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Chiral electron transporting material for circularly polarized organic light-emitting diode

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Science china chemistry 2024年第11期67卷 3777-3784页

作者： Peihao Huo Tianyu Yang Peiyu Fang yujia Li Nanlong Zheng Min Gong Zuqiang Bian Zhiwei liu beijing national {2. for molecular sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular Engineering Peking University

Circularly polarized organic light-emitting diode(CP-OLED) has attracted increasing interest for its efficient ability to generate circularly polarized light directly. So far, many CP-OLEDs were successfully fabricated with chiral emitters or chiral hosts. In this study, a new strategy based on chiral electron transporting layer is proposed to construct CP-OLEDs. A pair of chiral electron transporting materials, 1,3,5-tris((R/S)-4-isopropyl-4,5-dihydrooxazol-2.yl)benzene((R/S)-TOxiPr), are firstly designed and synthesized. The crystalline films of(R/S)-TOxiPr show circularly polarized photoluminescence with photoluminescence dissymmetry factors of-0.067 and +0.041, respectively. The CP-OLEDs based on(R/S)-TOxiPr and three types of achiral emitters all exhibit circularly polarized electroluminescence, showing feasibility and strong versatility of this new strategy. The mechanism is attributed to in-situ electrical excitation instead of simply light filtering of non-circularly polarized light. This work demonstrates a new approach for realizing circularly polarized electroluminescence which may provide a valuable strategy to develop CP-OLEDs.

关键词： circularly polarized organic light-emitting diodes chiral electron transporting layer trisoxazolinylbenzene circularly polarized electroluminescence

Highly efficient through-space charge transfer TADF molecule employed in TADF-and TADF-sensitized organic light-emitting diodes

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Science china chemistry 2024年第4期67卷 1270-1276页

作者： Jiasen Zhang Deli Li Wei Li yujie Wu Xilin Mu Chunyu {2. Kaibo Fang Ziyi Ge Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State key laboratory of Luminescent Materials and Devices and {2. of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhou 510640China

The inception and harnessing of excitons are paramount for the electroluminescence performance of organic light-emitting devices(OLEDs).Through-space charge transfer(TSCT)via intramolecular interaction has proved to be one of the most potent techniques employed to achieve 100% internal quantum ***,molecular strategies utilized to comprehensively enhance the electroluminescent performance of TSCT emitters regarding improving the photoluminescence quantum yield(PLQY)and elevating the light out-coupling efficiency remain *** surmount this challenge,we deliberately designed and synthesized a proof-of-concept TSCT emitter called CzO-TRZ by incorporating an extra carbazole donor into spiroheterocyclic *** introduction of rigid spiral fragments can immensely boost the horizontal orientation dipole ratio and establish an extra through-bond charge transfer(TBCT)radiative decay *** a result,a very high PLQY of 98.7%,fast kRISCof 2.2.10^(5)s^(-1)and high k_(r)^(s) of 2.2.10^(7)s^(-1),and an ultrahigh horizontal dipolar ratio of 90%were concurrently achieved for Cz O-TRZ blended ***,corresponding thermally activated delayed fluorescence(TADF)-and TADF-sensitized fluorescence(TSF)-OLEDs based on CzO-TRZ demonstrated external quantum efficiencies(EQEs)of 33.4% and 30.3%,respectively,highlighting its versatile applications as both an emitter and sensitized host.

关键词： organic electronics organic light-emitting diodes polycyclic aromatic hydrocarbons multiple-resonance

A structurally ordered thiophene-thiazole copolymer for organic thin-film transistors

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Science china chemistry 2012年第5期55卷 760-765页

作者： CHEN DuGang ZHAO Yan ZHONG Cheng yu gui {2. yunqi QIN Jingui Department of chemistry and Hubei key Lab on {2. and Polymeric Optoelectronic Materials Wuhan UniversityWuhan 430072China beijing national {2. for molecular sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

This paper reports a new donor-acceptor copolymer semiconductor, PTBTh, comprising bithiophene and bithiazole where the regular coplanar structure and the intramolecular charge transfer are expected to increase the opportunity for --- stacking and charge transport. The AFM image shows lamellar stacking of the polymer on the surface. The field-effect transistor (FET) properties of PTBTh have been evaluated by a bottom-contact/bottom-gate TFT configuration. The device showed a high hole mobility of 1.14×10-2.cm2.V-1 s-1 and a current on/off ratio of 3×105 with the polymer thin film annealed at a mild temperature of 12. ℃ when measured under ambient conditions.

关键词： thin-film transistors copolymer mobility atomic force microscopy

Manganese-Catalyzed Regioselective Hydroboration of Quinolines via Metal-Ligand Cooperation

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CCS chemistry 2024年第6期6卷 1535-1546页

作者： yujie Wang Hengxu Li Haobo Yang Mingjie Fan Qiang liu Center of Basic molecular Science(CBMS) Department of ChemistryTsinghua UniversityBeijing 100084

Selective reduction of readily available N-heteroarenes is important in both organic synthesis and chemical ***,we describe ligand-controlled regiodivergent hydroboration of quinolines using well-defined amido-manganese catalysts,with an emphasis on the rarely reported 1,*** studies showed that 1,2.hydroboration of quinoline was kinetically favorable and reversible,whereas 1,4-hydroboration was under thermodynamic *** a 1-methyimidazolebased pincer amido-manganese complex as the catalyst,cooperative C-H…N andπ…πnoncovalent interactions between the 1-methyimidazole moiety and quinoline substrates enabled kinetic accessibility of 1,4-hydroboration,giving thermodynamically favored 1,4-hydroborated quinolines as the major *** this basis,Mn-catalyzed 1,4-hydroboration of a series of substituted quinolines proceeded smoothly in high yields.A high turnover number of 2.00 was achieved in this reaction with satisfying *** transformation could be further applied to the C3-selective functionalization of quinolines,highlighting the synthetic utility of this *** contrast,using a pyridine-based pincer amido-manganese complex as the catalyst,which lacked the C-H…N interaction,the free-energy barrier for 1,4-hydroboration significantly increased through a N-B…N interaction between the“HMn-NB”species and quinoline,resulting in the kinetically favored 1,2.hydroboration product with excellent regioselectivity.

关键词： catalytic hydroboration N-heteroarenes regioselectivity manganese catalysis metal-ligand cooperation

Synthesis, structure, optoelectronic properties of novel zinc Schiff-base complexes

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chinese Science Bulletin 2013年第22期58卷 2733-2740页

作者： WANG LiPing JIAO ShiBo ZHANG WeiFeng liu yunqi {2. gui School of Material Science and Engineering University of Science and Technology Beijing beijing national {2. for molecular sciences Institute of ChemistryChinese Academy of Sciences

Two novel zinc Schiff-base complexes, bis-(N-(2.hydroxybenzidene)-p-aminodimethylaniline)zinc(II) (2. and bis-(N-(2.hydroxy-1-naphthidene)-p-aminodimethylaniline)zinc(II) (4) were designed and synthesized. Both the complexes exhibit good solubility in organic solvents and excellent thermal stabilities. A single crystal of 2.was grown and its crystalline structure was determined from X-ray diffraction data. Analysis of the electronic structures of both the zinc complexes calculated by density functional theory reveals a localization of orbital. The UV-Vis absorption and photoluminescence profiles of 4 in thin film are similar to those of 2. but the emission for 4 is red-shifted compared to 2. Three-layered devices with a configuration of ITO/NPB/2.Alq 3 /LiF/Al and ITO/NPB/4/Alq 3 /LiF/Al show a yellow and red emission, respectively.

关键词：锌络合物晶体结构光电特性合成希夫碱席夫碱络合物密度泛函计算 UV-Vis

Porous framework materials for energy&environment relevant applications:A systematic review

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Green Energy & Environment 2024年第2期9卷 217-310页

作者： yutao liu Liyu Chen Lifeng Yang Tianhao Lan Hui Wang Chenghong Hu Xue Han Qixing liu Jianfa Chen Zeming Feng Xili Cui Qianrong Fang Hailong Wang Libo Li yingwei Li Huabin Xing Sihai Yang Dan Zhao Jinping Li College of Chemical Engineering and Technology Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan030024China School of chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China key laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China Department of chemistry The University of ManchesterManchesterM139PLUK Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou311215China State key laboratory of In{2. Synthesis and Preparative chemistry Jilin UniversityChangchun130012China beijing key {2. for Science and Application of Functional molecular and Crystalline Materials Department of ChemistryUniversity of Science and Technology BeijingBeijing100083China

Carbon peaking and carbon neutralization trigger a technical revolution in energy&environment related *** of new technologies for green energy production and storage,industrial energy saving and efficiency reinforcement,carbon capture,and pollutant gas treatment is in highly imperious *** emerging porous framework materials such as metal–organic frameworks(MOFs),covalent organic frameworks(COFs)and hydrogen-bonded organic frameworks(HOFs),owing to the permanent porosity,tremendous specific surface area,designable structure and customizable functionality,have shown great potential in major energy-consuming industrial processes,including sustainable energy gas catalytic conversion,energy-efficient industrial gas separation and ***,this manuscript presents a systematic review of porous framework materials for global and comprehensive energy&environment related applications,from a macroscopic and application perspective.

关键词： Porous framework materials Catalysis Separation Gas storage Carbon neutrality

Production of Graphene Nanospheres by Annealing of Graphene Oxide in Solution

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Nano Research 2011年第7期4卷 705-711页

作者： Jian Zheng Hongtao liu Bin Wu yunlong Guo Ti Wu {2. yu yunqi liu Daoben Zhu beijing national {2. for molecular sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Graduate University of chinese academy of sciences Beijing 100039 China

We report a simple method to produce graphene nanospheres （GNSs） by annealing graphene oxide （GO） solution at high-temperature with the assistance of sparks induced by the microwave absorption of graphite flakes dispersed in the solution. The GNSs were formed by rolling up of the annealed GO, and the diameters were mostly in the range 300-700 nm. The GNS exhibited a hollow sphere structure surrounded by graphene walls with a basal spacing of 0.34 nm. Raman spectroscopy and X-ray photoelectron spectroscopy of the GNSs confirmed that the GO was efficiently reduced during the fabrication process. The resulting GNSs may open up new opportunities both for fundamental research and applications, and this method may be extended to the synthesis of other nanomaterials and the fabrication of related nanostructures.

关键词： Graphene nanosphere self-assembly microwave anneal

On-Surface Synthesis of Electron-Deficient Bisanthene Tetraimide

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CCS chemistry 2024年第3期6卷 672-681页

作者： Ye liu Liangliang Chen Hailong Li Xi-Sha Zhang Qigang Zhong Zhengming Hao Minghui Wu Yan-ying Huang Lina Wang Minchong Sheng Miao Xie Haiming Zhang Deqing Zhang Lifeng Chi Jiangsu key laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsu 215123 CAS key laboratory for {2. solids Institute of ChemistryChinese Academy of SciencesBeijing 100190 institute of Applied Physics Justus Liebig University GiessenGiessen 35392

Imide-based conjugated molecules have emerged as a highly promising class of building blocks for constructing n-type semiconducting materials with lowlying lowest unoccupied molecular orbitals and exceptional *** imides,such as naphthalene diimides,perylene diimides and their lateral fused analogs,have been synthesized extensively,the design and synthesis of largerπ-extended molecules incorporating more than two imide groups are desirable but still very ***,we report the synthesis of an unprecedented electron-deficient bisanthene tetraimide(ATI)containing a bisantheneconjugated core and four five-membered imide groups,which was successfully achieved via a combined approach of solution and on-surface *** chemical structures,electronic states,formation mechanism and aromaticity of ATI were systematically investigated by scanning tunneling microscopy,noncontact atomic force microscopy,scanning tunneling spectroscopy,and density functional theory calculations.

关键词： on-surface synthesis electron-deficient bisanthene tetraimide dehydrocyclization low lowest unoccupied molecular orbital level

局部晚期头颈部鳞状细胞癌新辅助免疫治疗研究进展

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中华耳鼻咽喉头颈外科杂志 2024年第2期59卷 187-191页

作者：宋艺璇桂琳刘绍严国家癌症中心、国家肿瘤临床医学研究中心、中国医学科学院北京协和医学院肿瘤医院头颈外科北京100021 国家癌症中心、国家肿瘤临床医学研究中心、中国医学科学院北京协和医学院肿瘤医院肿瘤内科北京100021

局部晚期头颈部鳞状细胞癌(head and neck squamous cell carcinoma,HNSCC)是临床治疗的难点,传统的治疗方式包含手术、放疗和化疗在内的多模式治疗,但治疗疗效有限。近期开展的临床研究将免疫检查点抑制剂应用于局部晚期HNSCC的新辅助... 详细信息

局部晚期头颈部鳞状细胞癌(head and neck squamous cell carcinoma,HNSCC)是临床治疗的难点,传统的治疗方式包含手术、放疗和化疗在内的多模式治疗,但治疗疗效有限。近期开展的临床研究将免疫检查点抑制剂应用于局部晚期HNSCC的新辅助治疗中,以期提高治疗疗效并增加挽救手术的有效性。但目前新辅助免疫治疗的疗效尚不明确,临床试验仍在不断探索。本文旨在综述新辅助免疫治疗在局部晚期HNSCC患者中的研究进展,对局部晚期HNSCC患者的治疗提供参考。

关键词：新辅助治疗头颈部鳞状细胞癌免疫检查点抑制剂免疫治疗临床试验局部晚期治疗疗效 carcinoma