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arXiv 2020年

作者： Feng, Hai L. Ghimire, Madhav Prasad Hu, Zhiwei Liao, Sheng-Chieh Agrestini, Stefano Chen, Jie Yuan, Yahua Matsushita, Yoshitaka Tsujimoto, Yoshihiro Katsuya, Yoshio Tanaka, Masahiko Lin, Hong-Ji Chen, Chien-Te Weng, Shih-Chang Valvidares, Manuel Chen, Kai Baudelet, Francois Tanaka, Arata Greenblatt, Martha Tjeng, Liu Hao Yamaura, Kazunari Research Center for Functional Material National Institute for Materials Science 1-1 Namiki TsukubaIbaraki305-0044 Japan Max Planck Institute for Chemical Physics of Solids Nöthnitzer Str. 40 Dresden01187 Germany Department of Chemistry and Chemical Biology Rutgers State University of New Jersey 610 Taylor Road PiscatawayNJ08854 United States Central Department of Physics Tribhuvan University Kirtipur Kathmandu44613 Nepal Leibniz Institute for Solid State and Materials Research IFW Dresden P.O. Box 270116 DresdenD-01171 Germany Condensed Matter Physics Research Center Butwal-11 Rupandehi Nepal ALBA Synchrotron Light Source E-08290 Cerdanyola del Vall`es Barcelona Spain Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Hokkaido Sapporo060-0810 Japan School of Physics and Electronics Central South University Changsha410083 China Materials Analysis Station National Institute for Materials Science 1-2-1 Sengen Ibaraki Tsukuba305-0047 Japan SPring-8 National Institute for Materials Science Synchrotron X-ray Station Kouto 1-1-1 Hyogo Sayo-cho679-5148 Japan National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu30076 Taiwan Synchrotron SOLEIL L’Orme des Merisiers Saint-Aubin Gif-sur-Yvette Cedex91192 France Department of Quantum Matter ADSM Hiroshima University Higashi-Hiroshima739-8526 Japan Institute of Physics Chinese Academy of Sciences Beijing100190 China

Room-temperature ferrimagnetism was discovered for the anti-site-disordered perovskite Ca2MnOsO6 with Tc = 305 K. Ca2MnOsO6 crystallizes into an orthorhombic structure with a space group of Pnma, in which Mn and Os share the oxygen-coordinated-octahedral site at an equal ratio without a noticeable ordered arrangement. The material is electrically semiconducting with variable-range-hopping behavior. X-ray absorption spectroscopy confirmed the trivalent state of the Mn and the pentavalent state of the Os. X-ray magnetic circular dichroism spectroscopy reveals that the Mn and Os magnetic moments are aligned antiferromagnetically, thereby classifying the material as a ferrimagnet which is in accordance with band structure calculations. It is intriguing that the magnetic signal of the Os is very weak, and that the observed total magnetic moment is primarily due to the Mn. The Tc = 305 K is the second highest in the material category of so-called disordered ferromagnets such as CaRu1-xMnxO3, SrRu1-xCrxO3, and CaIr1-xMnxO3, and hence, may support the development of spintronic oxides with relaxed requirements concerning the anti-site disorder of the magnetic ions. Copyright © 2020, The Authors. All rights reserved.

关键词： Ferrimagnetism

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Particle trapping and beaming in a 3D nanotip excited with plasmonic vortex

arXiv

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arXiv 2019年

作者： Zhang, Xue Jin Shen, Yuefeng Liu, Kai Li, Xueyun Maccaferri, Nicolò Gorodetski, Yuri Garoli, Denis National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Physics and Materials Science Research Unit University of Luxembourg 162a avenue de la Faïencerie LuxembourgL-1511 Luxembourg Electrical Engineering and Electronics Department Mechanical Engineering and Mechatronics Department Ariel University Ariel40700 Israel Istituto Italiano di Tecnologia Via Morego 30 Genova16163 Italy

Recent advances in nanotechnologies have prompted the need for tools to accurately and non-invasively manipulate individual nano-objects. Among the possible strategies, optical forces have been widely used to enable nano-optical tweezers capable of trapping or moving a specimen with unprecedented accuracy. Here, we propose an architecture consisting of a nanotip excited with a plasmonic vortex enabling effective dynamical control of nanoparticles in three dimensions. The optical field generated by the structure can be used to manipulate single dielectric nanoparticles acting on the total angular momentum of light used to illuminate the structure. We demonstrate that it’s possible to stably trap or push the particle from specific points, thus enabling a new platform for nanoparticle manipulation and sorting. Copyright © 2019, The Authors. All rights reserved.

关键词： Vortex flow

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Protecting the Nanoscale Properties of Ag Nanowires with a Solution-Grown SnO2 Monolayer as Corrosion Inhibitor (vol 141, pg 13977, 2019)

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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 2019年第44期141卷 17950-17950页

作者： Zhao, Yang Wang, Xijun Yang, Shize Kuttner, Elisabeth Taylor, Aidan A. Salemmilani, Reza Liu, Xin Moskovits, Martin Wu, Binghui Dehestani, Ahmad Li, Jian-Feng Chisholm, Matthew F. Tian, Zhong-Qun Fan, Feng-Ru Jiang, Jun Stucky, Galen D. Department of Chemistry and Biochemistry University of California Santa Barbara Santa Barbara California 93106 United StatesState Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) CAS Center for Excellence in Nanoscience School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 P. R. China Center for Nanophase Materials Science Oak Ridge National Laboratory Oak Ridge Tennessee 37830 United States BASF SE Ludwigshafen am Rhein 67063 Germany Materials Department University of California Santa Barbara Santa Barbara California United States Department of Mechanical Engineering University of California Santa Barbara Santa Barbara California 93106 United States School of Resources and Materials Northeastern University at Qinhuangdao Qinhuangdao 066004 P. R. China Department of Chemistry and Biochemistry University of California Santa Barbara Santa Barbara California 93106 United States Department of Chemistry and Biochemistry University of California Santa Barbara Santa Barbara California 93106 United States California Research Alliance (CARA) BASF Corporation Berkeley California 94720-1460 United States State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China Center for Nanophase Materials Science Oak Ridge National Laboratory Oak Ridge Tennessee 37830 United States State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) College of Chemistry and Chemical Engineering Xiamen Uni

The chemical reactivity and/or the diffusion of Ag atoms or ions during thermal processing can cause irreversible structural damage, hindering the application of Ag nanowires (NWs) in transparent conducting films and other applications that make use of the material’s nanoscale properties. Here, we describe a simple and effective method for growing monolayer SnO₂ on the surface of Ag nanowires under ambient conditions, which protects the Ag nanowires from chemical and structural damage. Our results show that Sn²⁺ and Ag atoms undergo a redox reaction in the presence of water. First-principle simulations suggest a reasonable mechanism for SnO₂ formation, showing that the interfacial polarization of the silver by the SnO₂ can significantly reduce the affinity of Ag to O₂, thereby greatly reducing the oxidation of the silver. The corresponding values (for example, before coating: 17.2 Ω/sq at 86.4%, after coating: 19.0 Ω/sq at 86.6%) show that the deposition of monolayer SnO₂ enables the preservation of high transparency and conductivity of Ag. In sharp contrast to the large-scale degradation of pure Ag-NW films including the significant reduction of its electrical conductivity when subjected to a series of harsh corrosion environments, monolayer SnO₂ coated Ag-NW films survive structurally and retain their electrical conductivity. Consequently, the thermal, electrical, and chemical stability properties we report here, and the simplicity of the technology used to achieve them, are among the very best reported for transparent conductor materials to date.

关键词： Monolayers

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Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor

arXiv

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arXiv 2020年

作者： Qi, Ji Dong, Baojuan Zhang, Zhe Zhang, Zhao Chen, Yanna Zhang, Qiang Danilkin, Sergey Chen, Xi Fu, Liangwei Jiang, Xiaoming Chai, Guozhi Hiroi, Satoshi Ohara, Koji Zhang, Zongteng Ren, Weijun Yang, Teng Zhou, Jianshi Osami, Sakata He, Jiaqing Yu, Dehong Li, Bing Zhang, Zhidong Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China 1-1-1 Kouto Sayo-Cho Sayo-gun Hyogo679-5148 Japan Spallation Neutron Source Oak Ridge National Laboratory Oak RidgeTN37831 United States Australian Nuclear Science and Technology Organisation Locked Bag 2001 Australia Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Department of Physics South University of Science and Technology of China Shenzhen518005 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences FuzhouFujian350002 China Key Lab for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University Lanzhou730000 China SPring-8 Diffraction and Scattering Division Japan Synchrotron Radiation Research Institute 1-1-1 Kouto Sayo-Cho Sayo-gun Hyogo679-5198 Japan State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China

A solid with larger sound speeds exhibits higher lattice thermal conductivity (lat) 1-3. Diamond4 is a prominent instance where its mean sound speed is 14400 m s-1 and lat is 2300 W m-1 K-1. Here, we report an extreme exception that CuP2 has quite large mean sound speeds of 4155 m s-1, comparable to GaAs5,6, but the single crystals show a very low lattice thermal conductivity of about 4 W m-1 K-1 at room temperature, one order of magnitude smaller than GaAs. To understand such a puzzling thermal transport behavior, we have thoroughly investigated the atomic structure and lattice dynamics by combining neutron scattering techniques with first-principles simulations. Cu atoms form dimers sandwiched in between the layered P atomic networks and the dimers vibrate as a rattling mode with frequency around 11 meV. This mode is manifested to be remarkably anharmonic and strongly scatters acoustic phonons to achieve the low lat. Such a dimer rattling behavior in layered structures might offer an unprecedented strategy for suppressing thermal conduction without involving atomic disorder. Copyright © 2020, The Authors. All rights reserved.

关键词： III-V semiconductors

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Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation

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Advanced materials 2020年第44期132卷 19618-19627页

作者： Sun, Qiming Wang, Ning Fan, Qiyuan Zeng, Lei Mayoral, Alvaro Miao, Shu Yang, Ruoou Jiang, Zheng Zhou, Wei Zhang, Jichao Zhang, Tianjun Xu, Jun Zhang, Peng Cheng, Jun Yang, Dong-Chun Jia, Ran Li, Lin Zhang, Qinghong Wang, Ye Terasaki, Osamu Yu, Jihong State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun130012 China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Co. Ltd. Beijing100080 China Shanghai Synchrotron Radiation Facility Zhangjiang National Lab Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Wuhan Center for Magnetic Resonance State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan430071 China Department of Chemistry Dalhousie University Halifax NSB3H 4R2 Canada Institute of Theoretical Chemistry Jilin University Changchun130023 China International Center of Future Science Jilin University Qianjin Street 2699 Changchun130012 China Electron Microscopy Center Jilin University Changchun130012 China

Propane dehydrogenation (PDH) has great potential to meet the increasing global demand for propylene, but the widely used Pt-based catalysts usually suffer from short-term stability and unsatisfactory propylene selectivity. Herein, we develop a ligand-protected direct hydrogen reduction method for encapsulating subnanometer bimetallic Pt–Zn clusters inside silicalite-1 (S-1) zeolite. The introduction of Zn species significantly improved the stability of the Pt clusters and gave a superhigh propylene selectivity of 99.3% with a weight hourly space velocity (WHSV) of 3.6–54 h−1 and specific activity of propylene formation of 65.5 molC3H6 gPt−1h−1 (WHSV=108 h−1) at 550°C. Moreover, no obvious deactivation was observed over PtZn4@S-1-H catalyst even after 13000 min on stream (WHSV=3.6 h−1), affording an extremely low deactivation constant of 0.001 h−1, which is 200 times lower than that of the PtZn4/Al2O3 counterpart under the same conditions. We also show that the introduction of Cs+ ions into the zeolite can improve the regeneration stability of catalysts, and the catalytic activity kept unchanged after four continuous cycles. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Zeolites

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Magnetoelastic distortion of multiferroic BiFeO3 in the canted antiferromagnetic state

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Physical Review B 2020年第21期102卷 214410-214410页

作者： T. Rõõm J. Viirok L. Peedu U. Nagel D. G. Farkas D. Szaller V. Kocsis S. Bordács I. Kézsmárki D. L. Kamenskyi H. Engelkamp M. Ozerov D. Smirnov J. Krzystek K. Thirunavukkuarasu Y. Ozaki Y. Tomioka T. Ito T. Datta R. S. Fishman National Institute of Chemical Physics and Biophysics Akadeemia tee 23 12618 Tallinn Estonia Department of Physics Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group 1111 Budapest Hungary Condensed Matter Research Group of the Hungarian Academy of Sciences 1111 Budapest Hungary Institute of Solid State Physics Vienna University of Technology 1040 Vienna Austria RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Hungarian Academy of Sciences Premium Postdoctor Program 1051 Budapest Hungary Experimental Physics V Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg 86159 Augsburg Germany High Field Magnet Laboratory (HFML-EMFL) Radboud University Toernooiveld 7 6525 ED Nijmegen Netherlands National High Magnetic Field Laboratory Tallahassee FloridA 32310 USA Department of Physics Florida A&M University Florida 32307 USA National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8565 Ibaraki Japan Department of Chemistry and Physics Augusta University 1120 15th Street Augusta Georgia 30912 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA

Using THz spectroscopy, we show that the spin-wave spectrum of multiferroic BiFeO3 in its high-field canted antiferromagnetic state is well described by a spin model that violates rhombohedral symmetry. We demonstrate that the monoclinic distortion of the canted antiferromagnetic state is induced by the single-ion magnetoelastic coupling between the lattice and the two nearly antiparallel spins. The revised spin model for BiFeO3 contains two new single-ion anisotropy terms that violate rhombohedral symmetry and depend on the direction of the magnetic field.

关键词： Ferroelectricity Magnetic anisotropy Magnetic order Magnetoelastic effect Spin dynamics Spin waves Spin-orbit coupling Ferroelectrics Multiferroics Terahertz spectroscopy

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Squeezing Néel-type magnetic modulations by Enhanced Dzyaloshinskii-Moriya interaction of 4d electrons

arXiv

引用

arXiv 2019年

作者： Butykai, Ádám Geirhos, Korbinian Szaller, Dávid Kiss, László F. Balogh, László Azhar, Maria Garst, Markus DeBeer-Schmitt, Lisa Waki, Takeshi Tabata, Yoshikazu Nakamura, Hiroyuki Kézsmárki, István Bordács, Sándor Department of Physics Budapest University of Technology and Economics Budapest1111 Hungary Condensed Matter Research Group of the Hungarian Academy of Sciences Budapest1111 Hungary Experimental Physics V Center for Electronic Correlations and Magnetism University of Augsburg Augsburg86135 Germany Institute of Solid State Physics TU Wien Vienna1040 Austria Department of Experimental Solid State Physics Institute for Solid State Physics and Optics Wigner Research Centre for Physics Budapest1121 Hungary Institut für Theoretische Festkörperphysik Karlsruhe Institute of Technology Karlsruhe76131 Germany Institute for Quantum Materials and Technology Karlsruhe Institute of Technology Karlsruhe76131 Germany Neutron Scattering Division ORNL Oak RidgeTN37831 United States Department of Materials Science and Engineering Kyoto University Kyoto606-8501 Japan Hungarian Academy of Sciences Premium Postdoctor Program Budapest1051 Hungary

In polar magnets, such as GaV4S8, GaV4Se8 and VOSe2O5, modulated magnetic phases namely the cycloidal and the Néel-type skyrmion lattice states were identified over extended temperature ranges, even down to zero Kelvin. Our combined small-angle neutron scattering and magnetization study shows the robustness of the Néel-type magnetic modulations also against magnetic fields up to 2 T in the polar GaMo4S8. In addition to the large upper critical field, enhanced spin-orbit coupling produces a variety of modulated phases with sub-10 nm periodicity and a peculiar distribution of the magnetic modulation vectors. Thus, our work demonstrates that non-centrosymmetric magnets with 4d and 5d electron systems are ideal candidates to host highly compressed magnetic spirals and skyrmions. Copyright © 2019, The Authors. All rights reserved.

关键词： Gallium compounds

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High-Quality and Strain-Relaxation GaN Epilayer Grown on SiC Substrates Using AIN Buffer and AlGaN Interlayer

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Chinese Physics Letters 2017年第4期34卷 108-111页

作者： Bo-Ting Liu Shi-Kuan Guo Ping Ma Jun-Xi Wang Jin-Min Li Semiconductor Lighting R&D Center Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049 State Key Laboratory of Solid State Lighting Beijing 100083 Beijing Engineering Research Center for the Third-Generation Semiconductor Materials and Application Beijing 100083

We study the effect of the AlGaN interlayer on structural quality and strain engineering of the GaN films grown on SiC substrates with an AlN buffer layer, hnproved structural quality and tensile stress releasing are realized in unintentionally doped GaN thin films grown on 6H-SiC substrates by metal organic chemical vapor deposition. Using the optimized AlGaN interlayer, we find that the full width at half maximum of x-ray diffraction peaks for GaN decreases dramatically, indicating an improved crystalline quality. Meanwhile, it is revealed that the biaxial tensile stress in the GaN film is significantly reduced from the Raman results. Photoluminescence spectra exhibit a shift of the peak position of the near-band-edge emission, as well as the integrated intensity ratio variation of the near-band-edge emission to the yellow luminescence band. Thus by optimizing the AlGaN interlayer, we could acquire the high-quality and strain-relaxation GaN epilayer with large thickness on SiC substrates.

关键词： AlGaN In High-Quality and Strain-Relaxation GaN Epilayer Grown on SiC Substrates Using AIN Buffer and AlGaN Interlayer SiC AIN

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Influence of Al Preflow Time on Surface Morphology and Quality of AlN and GaN on Si(111) Grown by MOCVD

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Chinese Physics Letters 2017年第5期34卷 119-123页

作者：刘波亭马平李喜林王军喜李晋闽 Semiconductor Lighting R&D Center Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049 State Key Laboratory of Solid State Lighting Beijing 100083 Beijing Engineering Research Center for the Third-Generation Semiconductor Materials and Application Beijing 100083

We investigate the influence of A1 preflow time on surface morphology and quality of AIN and GaN. The AIN and GaN layers are grown on a Si （111） substrate by metal organic chemical vapor deposition. Scanning electron microscopy, atomic force microscopy, x-ray diffraction and optical microscopy are used for analysis. Consequently, we find significant differences in the epitaxial properties of AlN buffer and the GaN layer, which are dependent on the AI preflow time. A1 preflow layers act as nucleation sites in the case of AiN growth. Compact and uniform AIN nucleation sites are observed with optimizing A1 preflow at an early nucleation stage, which will lead to a smooth AIN surface. Trenches and AlN grain clusters appear on the AIN surface while meltoback etching occurs on the GaN surface with excessive A1 preflow. The GaN quality variation keeps a similar trend with the AIN quality, which is influenced by AI preflow. With an optimized duration orAl preflow, crystal quality and surface morphology of AIN and GaN could be improved.

关键词： GaN AlN AIN Grown by MOCVD Influence of Al Preflow Time on Surface Morphology and Quality of AlN and GaN on Si Si

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Pure aromatic hydrocarbons with meta-linked phenyl-core and perihedral fluorene substitutions with/without inert groups of tert-butyl： bipolar hosts for blue phosphorescence

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science China Chemistry 2017年第2期60卷 223-230页

作者： Gaowen Liu Chuanjun Wang Baoxiu Mi Minjie Zhuo Changjin Ou Jie Wang Shuchao Zheng Juan Song Zhiqiang Gao Dapeng Cao Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) Nanjing University of Posts & Telecommunications Nanjing 210023 China. School of Material Science and Engineering Jiangsu Engineering Centre for Flat-Panel Displays & Solid-state Lighting Nanjing University of Posts &Telecommunications Nanjing 210023 China

Two pure hydrocarbon molecules of l,3,5-tris(9-phenyl-9H-fluoren-9-yl)benzene(mTPFB)and l,3,5-tris(2-tert-butyl-9-phenyl-9H-fluoren-9-yl)benzene(tBu-mTPFB)were *** to the conjugation blocked connection mode and rigid/bulky substitutions,these two materials possess high triplet energy,enabling them as good hosts for blue phosphor in *** studying their thermal,electrochemical,electronic absorption and photoluminescent properties,it was found that the influence of the inert tert-butyl group on material photoelectrical properties is *** instance,mTPFB and tBu-mTPFB showed very similar absorption and emission profiles,with almost the same bandgap,triplet energy and energy ***,the encapsulation of tert-butyl on the 2-position of 9-phenylfluorene enhanced material thermal *** importantly,carrier transport properties were improved dramatically,as proved by the mono carrier *** phosphorescent OLEDs hosted by tBu-mTPFB showed external quantum efficiency of 15.2%and current efficiency of 23.0 cd/A,which were much higher than that of the OLEDs based on mTPFB with the analogous structure.

关键词： pure aromatic hydrocarbon bipolar host thermal stability carrier transport properties tert-butyl moiety

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