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Highly Efficient Electroluminescent Materials with High Color Purity Based on Strong Acceptor Attachment onto B-N-Containing Multiple Resonance Frameworks

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CCS Chemistry 2022年第6期4卷 2065-2079页

作者： Yincai Xu Chenglong Li Zhiqiang Li Jiaxuan Wang Jianan Xue Qingyang Wang Xinliang Cai Yue Wang State Key laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012 Jihua Laboratory Foshan 528200Guangdong Province

The development and enrichment of organic materials with narrowband emission in longer wavelength regions beyond 515 nm still remains a great challenge.Herein,a synthetic methodology for narrowband emission materials has been proposed to functionalize multiple resonance(MR)skeletons and generate a universal building block,namely,the key intermediate DtCzB-Bpin,which can be utilized to construct multifarious thermally activated delayed fluorescence(TADF)materials with high color purity through a simple one-step Suzuki coupling reaction.Based on this unique synthetic strategy,a series of efficient narrowband green TADF emitters has been constructed by localized attachment of 1,3,5-triazine and pyrimidine derivatives-based acceptors onto B–N-containing MR frameworks with 1,3-bis(3,6-di-tertbutylcarbazol-9-yl)benzene(DtCz)as the ligand.The precise modulation of the acceptor is an intelligent approach to achieve bathochromic shift and narrowband emission simultaneously.The DtCzB-TPTRZbased organic light-emitting diode(OLED)exhibits pure green emission with Commission Internationale de L’Eclairage(CIE)coordinates of(0.23,0.68),a maximum external quantum efficiency(EQE)of 30.6%,and relatively low efficiency roll-off.

关键词： organic light-emitting diode multiple resonance narrowband emission high color purity thermally activated delayed fluorescence

Study on preparation and ns-laser damage of HfO2 single layers

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Study on preparation and ns-laser damage of HfO2 single laye...

Laser powder bed fusion of NiTiFe shape memory alloy via premixed powder: microstructural evolution, mechanical and functional properties

第四届粤港澳大湾区真空科技创新发展论坛暨2020年广东...

作者：郭可升 Lang Hu Hong Wei Chitengfei Zhang Long Yao Qiang Hu Ping Xu laboratory of Microwave and Vacuum Technology Jihua Laboratory

The effects of the main parameters of argon flux,oxygen flux and beam voltage on the surface morphology,transmittance spectrum and laser damage of the HfO single layers prepared by ion beam sputtering are studied.The HfO amorphous single layers have porous surface morphologies.Different processes will cause differences in coatings absorption and surface morphology,which in turn will cause changes in the spectral transmittance curve.The ion beam sputtering HfO single layers have high content of argon(4.5%～8%).The laser damage of HfO single layers is related to argon inclusions and non-stoichiometric defects.The changes of argon flux and beam voltage have a greater impact on argon content and O/Hf ratio.When the argon content in the coatings is lower and the O/Hf ratio is higher,the laser damage thresholds of the HfO single layers are higher.

关键词： HfO2 single layers argon flux laser damage optical coatings

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Rare Metals 2024年第5期43卷 2300-2316页

作者： Bo Yuan Jin-Guo Ge Liang Zhang Hong-Jun Chen Long-Sha Wei Yu-Duo Zhou Run-Hua Song Institute of Intelligent Manufacturing Technology Shenzhen Polytechnic School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guangdong Advanced Polymer Composite EngineeringTechnology Research Center Shenzhen Academy of Aerospace Technology Jihua Laboratory Testing Center Jihua Laboratory

High-cost pre-alloyed powder is the bottleneck problem that limits the widespread application of additivemanufactured shape memory alloys. In this work, the lowcost ternary NiTiFe shape memory alloy is fabricated by laser powder bed fusion (LPBF) technique via mechanically mixed pre-alloy NiTi powder and varying contents pure Fe powder (1, 2, 3 wt%). All NiTiFe alloys show a relative density of up to 99.8%by optimizing the LPBF processing parameters. Owing to the heterogeneous nucleation effect of micron-sized Fe particles, both grain refinement and texture weakening are generated in the NiTiFe alloys, accompanied by the reduction of dislocation density. For the room-temperature mechanical properties,the NiTi-3Fe alloy shows the highest microhardness of HV370, but the fracture strength and elongation reduce to1701 MPa and 23%simultaneously. The evolution of mechanical properties is attributed to the high internal defects, low dislocation density and the incoherent oxide.Moreover, the NiTi-3Fe alloy shows the quasi-linear superelasticity behavior; the superelastic recoverable strain of NiTi-1Fe and NiTi-2Fe decreased with the increase in Fe content. This study provided a new-fangled insight for the development of multi-component NiTi-based shape memory alloys by additive manufacturing.

关键词： Additive manufacturing Shape memory alloy Metal matrix composite Microstructure Mechanical properties

Evolution of Quasicrystals and Long-Period Stacking Ordered Structures During Severe Plastic Deformation and Mixing of Dissimilar Mg Alloys Upon Friction Stir Welding

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 12-24页

作者： Meichen Liang Hao Zhang Lifeng Zhang Peng Xue Dingrui Ni Weizhen Wang Zongyi Ma Hengqiang Ye Zhiqing Yang Shenyang National laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesSchool of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Jihua Laboratory Foshan 528251China

Microstructural evolution during severe plastic deformation and mixing of Mg95.8Zn3.6Gd0.6 and Mg97Cu1Y2(at%)alloys upon friction stir welding was studied.A laminated onion-ring structure composed of alternative distribution of layers with signifi cantly refi ned microstructures from diff erent alloys was formed in the stirred zone.Coarse quasicrystals were broken up and dispersed with most of them being transformed into cubic W-phase particles,and thick 18R long-period stacking ordered plates were fractured and transformed into fi ne 14H-LPSO lamellae in the stirred zone(SZ)experiencing complex material flow under high strain rate.Fine W-phase particles and 14H-LPSO lamellae formed during dissimilar friction stir welding(FSW)usually have no specifi c orientation relationship with surrounding Mg matrix.Chemical measurements demonstrated occurrence of interdiff usion between dissimilar layers in the SZ.Phase transformation was observed for some particles of quasicrystals and long-period stacking ordered(LPSO)in regions slightly outside the SZ.An ultimate tensile strength of~415 MPa and an elongation to failure of~27.8%,both exceeding those of base materials,were obtained in the SZ,due to microstructural refi nement and formation of a laminated structure.

关键词： Mg alloy Microstructure Phase transformation Severe plastic deformation Mechanical property

An unusual substitution reaction of an aromatic sulfonic group based on 3-carbonyl-4-phenolsulfonic acid

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Chinese Chemical Letters 2013年第7期24卷 613-616页

作者： Yun-Ming Wang Bing-Tao Tang Wei Ma Shu-Fen Zhang De-Feng Zhao State Key laboratory of Fine Chemicals Dalian University of Technology(West Campus) jihua Group Co. Ltd.

An unusual substitution reaction of an aromatic sulfonic group based on 3-carbonyl-4-phenolsulfonic acid was discovered in a diazo-coupling process. The reaction occurred under mild reaction conditions （pH 8.0-9.0, 0-5 ℃, solvent： water） within a short reaction time （1 h）. A plausible substitution reaction mechanism by phenol-ketone resonance was proposed.

关键词： Aromatic sulfonic groups Substitution reaction Diazo-coupling Diazonium salt

Strong interface contact between NaYF_(4):Yb,Er and CdS promoting photocatalytic hydrogen evolution of NaYF_(4):Yb,Er/CdS composites

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Journal of Materials Science & Technology 2022年第7期102卷 1-1,2-7页

作者： Huaze Zhu Yongqiang Yang Yuyang Kang Ping Niu Xiangdong Kang Zhiqing Yang Hengqiang Ye Gang Liu Shenyang National laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110819China Jihua Laboratory Foshan 528000China

To acquire efficient photocatalysts,it is necessary to make effective use of visible light/Near Infrared(NIR)light,which takes up a large percentage of sunlight.Integrating upconversion materials with visible light active photocatalysts has attracted much attention in this regard.The interface contact between upcon-version material and photocatalyst has potential influence on the properties and thus the performance of the system.In this work,NaYF_(4):Yb,Er/CdS composites of the upconversion material NaYF_(4):Yb,Er nanorods and CdS nanoparticles were synthesized by ion adsorption/precipitation process and were then annealed in an argon atmosphere at different temperatures to modulate the microstructures.The annealing pro-cess endows the crystal transformation of cubic CdS with low crystallinity to hexagonal CdS with high crystallinity and,importantly,good interface contact between NaYF_(4):Yb,Er and CdS.Consequently,the hy-drogen evolution activity greatly increases from 171 to 2539μmol h^(−1) g^(−1) under the light irradiation ofλ>400 nm,and from 0 to 19μmol h^(−1) g^(−1) under the light irradiation ofλ>600 nm.This work might provide a useful reference for the rational design of promising photocatalyst involving upconversion ma-terials.

关键词： NaYF_(4):Yb Er CdS Upconversion Photocatalytic Composite

A sandwich-like structure hybrid coating of cold galvanizing coating/polydopamine on hot-dip galvanized steel with enhanced adhesion and corrosion resistance

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Science China(Technological Sciences) 2023年第8期66卷 2381-2395页

作者： LI JiWen GAO NingJie ZHANG WanYu XU Long NWOKOLO Kenneth Izuchukwu WU Hao LIU FuChun HAN En-Hou Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Corrosion Science and Technology Guangzhou 510530China Jihua Laboratory Foshan Guangdong ProvinceFoshan 528000China

This study aims to enhance the adhesion strength and anti-corrosion performance of the cold galvanizing coating(CGC)applied on the hot-dip galvanized steel(HDG).Polydopamine(PDA)is deposited on the HDG surface with different time ranges and as an interlayer between CGC and HDG through covalent immobilization.The surface morphology and the covalent interaction between PDA/HDG are exhibited by scanning electron microscope(SEM),atomic force microscopy(AFM)and X-ray photoelectron spectroscopy(XPS).The pull-off adhesion tests before and after neutral slat spry tests show an enhanced dry adhesion strength and less adhesion loss of the hybrid CGC/PDA coated HDG compared with the direct CGC coated HDG.In addition,open circuit potential(OCP)reveals that the corrosion protection performance of the hybrid CGC/PDA coated HDG increases by 200%(up to 201 d)and the corrosion density icorrattaining about 4.45×10^(-7)A/cm^(2).Electrochemical impedance spectroscopy(EIS)measurements and X-ray diffraction(XRD)analysis confirm that the precipitate of the stable chelation formed by PDA and Zn^(2+)between CGC and HDG substrate can also improve the corrosion protection performance.Such a strategy of strengthening adhesion and forming the chelate compound at the HDG surface promises a new route to corrosion protection of CGC on HDG.

关键词： dopamine zinc-rich coatings hot-dip galvanized steel corrosion protection chelate compound

A Protocol for Digitalized Collection of Traditional Chinese Medicine(TCM)Pulse Information Using Bionic Pulse Diagnosis Equipment

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Phenomics

Phenomics 2023年第5期3卷 519-534页

作者： Xing Zhu Fanyu Wang Jian Mao Yulin Huang Peng Zhou Jingjing Luo Institute of AI and Robotics Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Jihua Laboratory FoshanGuangdong 528200China School of Precision Instrument and Optoelectronic Engineering Tianjin UniversityTianjin 300072China

Pulse diagnosis equipment used in Traditional Chinese Medicine(TCM)has long been developed for collecting pulse information and in TCM research.However,it is still difficult to implement pulse taking automatically or efficiently in clinical practice.Here,we present a digital protocol for TCM pulse information collection based on bionic pulse diagnosis equipment,which ensures high efficiency,reliability and data integrity of pulse diagnosis information.A four-degree-of-freedom pulse taking platform together with a wrist bracket can satisfy the spatial positioning and angle requirements for individually adaptive pulse acquisition.Three-dimensional reconstruction of a wrist surface and an image localization model are combined to provide coordinates of the acquisition position and detection direction automatically.Three series elastic joints can not only simulate the TCM pulse taking method that“Three fingers in a straight line,the middle finger determining the‘Guan’location and finger pulp pressing on the radial artery,”but also simultaneously carry out the force-controlled multi-gradient pressing process.In terms of pulse information integrity,this proposed protocol can generate rich pulse information,including basic individual information,pulse localization distribution,multi-gradient dynamic pulse force time series,and objective pulse parameters,which can help establish the fundamental data sets that are required as the pulse phenotype for subsequent comprehensive analysis of pulse diagnosis.The implementation of this scheme is beneficial to promote the standardization of the digitalized collection of pulse information,the effectiveness of detecting abnormal health status,and the promotion of the fundamental and clinical research of TCM,such as TCM pulse phenomics.

关键词： Traditional Chinese Medicine pulse information Digitalized pulse taking process Bionic pulse diagnosis equipment Automatic visual localization Multi-gradient pre-pressure Pulse phenotype

Atomic-resolution studies on reactions between basal dislocations and {1012} coherent twin boundaries in a Mg alloy

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Journal of Materials Science & Technology 2021年第7期66卷 28-35页

作者： Huhu Su Xinzhe Zhou Shijian Zheng Hengqiang Ye Zhiqing Yang Shenyang National laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesSchool of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang110016China State Key laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin300130China Jihua Laboratory Foshan528251China

Reactions between basal 〈a60〉 dislocations and {1012} coherent twin boundaries(CTBs) in a Mg alloy were studied with atomic resolution. Individual dislocation-CTB reactions produced steps with residual dislocations and multiple t winnin g dislocations(TDs) gliding away, consequently resulting in TB migration. Reactions between {1012} CTBs and low-angle grain boundaries composed of basal 〈a60〉 dislocations created either basal-prismatic/prismatic-basal interfaces or asymmetric tilt grain boundaries, depending on whether TDs gliding away or not. Not only the emission of TDs by dislocation-TB reactions may drive TB migration, but also the resultant steps or facets along TBs can act as TD sources to facilitate TB migration. Our results indicate that roughness or severe loss of local coherency induced by dislocation-TB reactions does not intrinsically impede TB migration in Mg alloys. Dislocation-TB reactions may provide another feasible strategy to improve the ductility of Mg alloys, in addition to other techniques like grain refinement and texture modification.

关键词： Mg alloys Dislocation Twin boundary Migration Plastic deformation