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Highly bright and low turn-on voltage CsPbBr3 quantum dot LEDs via conjugation molecular ligand exchange

Nano Research 2019年第1期12卷 109-114页

作者： Guopeng Li Jingsheng Huang Yanqing Li Jianxin Tang Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Institute of Functional Nano&Soft Materials(FUNSOM) Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215123China

All-inorganic CsPbBr3 perovskite quantum dots (QDs) hold great promise as candidate materials for next-generation electroluminescent displays owing to their excellent optoelectronic properties.However,the long insulating ligands on the surface of CsPbBr3 QDs originating from the synthesis process hinder the fabrication of high-performance optoelectronic devices.Herein,an efficient ligand-exchange route is proposed with the use of perovskite-precursor-based halide ligands,including a series of phenalkylammonium bromides with a π-conjugation benzene ring and different branch lengths.Based on the ligand-exchange method,the conductivity of the CsPbBr3 QD layer is significantly improved owing to ligand shortening and the insertion of the π-conjugation benzene ring.As a result,high brightness (up to 12,650 cd/m2)and low tum-on voltage (as low as 2.66 V) can be realized in CsPbBr3 QD light-emitting diodes (QLEDs),leading to dramatic improvements in device performance with a current efficiency of 13.43 cd/A,power efficiency of 12.05 lm/W,and external quantum efficiency of 4.33%.

关键词： CsPbBr3 quantum dots perovskite light-emitting diodes ligand exchange π-conjugation

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Synthesis and Molecular Structures of Two Novel π-conjugation Extended Dithia[3.3]metacyclophanes

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Crystal Structure Theory and Applications 2017年第1期6卷 1-10页

作者： Tetsuji Moriguchi Daisuke Yakeya Venkataprasad Jalli Akihiko Tsuge Kenji Yoza Department of Applied Chemistry Faculty of Engineering Kyushu Institute of Technology Kitakyushu Japan Bruker AXS Yokohama Japan

Two novel dithia[3.3]metacyclophanes substituted with ethynyl groups were synthesized as small-sized metacyclophanes from the corresponding brominated dithia-metacyclophanes via C-C bond formation reaction. These compounds were characterized by using 1H NMR, mass spectrometry and elemental analyses. The exact structures were determined by using X-ray diffraction analyses. X-ray diffraction analysis results revealed that these compounds have anti conformations because of existence of intermolecular π-π interaction and some short contacts in the crystal. The long wavelength fluorescence was observed for one of the compound having a pyrene moiety in solid state because of the existence of the intermolecular π-π interaction between two pyrene units.

关键词： Cyclophane X-Ray Analysis Suzuki Coupling π-conjugation

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Customizable 2D Covalent Organic Frameworks for Optoelec-tronic Applications

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Chinese Journal of Chemistry 2023年第10期41卷 1260-1285页

作者： Mingchao Shao Yunqi Liu Yunlong Guo Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

2D covalent organic framework(2D-COF),a modular three-dimensional material,is easily influenced by the component module.The assembly of different functionalized modules gives 2D-COF unique performance.The modular structure not only allows for customi-zation but also allows for variety,which gives 2D-COF a wide range of functions.Hence,many building blocks with catalytic,ligand,semiconductor,luminescent,and redox centers are integrated into the COF scaffold.The connection and assembly of such modules determine the nature of the final block material.The intra-layer connections of the modules form a monolayer mesh chemical structure,and the subsequent stacking of the monolayer mesh structure produces the final crystalline porous material-2D-COF.This review describes in detail the potential of COF materials as optoelectronic materials and our understanding of optoelectronic processes,starting from monolayer reticulation chemistry to final 3D stacked structures,thus establishing a new paradigm for the ra-tional design of well-defined novel 2D-COF optoelectronic materials and devices.

关键词： 2D covalent organic frameworks Optoelectronic π-conjugation Stacking Doping Charge transfer Organic electronics Donor-acceptor systems

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Synthesis of π-Conjugated Field Transferred Berberine-based Nitroimidaozles as Potential Antibacterial Agents

Synthesis of π-Conjugated Field Transferred Berberine-based...

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中国化学会第十四届全国有机合成化学学术研讨会

作者： Guo-Biao Zhang Vijai Kumar Reddy Tangadanchu Cheng-He Zhou Institute of Bioorganic ＆ Medicinal Chemistry School of Chemistry and Chemical EngineeringSouthwest University

A series of berberine-derived nitroimidazoles as novel antibacterial agents were designed, synthesized and characterized by NMR, IR, and HRMS spectra. The antibacterial evaluation showed that compound 7h exerted 13-fold more potent activity against MRSA strains than clinical norfloxacin. The active molecule 7h was further cultured and confirmed by X-ray diffraction analysis.

关键词： berberine nitroimidaozle π-conjugation antibacterial

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