** operators ensure high-precision and high-reliability optimization of the droop control parameters for photovoltaic storage hybrid inverters.A Simulink model was constructed for simulation analysis,which validated the optimized control strategy’s ability to evenly distribute power under load *** strategy effectively mitigated transient voltage and current surges during mode ***,seamless and efficient switching between gridconnected and island modes was achieved for the photovoltaic storage hybrid *** enhanced energy utilization efficiency,in turn,offers robust technical support for grid stability.

关键词： Photovoltaic storage hybrid inverters modified chimpanzee optimization algorithm droop control seamless switching

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Exosomes:the next-generation therapeutic platform for ischemic stroke

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Neural Regeneration Research 2025年第5期20卷 1221-1235页

作者： Wenjing Yin Hongyin Ma Yang Qu Jiaxin Ren Yingying Sun Zhen-ni Guo Yi Yang Stroke Center Department of NeurologyFirst Hospital of Jilin UniversityChangchunJilin ProvinceChina Neuroscience Research Center Department of NeurologyFirst Hospital of Jilin UniversityChangchunJilin ProvinceChina

Current therapeutic strategies for ischemic stroke fall short of the desired objective of neurological functional ***,there is an urgent need to develop new methods for the treatment of this *** are natural cell-derived vesicles that mediate signal transduction between cells under physiological and pathological *** have low immunogenicity,good stability,high delivery efficiency,and the ability to cross the blood–brain *** physiological properties of exosomes have the potential to lead to new breakthroughs in the treatment of ischemic *** rapid development of nanotechnology has advanced the application of engineered exosomes,which can effectively improve targeting ability,enhance therapeutic efficacy,and minimize the dosages *** in technology have also driven clinical translational research on *** this review,we describe the therapeutic effects of exosomes and their positive roles in current treatment strategies for ischemic stroke,including their antiinflammation,anti-apoptosis,autophagy-regulation,angiogenesis,neurogenesis,and glial scar formation reduction ***,it is worth noting that,despite their significant therapeutic potential,there remains a dearth of standardized characterization methods and efficient isolation techniques capable of producing highly purified *** optimization strategies should prioritize the exploration of suitable isolation techniques and the establishment of unified workflows to effectively harness exosomes for diagnostic or therapeutic applications in ischemic ***,our review aims to summarize our understanding of exosome-based treatment prospects in ischemic stroke and foster innovative ideas for the development of exosome-based therapies.

关键词： blood–brain barrier electroacupuncture engineering exercise exosomes ischemic stroke mesenchymal stem cells microglia neuroprotection stents

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Magnetron sputtered nickel oxide with suppressed interfacial defect states for efficient inverted perovskite solar cells

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Journal of Energy Chemistry 2025年第1期100卷 348-355页

作者： Guoqiang Ma Qin Tan Zhaoning Li Jingwei xiu Jiafeng Wang Tianle Cheng Dong He Qiang Sun Xuhang Ma Francesco Lamberti Zhubing He Department of Materials Science and Engineering Institute of Innovative Materials (I2M) Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG)Southern University of Science and Technology (SUSTech) Core Research Facilities Southern University of Science and Technology Department of Chemical Sciences Department of Industrial Engineering University of Padova

Widely used spin-coated nickle oxide （niOx） based perovskite solar cells often suffer from severe interfacial reactions between the niOxand adjacent perovskite layers due to surface defect states,which inherently impair device performance in a long-term view,even with surface molecule *** this study,we developed high-quality magnetron-sputtered niOxthin films through detailed process optimization,and compared systematically sputtered and spin-coated niOxthin film surfaces from materials to *** sputtered niOxfilms exhibit improved crystallinity,smoother surfaces,and significantly reduced ni3+or ni vacancies compared to their spin-coated ***,the interface between the perovskite and sputtered niOxfilm shows a substantially reduced density of defect *** solar cells （PSCs） fabricated with our optimally sputtered niOxfilms achieved a high power conversion efficiency （PCE） of up to 19.93%and demonstrated enhanced stability,maintaining 86.2% efficiency during 500 h of maximum power point tracking under one standard sun ***,with the surface modification using (4-(2,7-dibromo-9,9-dimethylacridin-10（9H）-yl)butyl)p hosphonic acid （DMAcPA）,the device PCE was further promoted to 23.07%,which is the highest value reported for sputtered niOxbased PSCs so far.

关键词： Perovskite

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Output Feedback H~∞ Control for a Class of Nonlinear Stochastic Systems

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Acta Mathematicae Applicatae Sinica 2010年第2期26卷 251-266页

作者： Yuan-hua ni Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and SystemsScience Chinese Academy of Sciences Beijing 100190 China

This paper deals with the output feedback H∞ control problem for a class of nonlinear stochastic systems. Based on the latest developed theory of stochastic dissipation, a notable result about the nonlinear H∞ output feedback control of deterministic system is generalized to the stochastic case. Finally, in the cases of state feedback and output feedback, two families of controllers are provided respectively.

关键词： H∞ control stochastic nonlinear systems Hamilton-Jacobi-Isaacs equations output feedback

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