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Synthesis and light-emitting properties of 2-(N-phenyl-α-naphthylamino) and 2-dimesitylboron-7-(N-phenyl-α-naphthylamino)-9,9-diethylfluorene

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Science China Chemistry 2009年第7期52卷 952-960页

作者： ZHANG WenGuan HE ZhiQun HUI GuanBao MU LinPing WANG YongSheng ZHAO ShengMin JING XiPing Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China Laboratory of Printing and Packaging Material and Technology and Beijing Area Major Laboratory Beijing Institute of Graphic CommunicationBeijing 102600China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

A fluorescent organic triarylamine with a symmetric structure, 2,7-bis(N-α-naphthyl-phenylamino)-9,9- diethylfluorene (NPAEF) was synthesized using two methods, modified Ullmann coupling and modified palladium-catalyzed amination. An activated copper and a combination of Pd(OAc)2/P(t-Bu)3 and Pd(dba)2/P(t-Bu)3 were selected as catalysts to improve yields of reactions. These synthetic procedures were also successfully applied to an asymmetric 2-dimesitylboron-7-(N-phenyl-α-naphthylamino)-9,9-diethylfluorene (BNPEF). Photoluminescent emission peaks in solid film and in diluted solution of NPAEF were both observed at 461 nm, while the main emission peaks of BNPEF appeared at 422 nm in hexane, and at 480 nm in methanol. The double emission peaks of BNPEF in hexane reflected fine structure in the vibrational state. With an increasing polarity of solvent, the main PL emission peaks were red-shifted and vibrational fine structure disappeared. Additionally, energy levels of NPAEF were investigated and an electroluminescence (EL) device of ITO/PVK:NPAEF/Al was fabricated, which showed a turn-on voltage of 9 V and peaked at 462 nm. The EL spectrum was in good agreement with PL spectrum, which indicated that they were from the same emitting center in the device.

关键词： catalysis fluorene dimesitylboron triarylamine light-emitting

Achieving high-performance phosphorescent organic light-emitting diodes using thermally activated delayed fluorescence with low concentration

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Optoelectronics Letters 2019年第5期15卷 347-351页

作者：胡俊涛陆超超王鹏李杰许凯王向华 National Engineering Lab of Special Display Technology State Key Lab of Advanced Display Technology Academy of Opto-Electronic Technology Hefei University of Technology Hefei 230009 China School of Instrument Science and Opto-electronics Engineering Hefei University of Technology Hefei 230009 China

We fabricated phosphorescent organic light-emitting diodes(Ph OLEDs) using thermally activated delayed fluorescence(TADF) material 10,10’-(4,4’-sulfonylbis(4,1-phenylene)) bis(9,9-dimethyl-9,10-dihydroacridine)(DMAC-DPS) with low concentration, which showed better performance compared with 1,3-bis(carbazole-9-yl) benzene(m CP) based devices. When the concentration of DMAC-DPS was 1 wt%, the driving voltage of the device was only 3.3 V at 1 000 cd/m2, and the efficiency and lifetime of the device were effectively improved compared with those of m CP based devices. The result indicated that DMAC-DPS could effectively improve the performance of phosphorescent devices. We believe that the better device performance can be attributed to the optimization of the energy transfer process in the emitter layer and lifetime of triplet excitons by DMAC-DPS. The study may provide a simple and effective strategy to achieve high-performance OLEDs.

关键词： phosphorescent organic light-emitting diodes(Ph OLEDs) thermally activated delayed fluorescence(TADF) DMAC-DPS

Tandem organic light-emitting diodes with buffer-modified C60/ZnPc as charge generation layer

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Optoelectronics Letters 2019年第3期15卷 185-189页

作者：陈爱王振谢嘉凤王培 School of Optoelectronic Engineering Chongqing University of Posts and Telecommunications

In this paper, a significant enhancement in current efficiency of the green tandem organic light-emitting diodes(TOLEDs) is demonstrated, which is based on a buffer-modified charge generation layer(CGL) of fullerene carbon(C60)/zinc-phthalocyanine(ZnPc). Al and MoO3 were used as the buffer-modified layers on both sides of the bilayer C60/ZnPc, respectively. Experimental results show that the inserted Al and MoO3 layers can effectively increase the electron extraction of the CGL for obtaining the device performance enhancement. Compared with that of the green TOLEDs without buffer-modified layers in CGL(37.3 cd·A-1), the current efficiency of the green TOLEDs is increased to 54.1 cd·A-1. Further study results find that the performance can also be improved by optimizing the thickness of Al in the CGL. The maximum current efficiency and maximum luminance of the green TOLEDs achieve 63.5 cd·A-1 and 17 873 cd·m-2, respectively, when the multilayer structure of the CGL is Al(3 nm)/C60(5 nm)/ZnPc(5 nm)/MoO3(3 nm).

关键词： TOLED OLEDs CGL Tandem organic light-emitting diodes with buffer-modified C ZnPc as charge generation layer NPB Al

Germafluorene conjugated copolymer——synthesis and applications in blue-light-emitting diodes and host materials

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Science China Chemistry 2009年第2期52卷 212-218页

作者： CHEN RunFeng ZHU Rui ZHENG Chao LIU ShuJuan FAN QuLi HUANG Wei Jiangsu Key Laboratory for Organic Electronics and Information Displays Institute of Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210046China Institute of Advanced Materials Fudan UniversityShanghai 200433China

A germafluorene-fluorene copolymer was successfully obtained via Suzuki polymerization.The ger-manium containing copolymer has an efficient blue light emission under the ultraviolet irradiation and its single layer EL device showed the highest brightness of 2630 cd/m2 at 7.8 V and the highest effi-ciency of 0.301 lm/W at 6.2 V.The copolymer can also serve as the host material for phosphorescent metal complexes with the maximum brightness of 15600 cd/m2 and the quantum efficiency of 8.5%.The results are quite promising and promise that as its analogs of fluorene and silafluorene,germafluorene is an excellent building block for blue light-emitting polymers and host materials.

关键词： conjugated polymers germafluorene heteroatom-containing polymers host material light-emitting diodes(LEDs)

Highly efficient stacked organic light-emitting devices employing a novel intermediate layer

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Science China(Technological Sciences) 2009年第1期52卷 95-98页

作者： NIU LianBin GUAN YunXia REN Yue KONG ChunYang MA Yan LIANG YiPing Key Laboratory of Optical Engineering College of Physics and Information TechnologyChongqing Normal UniversityChongqing 400047China

Highly efficient stacked organic light-emitting devices (OLEDs) have been fabricated using Mg:Alq3:BCP/ WO3 as a novel intermediate layer, which connects two identical emissive units. The stacked OLEDs consisting of NPB/Alq3 exhibited high current efficiency and brightness characteristics over conven- tional single-unit device. At 200 mA/cm2, the current efficiency of the stacked OLEDs using the inter- mediate layers of Mg:Alq3:BCP/WO3 were about 6.85 cd/A, doubling that of the conventional device. The results may prove the method to be effective to enhance the current efficiency and brightness of OLEDs.

关键词： organic light-emitting devices Mg:Alq3:BCP/WO3 stacked

Novel high-brightness tunneling-regenerated multi-activeregion AlGaInP light-emitting diode

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Science China(Technological Sciences) 2003年第2期46卷 204-208页

作者：郭霞沈光地王国宏王学忠杜金玉高国王康隆 Institute of Electronic Engineering and Information Beijing University of Technology & Beijing Optoelectronic Tech-nology Laboratory Device Research Laboratory Department of Electrical Engineering University of California at Los Angeles Los Angeles

In order to resolve the prevailing problems in conventional light-emitting diodes (LEDs), novel high-efficiency tunneling-regenerated multi-active-region (TRMAR) LEDs are proposed, which have such advantages as low heat generation, carrier overflow level and non-radiation re-combination rate and whose quantum efficiency and the output optical power can be scaled with the number of the active regions. Experiments show that the on-axis luminous intensity of TRMAR LEDs increases linearly with the number of active regions. The novel LEDs have high quantum efficiency under low current injection and their maximum on-axis luminous intensity exceeds 5 candelas at 20 mA current injection at the peak wavelength of 625 nm with a 15?angle cap.

关键词： high-brightness, AlGaInP, light-emitting diodes.

Molecular hosts for triplet emitters in organic light-emitting diodes and the corresponding working principle

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Science China Chemistry 2010年第8期53卷 1679-1694页

作者： MI BaoXiu1,2,GAO ZhiQiang1,LIAO ZhangJin2,HUANG Wei2 & CHEN Chin Hsin3 1Jiangsu Engineering Center for Flat-Panel Displays & Solid-State lighting School of Materials Science & Engineering,Nanjing University of Posts & Telecommunications,Nanjing 210046,China 2Key Laboratory for Organic Electronics & Information Displays (KLOEID),Institute of Advanced Materials (IAM),Nanjing University of Posts & Telecommunications,Nanjing 210046,China 3Display Institute,Microelectronics and Information Systems Research Center,National Chiao Tung University Hsinchu,Hsinchu,300 China Jiangsu Engineering Center for Flat-Panel Displays & Solid-State lighting School of Materials Science & Engineering Nanjing University of Posts & Telecommunications Nanjing China Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications Nanjing China Display Institute Microelectronics and Information Systems Research Center National Chiao Tung University Hsinchu Hsinchu China

This paper summarizes the mechanism and routes for excitation of triplet emitters in dopant emission based phosphorescent organic light-emitting diodes (PhOLEDs),providing a comprehensive overview of recent progress in molecular hosts for triplet emitters in PhOLEDs.Particularly,based on the nature of different hosts,e.g.,hole transporting,electron transporting or bipolar materials,in which the dopant emitters can be hosted to generate phosphorescence,the respective device performances are summarized and compared.Highlights are given to the relationships among the molecular structure,thermal stability,triplet energy,carrier mobility,molecular orbital energy level and their corresponding device performances.

关键词： phosphorescent organic light-emitting diodes (OLEDs) working principle electrophosphorescence hosts triplet emitter

Flexible organic light-emitting diodes with poly-3,4-ethylene-dioxythiophene as transparent anode

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Chinese Science Bulletin 2002年第23期47卷 1979-1982页

作者： Qiu, Y Duan, L Wang, LD Tsinghua Univ Organ Optoelect Lab Beijing 100084 Peoples R China

The flexible oragnic light-emitting diodes (OLEDs) fabricated on poly -3,4-ethylenedioxythiophene/poly -styrenesulfonate(PEDOT/PSS) coated substrates were demonstrated. How the fabricating processes and the device structure will affect the device performance was studied and the atomic force microscopy was employed to analyze the mophorlogy of the conducting polymer anode. Under optimized conditions, flexible OLEDs with PEDOT anode showed the brightness up to 2760 cd/m2 and maximum external quantum efficiency of 1.4%. These data are comparable to those of conventional flexible OLEDs with ITO anode.

关键词： PEDOT oragnic light-emitting diodes flexible display.

Organic light-emitting devices based on 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl as a spacer between dual ultrathin layers

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Optoelectronics Letters 2019年第2期15卷 127-131页

作者：吴丽双王晓琳尤嘉萍苏子生杨惠山 Department of Physics Quanzhou Normal University

White organic light-emitting devices(WOLEDs) were fabricated by using a highly blue fluorescent dye of 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl(DPVBi) and a red fluorescent dye of 5H-benzo[ij] quinolizin-9-yl) ethenyl]-4H-pyran-4-ylidene] propane-dinitrile(DCM2), together with a green fluorescent dye of 10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1 H,5 H,11 H-(1)-benzopyroyran-o(6,7-8-i,j) quinolizin-11-one(C545 T).The multilayer WOLEDs does not involve the doping process.The structure of the device is indium tin oxide(ITO)/4,4',4''-tris{N,-(3-methylphenyl)-N-phenylamin}triphenylamine(m-MTDATA)(55 nm)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biph-enyl-4,4'-diamine(NPB)(10 nm)/DPVBi(8 nm)/C545 T(x nm)/DPVBi(5 nm)/DCM2(y nm)/tris-(8-hydroxyquinoline) aluminum(Alq3)(60 nm)/LiF(1 nm)/Al, where the DPVBi is introduced as a spacer.By changing the thicknesses of dual ultrathin layers of C545 T and DCM2, the WOLED is obtained.When x=y=0.05, the Commission Internationale de 1'Eclairage(CIE) coordinates of the device change from(0.262 6, 0.351 4) at 4 V to(0.214 7, 0.269 3) at 12 V that are well in the white region.Its maximum luminance is 41400 cd/m^2 at 13 V, and the maximum current efficiency and the maximum power efficiency are 7.95 cd/A at 6 V and 5.37 lm/W at 5 V, respectively.

关键词： light-emitting layers efficiency