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Chemical Research in Chinese Universities 2024年第4期40卷 657-663页

作者： ZHU Lixun LIU Dan WU Kaiwen xie guohua ZHAO Zheng TANG Ben Zhong School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen518172P.R.China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyHongkong999077P.R.China The Institute of Flexible Electronics(Future Technologies) Xiamen UniversityXiamen361005P.R.China

Developing easily accessible deep-red/near-infrared circularly polarized emitters for practical organic light-emitting diodes remains a significant ***,a practical strategy has been proposed for developing deep-red circularly polarized delayed fluorescent emitters based on a novel chiral acceptor *** changing triphenylamine(TPA)substitution position from para to meta,R/S-M-TBBTCN demonstrated thermally activated delayed fluorescence(TADF)properties with a delayed lifetime of 6.6µs that R/S-P-TBBTCN doesn’t ***,R/S-M-TBBTCN showed a 65 nm red-shift in emission and a 10-fold enhancement in asymmetry factor(glum),compared with R/*** solution-processed nondoped circularly polarized organic light-emitting diodes(CP-OLEDs)based on R-M-TBBTCN display deep-red emission and 2.2%external quantum efficiency.

关键词： Amplified chirality Deep-red circularly polarized organic light emitting-diode Binaphthol based chiral acceptor

A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes

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Science China Chemistry 2024年

作者： Jian-Gong Yang Xingyu Feng guohua xie Nengquan Li Jiayu Li Xiu-Fang Song Ming-De Li Jingling Zhang Xiaoyong Chang Kai Li Shenzhen Key Laboratory of New Information Display and Storage Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing Department of Chemistry and Chemical EngineeringWuhan Textile University The Institute of Flexible Electronics (Future Technologies) Xiamen University Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Department of ChemistryShantou University Department of Chemistry Southern University of Science and Technology

The efficient harvesting of triplet excitons is crucial to the realization of high-performance organic light-emitting diodes（OLEDs）.Herein,we show that coordination of donor-acceptor （D-A） type molecules to a metal atom in a monodentate fashion can lead to thermally activated delayed fluorescence （TADF） emissions with wide color tunability only through varying the noncoordinating acceptor moiety.A panel of TADF gold（I） complexes with emission maxima (λmax) of 545–645 nm from metal perturbed intraligand charge-transfer （MPICT） excited states have been *** effects of heavy atom-induced spin-orbit coupling （SOC）,steric-induced donor-acceptor twisting and suppressed intramolecular motions lead to high emission efficiencies of 65%?85% in doped films with delayed fluorescence lifetime of as short as 2.0μ*** absorption spectroscopic studies on selected complexes determined the kISCto be 6.5×10～*** calculations confirmed the participation of minor d orbital into the lowest excited state,which led to an SOC value of 5.19 cm-1between the lowest-lying singlet and triplet excited *** yellow to deep red solution-processed OLEDs based on the new gold（I） complexes incorporated with various D-A ligands demonstrated promising *** study validates a modular design for TADF metal complexes,which will broaden the choices of metal centers and allow for facile color tuning via simple ligand synthesis.

关键词：

基于四配位铂配合物敏化多重共振热激活延迟荧光的窄发射蓝色溶液加工有机发光二极管

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发光学报 2024年第5期45卷 699-710页

作者：李家乐方辉龚少龙谢国华武汉大学化学与分子科学学院索维奇分子科学中心湖北武汉430072 厦门大学柔性电子(未来技术)研究院福建厦门361005

有机发光二极管(OLED)已经在智能手机方面获得了商业应用,由于目前规模生产的OLED采用蒸镀工艺,使其价格居高不下。为此,我们采用溶液加工方法,使用铂配合物作为敏化剂,多重共振热激活延迟荧光材料作为发光分子,实现了高效、高色纯度、... 详细信息

有机发光二极管(OLED)已经在智能手机方面获得了商业应用,由于目前规模生产的OLED采用蒸镀工艺,使其价格居高不下。为此,我们采用溶液加工方法,使用铂配合物作为敏化剂,多重共振热激活延迟荧光材料作为发光分子,实现了高效、高色纯度、低效率滚降的器件开发。磷光敏化剂的引入可使三线态激子高效转化为单线态激子。得益于磷光敏化剂较短的激子寿命,基于溶液加工的蓝色多重共振热激活延迟荧光器件不仅实现了13.2%的外量子效率,而且在1000 cd/m^(2)亮度下的效率滚降仅为25.8%。为了进一步抑制Dexter能量转移,我们采用具有外围位阻但发光核相同的分子作为客体,可使外量子效率提升至13.6%,并抑制光谱展宽。该研究为设计高色纯度、高效率的溶液加工器件提供了一个通用的策略。

关键词：磷光敏化窄光谱多重共振热激活延迟荧光有机发光二极管

Thermally activated delayed fluorescent small molecule sensitized fluorescent polymers with reduced concentration-quenching for efficient electroluminescence

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Frontiers of Optoelectronics 2023年第1期16卷 47-54页

作者： Qin Xue Mingfang Huo guohua xie Department of Physical Science and Technology Central China Normal University Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of Chemistry Wuhan University Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

Thermally activated delayed fluorescence(TADF) small molecule bis-[3-(9,9-dimethyl-9,10-dihydroacridine)-phenyl]-sulfone(m-ACSO2) was used as a universal host to sensitize three conventional fluorescent polymers for maximizing the electroluminescent performance. The excitons were utilized via inter-molecular energy transfer and the non-radiative decays were successfully refrained in the condensed states. Therefore, the significant enhancement of the electroluminescent efficiencies was demonstrated. For instance, after doping poly(9,9-dioctylfluorene-co-benzothiadiazole)(F8BT) into m-ACSO2, the external quantum efficiency(EQE) was improved by a factor of 17.0 in the solution-processed organic light-emitting device(OLED), as compared with the device with neat F8BT. In terms of the other well-known fluorescent polymers, i.e., poly(para-phenylene vinylene) copolymer(Super Yellow, SY) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene](MEH-PPV), their EQEs in the devices were respectively enhanced by 70% and 270%, compared with the reference devices based on the conventional host 1,3-di(9H-carbazol-9-yl) benzene(mCP). Besides the improved charge balance in the bipolar TADF host, these were partially ascribed to reduced fluorescence quenching in the mixed films.

关键词： Thermally activated delayed fluorescence (TADF) Organic light-emitting device (OLED) Sensitization Energy transfer Solution process

Triplet manipulation for strong luminescence

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Science Bulletin 2020年第21期65卷 1780-1782页

作者： guohua xie Liming Ding Sauvage Center for Molecular Sciences Hubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan 430072China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

The excitons in organic semiconductors undergo either radiative or non-radiative decay after *** the singlets in the fluorescence counterparts,the triplets in the heavy-metal based phosphorescent emitter,thermally activated delayed fluorescence emitter with a small singlet-triplet gap,and metal-free room-temperature phosphorescence emitter with strong spinorbital coupling,respectively,could be feasibly harvested for photon generation, which are responsible for the theoretical 100% internal quantum efficiency.

关键词： excitation. radiative efficiency.

A novel method for the synthesis of carbon dots assisted by free radicals

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Nano Research 2022年第10期15卷 9470-9478页

作者： Xinyue Zhou Kebing Yi Yeling Yang guohua xie Xinghu Ji Zhike He College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan 430072China

Carbon dots(CDs)have gradually become a widely favored type of fluorescent nanomaterials with unlimited and promising *** work reports a means of breaking the shackle of method to develop new red and white CDs by introducing free *** resulting white emissive CDs in this strategy are employed to demonstrate electroluminescent white-light-emitting diodes(WLEDs)and achieve a record-high external quantum efficiency(0.95%)of one-step-produced white CDs(WCD)-LEDs,which dramatically simplifies the whole fabrication processes of *** additional passivation treatment,the red CDs(RCD2)with excellent properties such as N and S co-doping,bright(quantum yield=49%)and stable photoluminescence(PL),large positive zeta potential(+20.5 mV),and two-photon fluorescence are *** RCD2 are used for rapid staining(5 min)of yeast *** two CDs synthesized via this method have outstanding performance in different aspects,which provides new promise of CDs for further functionalization and applications.

关键词： carbon dots electroluminescent white-light-emitting diodes(LED) two-photon rapid cell staining synthesis method

New perylene diimide derivatives: stable red emission, adjustable property from ACQ to AIE, and good device performance with an EQE value of 4.93%

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Science Bulletin 2018年第2期63卷 108-116页

作者： Luyi Zong Yanbin Gong Yun Yu Yujun xie guohua xie Qian Peng Qianqian Li Zhen Li Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Wuhan University Wuhan 430072 China Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Perylene diimide （PDI） derivatives, due to their special opto-electronic property, have been successfully utilized in organic field-effect transistor （OFET）, solar cells, and as non-fullerene acceptor and others, while few cases in organic light-emitting diodes （OLEDs）. In this work, six perylene bisimide-based red emitters, N＇N＇-bis（2-decyltetradecyl）-1-（[1,1′：3′,1″-terphenyl]-5′-yl）perylene-3,4,9,10-diimide （STPH）, N＇N＇-bis（2-decyltetradecyl）-1,7-bis（[1,1′：3′,1″-terphenyl]-5′-yl）perylene-3,4,9,10-diimide （DTPH）, N,N＇- bis（2-decyltetradecyl）-1-（5′-phenyl-[1,1′：3′,1″-terphenyl]-4-yl）perylene-3,4,9,10-diimide （STRPH）, N,N′- bis（2-decyltetradecyl）-1,7-bis（5′-phenyl-[ 1 ,1′：3′,1＂-terphenyll-4-yl）perylene-3,4,9,10-diimide （DTRPH）, N,N′-bis（2-decyltetradecyl）-1-（4-（2,2-diphenylvinyl）phenyl）perylene-3,4,9,10-diimide/STTPE） and N,N＇- bis（2-decyltetradecyl）-1,7-bis（4-（2,2-diphenykvinyl）phenyl）perylene-3,4,9,10-diimide （DTTPE）, with the excellent chemical, thermal and photo-chemical stability, are synthesized through the convenient Suzuki coupling reaction, in which, the fluorescent properties can be modified easily from ACQ to AIE by just simply changing the bulky volume of the introduced aromatic substituents. After being fabricated into organic light-emitting diodes, STRPH exhibits the best performance with the maximum luminescence, power efficiency, current efficiency and external quantum efficiency of 1,948 cd m-2, 2.04lm W-1, 5.85 cd A-1, 4.93% at Commission Internationale de L＇Eclairage （CIE） coordinates of （0.56, 0.34）, as the result of the high efficient energy transfer and good energy match achieved in the device.

关键词： PDI derivativesRed emittersOrganic light-emitting diodesAggregation induced emission

Monoradically luminescent polymers by a super acid-catalyzed polymerization and deep-red electroluminescence

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Science China Chemistry 2020年第9期63卷 1214-1220页

作者： Kebin An guohua xie Shaolong Gong Zhanxiang Chen Xiang Zhou Fan Ni Chuluo Yang Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 430072China Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China

Luminescent radicals have received great attention recently due to their idiographic luminescent properties and potential 100%utilization efficiency of doublets under electrical ***,luminescent radical polymers are rarely explored owing to their challenging molecular design and ***,we report an efficient approach to construct luminescent radical polymers by a super acid-catalyzed polymerization reaction proceeded at room temperature,which intrinsically avoid the heavy metal *** obtained polymers exhibit the unique paramagnetic signals,good thermal properties,and excellent ***,the quantifiable electroluminescence of such radical polymers was demonstrated for the first time.

关键词： super acid-catalyzed polymerization doublets polymers electroluminescence organic light-emitting devices

Promise to electrically pumped colloidal quantum dot lasers

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The Innovation 2023年第5期4卷 17-18页

作者： Qiyin Chen Zhiling Qi Jie Lin Jingsong Huang guohua xie Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepantment of ChemistryWuhan UniversityWuhan 430072China The Istte of Flexible Electronics(Future Technologies) Xiamen UniversityXiamen 361005 China xford Suzhou Centre for Advanoed Research(OSCAR) University of OxfordSuzhou 215123China

The laser has been recognized as one of the most successful and significant technological achievements of the 20th ***,its applications are versatile,ranging from mundane tasks to cutting-edge scientific research,e.g.,displays,lighting,optical communications,remote sensing,and medical ***,it is believed that laser technology will continue to shape the world and change our way of *** all laser technologies,solution-processed colloidal quantum dot(CQD)laser diodes have attracted intensive attention due to their low cost,flexibility,simple processing,and ease of integration.

关键词： pumped quantum versatile

Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices

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Science China Chemistry 2020年第11期63卷 1645-1651页

作者： Huanhuan Li Jibiao Jin Yuan Xiang Ying Zhang Ye Tao Mingguang Li Qin Xue guohua xie Wei Huang Runfeng Chen Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&TelecommunicationsNanjing 210023China Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan 430072China Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Institute of Biomedical Materials and Engineering(SIBME)Northwestern Polytechnical University(NPU)Xi’an 710072China

The exploration of high-performance solution-processible host materials for blue and white electrophosphorescent devices is a key and fundamental challenge in the ongoing development of organic ***,two solution-processible resonance host materials with self-adaptive characteristics are delicately designed and *** of the dynamic tautomerization upon resonance variation,these smart hosts show self-adaptive and selectively enhanced charge carrier flux at high triplet energy *** by the resonance molecules,solution-processed blue and white devices exhibit excellent maximum current efficiencies(CEs)of 29.8 and 57.3 cd A−1,and external quantum efficiencies(EQEs)up to 14.5%and 23.5%,*** works highlight the significant progress of the solution-processed phosphorescent organic light-emitting diodes(PhOLEDs)using resonance host molecules,potentially furnishing a leap forward in constructing advanced organic semiconductors for next-generation optoelectronic devices.

关键词： solution-processed resonance hosts dynamic self-adaptation high-efficiency electrophosphorescence