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Tuning the structures of polypyridinium salts as bifunctional cathode interfacial layers for all-solution-processed red quantum-dot light-emitting diodes

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Chinese Chemical Letters 2023年第4期34卷 484-488页

作者： Shuguang Fu Xiaojun Yin yang Tang Guohua Xie chuluo yang Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 430072China

Self-doping cathode interfacial layers(CILs) with both favorable electron injection and transport characteristics meet the key requirement for realizing high-performance optoelectronic devices with simplified structures. Herein, four different polypyridinium salts with tunable backbones, side chains and counterions are elaborately designed to afford them desirable film-forming property, polarity, structural rigidity and self-doping feature. All-solution-processed red quantum dot light-emitting diodes(QLEDs) employing them as bifunctional CILs render remarkably improved device performances in contrast to the typical CIL material of poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)](PFN).The maximum external quantum efficiency of 2.74% achieved in this work represents one of the best values among the all-solution-processed QLEDs with individual organic CILs.

关键词： Self-doping Cathode interfacial layer QLED Pyridinium salts All-solution-processable

Acceptor-Donor-Acceptor π-Stacking Boosts Intramolecular Through-Space Charge Transfer towards Efficient Red TADF and High-PerformanceOLEDS

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Research 2022年第4期2022卷 283-294页

作者： Chenglin Jiang Jingsheng Miao Danwen Zhang Zhenhua Wen chuluo yang Kai Li Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Organic push-pull systems featuring through-space charge transfer(TSCT)excited states have been disclosed to be capable of exhibiting thermally activated delayed fluorescence(TADF),but to realize high-efficiency long-wavelength emission still remains a ***,we report a series of strongly emissive orange-red and red TSCT-TADF emitters having(quasi)planar and rigid donor and acceptor segments which are placed in close proximity and orientated in a cofacial *** maxima(λ_(em))of 594−599 nm with photoluminescence quantum yields(PLQYs)of up to 91%and delayed fluorescence lifetimes of down to 4.9μs have been achieved for new acceptor-donor-acceptor(A-D-A)molecules in doped thin *** presence of multiple acceptors and the strong intramolecularπ-stacking interactions have been unveiled to be crucial for the efficient low-energy TSCT-TADF *** light-emitting diodes(OLEDs)based on the new A-D-A emitters demonstrated electroluminescence with maximum external quantum efficiencies(EQEs)of up to 23.2%for the red TSCT-TADF *** EQE of 18.9%at the brightness of 1000 cd m^(-2) represents one of the highest values for red TADF *** work demonstrates a modular approach for developing high-performance red TADF emitters through engineering through-space interactions,and it may also provide implications to the design of TADF emitter with other colours.

关键词： emitter OLED donor

Simple sulfone-bridged heterohelicene structure realizes ultraviolet narrowband thermally activated delayed fluorescence,circularly polarized luminescence,and room temperature phosphorescence

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Science China Chemistry 2022年第9期65卷 1715-1719页

作者： Weimin Ning Han Wang Shaolong Gong Cheng Zhong chuluo yang Department of Chemistry Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan 430072China Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China

Due to narrowband emission and high quantum efficiencies,polycyclic aromatic heterocycles with multi-resonance thermally activated delayed fluorescence(MR-TADF)properties have recently gained considerable attention in the organic optoelectronic *** their great promise in the full visible region covering from blue to red,MR-TADF emitters with ultraviolet emission have been rarely *** locking the two ortho-positions of a triphenylamine core by sulfone groups,a simple polycyclic aromatic heterocycle,BTPT,was facilely constructed,exhibiting 368 nm ultraviolet emission with a narrow full width at half maximum(FWHM)of 33 *** neat film exhibited distinct TADF property with a main emission peak at 388 ***,the enantiomeric crystals of BTPT not only demonstrated significant circularly polarized luminescence(CPL)with large luminescence dissymmetry factor in the 10^(-3) order but also displayed obvious room temperature phosphorescence(RTP).The relationship between this innovative helical unit and unique photophysical properties,including ultraviolet MR-TADF,CPL,and RTP,was reasonably revealed.

关键词： polycyclic aromatic heterocycles thermally activated delayed fluorescence multi-resonance effect ultraviolet emission circularly polarized luminescence room temperature phosphorescence

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High-efficiency all-small-molecule organic solar cells based on an organic molecule donor with an asymmetric thieno[2,3-f]benzofuran unit

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Science China Chemistry 2020年第9期63卷 1246-1255页

作者： Rui Sun Yao Wu Jing Guo Zhenghui Luo chuluo yang Jie Min The Institute for Advanced Studies Wuhan UniversityWuhan 430072China Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 430072China Beijing National Laboratory for Molecular Sciences Beijing 100190China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China

Two p-type small molecules BDTT-TR and TBFT-TR with benzo[1,2-b′:4,5-b′]dithiophene(BDT)and thieno[2,3-f]benzofuran(TBF)as central core units are synthesized and used as donors in all-small-molecule organic solar cells(all-SMOSCs)with a narrow-bandgap small molecule Y6(2,2′-((2 Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2″,3’′:4’,5′]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1 H-indene-2,1-diylidene))dimalononitrile)as the *** comparison to BDTT-TR with centrosymmetric BDT as the central unit,TBFT-TR with asymmetric TBF as the central unit shows red-shifted absorption,higher charge-carrier mobility and better charge pathway in blend *** power conversion efficiency(PCE)of the all-SMOSCs based on TBFT-TR:Y6 reaches 14.03%with a higher short-circuit current density of 24.59 m A cm-2 and a higher fill factor of72.78%compared to the BDTT-TR:Y6 *** PCE of 14.03%is among the top efficiencies of all-SMOSCs reported in the literature to date.

关键词： thieno[2,3-f]benzofuran unit small molecule donor all-small-molecule system absorption coefficient crystallinity

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

Copper(Ⅰ) complexes with planar chirality realize efficient circularly polarized electroluminescence

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Science China Chemistry 2023年第8期66卷 2274-2282页

作者： Ao Ying Lisi Zhan Yao Tan Xiaosong Cao chuluo yang Shaolong Gong Department of Chemistry Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan430072China Shenzhen Key Laboratory of New Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen518060China

Chiral organometallic emitters hold great promise in potential and practical applications of circularly polarized organic lightemitting diodes(CP-OLEDs).However,developing luminescent earth-abundant organometallic complexes concurrently exhibiting circularly polarized luminescence(CPL)and high quantum efficiency remains a formidable *** this study,we introduced a typical planar chiral skeleton of a[2.2]paracyclophane moiety into earth-abundant copper(I)complexes with the goal of realizing efficient CPL and thermally activated delayed fluorescence(TADF)*** pairs of proof-of-theconcept copper(I)enantiomers,R_(p)/S_(p)-MAC^(*)-Cu-CzP and R_(p)/S_(p)-MAC^(*)-Cu-CNCzP,were developed using planar chiral[2.2]paracyclophane-based donor ligands in a carbene-metal-amide(CMA)*** panels of enantiomers not only exhibited significant mirror-image CPL signals but also displayed distinct TADF nature with fast reverse intersystem crossing rates of up to 10^(8)s^(-1).The resultant OLEDs based on the MAC^(*)-Cu-Cz P enantiomers manifested efficient circularly polarized electroluminescence with excellent external quantum efficiencies of 13.2%and ultraslow efficiency roll-off(7.7%at 10,000 nits).This article not only demonstrates one of the best performances for CP-OLEDs based on earth-abundant organometallic complexes but also represents the first example of CP-OLEDs from CMA complexes to our knowledge.

关键词： circularly polarized luminescence(CPL) organic light-emitting diode(OLED) copper(Ⅰ)complex carbene-metal-amide(CMA) thermally activated delayed fluorescence(TADF)

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Altering alkyl-chains branching positions for boosting the performance of small-molecule acceptors for highly efficient nonfullerene organic solar cells

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Science China Chemistry 2020年第3期63卷 361-369页

作者： Zhenghui Luo Rui Sun Cheng Zhong Tao Liu Guangye Zhang yang Zou Xuechen Jiao Jie Min chuluo yang Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhan 430072China eFlexPV Limited(China) ShenzhenChina Department of Materials Science and Engineering Monash UniversityVictoriaAustralia

The emergence of the latest generation of small-molecule acceptor(SMA)materials,with Y6 as a typical example,accounts for the surge in device performance for organic solar cells(OSCs).This study proposes two new acceptors named Y6-C2 and Y6-C3,from judicious alteration of alkyl-chains branching positions away from the Y6 *** to the Y6,the Y6-C2 exhibits similar optical and electrochemical properties,but better molecular packing and enhanced *** contrast,the Y6-C3 shows a significant blue-shift absorption in the solid state relative to the Y6 and *** as-cast PM6:Y6-C2-based OSC yields a higher power conversion efficiency(PCE)of 15.89%than those based on the Y6(15.24%)and Y6-C3(13.76%),representing the highest known value for as-cast nonfullerene ***,the Y6-C2 displays a good compatibility with the ***,a ternary OSC device based on PM6:Y6-C2:PC71BM(1.0:1.0:0.2)was produced,and it exhibits an outstanding PCE of 17.06%and an impressive fill factor(FF)of *** results improve understanding of the structureproperty relationship for state-of-the-art SMAs and demonstrate that modulating the structure of SMAs via fine-tuning of alkylchains branching positions is an effective method to enhance their performance.

关键词： alkyl-chain branching position small molecular acceptor organic solar cell power conversion efficiency fill factor

Versatile boron-based thermally activated delayed fluorescence materials for organic light-emitting diodes

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Aggregate 2022年第5期3卷 100-129页

作者： Jianmei Han Yanying Chen Nengquan Li Zhongyan Huang chuluo yang Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhenPeople’s Republic of China

During the last few years,organoboron-based thermally activated delayed fluorescence(TADF)materials have received extensive attention in optoelectronic area,owing to the unique electronegativity of boron ***,many research progress of organoboron-based TADF materials for organic optoelectronic devices is *** review comprehensively documents the organoboron-based TADF materials according to the emission colors from blue to red-near-infrared(red-NIR),covering the molecular design strategies,photophysical properties,and optoelectronic performance in organic light-emitting diodes(OLEDs).The current progress and future challenges in this fast-growing fields are reviewed systematically,providing instructive guidance for the future research on high-performance TADF-OLEDs.

关键词： narrow-band emission organic light-emitting diodes organoboron thermally activated delayed fluorescence

Tetradentate cyclometalated platinum complex enables high-performance near-infrared electroluminescence with excellent device stability

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Chinese Chemical Letters 2023年第2期34卷 511-514页

作者： Chengjun Wu Youming Zhang Jingsheng Miao Kai Li Weiguo Zhu chuluo yang Shenzhen Key Laboratory of New Information Display and Storage Materials Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications Changzhou UniversityChangzhou 213164China

Due to the high decay rate of the non-radiative transition of long wavelengths, the molecular design of efficient and stable near-infrared(NIR) electroluminescent materials remains a big challenge. Herein,a new tetradentate cyclometalated platinum(II) complex with an N∧C∧C∧N coordinated framework has been developed and used as a dopant for NIR organic light-emitting diodes(OLEDs). The complex exhibited a short-lived(0.5–1.5 μs) metal-to-ligand charge transfer(MLCT) excited state in doped and neat films. The resulting NIR OLEDs(λ_(EL)= 730 nm) achieved maximum external quantum efficiency(EQE_(max))of 5.2% and radiance of 74626 m W sr^(-1)m^(–2). Of note, the device exhibited excellent stability with operational lifetime of 119 h for LT_(90). This work demonstrated the great potential of tetradentate platinum(II)complexes in the field of NIR OLEDs.

关键词： Near-infrared emitter Phosphorescence Platinum complex OLED Operational lifetime