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Full Color and Monochrome PM PLED FPDs Made with Solution Processes

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Full Color and Monochrome PM PLED FPDs Made with Solution Pr...

2007亚洲显示国际会议

作者： junbiao peng Qiaoli niu Yuxuan Shao Wei xu Lei Wang Shaohu Han Nanliu Liu Yong cao Jian Wang Institute of polymer optoelectronic materials and devices south china university of technology and Key Lab of Specially Functional materials Ministry of Education guangzhou 51064. china

＜正＞1.5 inch diagonal red,green,and blue monochrome passive-matrix （PM） polymer fight emitting diodes （PLED） flat panel displays （FPDs） with format 96×64 were fabricated by spin-coating technology with device structure of ITO/PE- DOT/Emissive layer/Ba/*** rearranging the location and the direction of the panel with respect to the center of the spinner,the piling of organic materials under the cathode separator was significantly reduced,resulting in a more uniform light *** final display showed neither dead pixels nor dead *** efficiencies of 1.37,9.5 and 1.44 cd/A,and CIE color coordinates of （0.62,0.37）,（0.37,0.60） and （0.15,0.13）,for red,green,and blue monochrome displays,respectively,have been ***,1.5″ full color PM PLED FPDs with format 96×RGB× 64 was successfully fabricated by inkjet printing *** current efficiency was more than 1 cd/A at full screen white with color coordinates located at （0.34,0.35）.A color gamut of 50% NTSC was *** all the displays, the 5-point uniformity was more than 80%.

关键词： Passive Matrix Full Color Displays polymer Light Emitting Diodes Spin-coating Inkjet

Molecular Red Electrofluorescent Emitters: Design, Synthesis and Characterizations

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Molecular Red Electrofluorescent Emitters: Design, Synthesis...

中国化学会第26届学术年会有机固体材料分会场

作者： Ju Huang, Chun Li, Jian-hua Zou, Yang-Jun Xia, xu-Hui Zhu, junbiao peng and Yong cao Institute of polymer optoelectronic materials and devices, and Key Laboratory of Special Functional materials, MOE, south china university of technology, guangzhou 51064.

＜正＞New molecular red electrofluorescent emitters based on dithienylbenzothiadiazole have been synthesized and characterized. Light-emitting devices based on both solution processing and

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Stability study of saturated red polymer light-emitting diodes

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Chinese Science Bulletin 2007年第12期52卷 1612-1615页

作者： xu Wei peng junbiao xu YunHua WANG Jian HUANG Zhe niu QiaoLi cao Yong Institute of polymer optoelectronic materials and devices Key Laboratory of Special Functional Materials and Advanced Manufacturing Technology South China University of Technology Guangzhou 510640 China

Saturated red polymer light-emitting diodes have been fabricated with a single emitting polymer blend layer of poly[2-(2-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) and poly[9,9-dioc- tylfluorene-co-4,7-di-2-thienyl-2,1,3-benzothiadiazole] (PFO-DBT15). Saturated red emission with the Commission Internationale de l’Eclairage (CIE) coordinates of (0.67, 0.33) was obtained. The device stability was investigated. The results showed that energy transfer occurred from MEH-PPV to PFO-DBT15, and MEH-PPV improved the hole injection and transportation.

关键词：红色有机发光二极管稳定性半导体空子注射

Saturated red light emitting polymers and devices

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Saturated red light emitting polymers and devices

2007亚洲光电子会议LED材料与器件分会场

作者： Y. Shao W. xu N. Liu L. Yin Q. hou Y. xu W. Zeng L. Wang S. Han J. Wang J. peng Y. cao Institute of polymer optoelectronic materials and devices Key Laboratory of Special Functional materials south china university of technology guangzhou 51064. china

A series of saturated red emission copolymers, polyfluorene copolymers （PFO-DBT）, were synthesized and characterized. The saturated red EL emission from the copolymer peaking at about 677 nm and electroluminescence （EL） efficiency of 1.4% based on simple device structure of ITO/PEDOT/PFO-DBT/Ba/Al, were achieved. The operation mechanism of the device was discussed and it was found that hole carrier injection is the major obstacle for improving EL efficiency and EL stability. To overcome such problem, we utilized MEH-PPV which has low HOMO level blended with the PFO-DBT copolymer to improve EL efficiency to 1.7%. Simultaneously, the EL emission lifetime of the device with PFO-DBT:MEH-PPV （50:50） blended polymer extended to 2000hrs. Monochrome passive red emission displays with the blended polymer were fabricated, and exhibited excellent pictures.

关键词： polymer light emitting diodes Red Emission Lifetime Monochrome Passive Display

Doping-free tandem white organic light-emitting diodes

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Science Bulletin 2017年第17期62卷 1193-1200页

作者： Baiquan Liu Lei Wang Hong Tao Miao xu Jianhua Zou Honglong Ning junbiao peng Yong cao Institute of polymer optoelectronic materials and devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyCuangzhou 510640China

Tandem white organic light-emitting diodes(WOLEDs) are of great research interest since they can greatly boost the performance compared with the single-unit counterparts. However, their structures are more complicated than those of single-unit OLEDs. Besides, to achieve high performance, the doping technology is required to tandem OLEDs, particularly for tandem WOLEDs, further complicating the structures. Herein, doping-free tandem WOLEDs, for the first time, have been demonstrated. By managing an effective doping-free charge generation layer to interconnect doping-free emitting layers/charge transport layers, high-performance doping-free tandem WOLEDs have been developed. The blueyellow device accomplishes the simplified structure/short fabrication time/reduced cost/high efficiency/low efficiency roll-off/low voltage/high luminance trade-off, which cannot be achieved by previous tandem WOLEDs. Remarkably, the efficiency(81.2 cd A^(-1)) is ~2-fold higher than the highest efficiency of previous doping-free WOLEDs and even higher than those of some best doping tandem WOLEDs. The maximum luminance is 44,886 cd m^(-2), which is the highest for doping-free ***, the blue-red device can exhibit a color rendering index(CRI) of 67, which is even higher than that of some representative three-color tandem WOLEDs. Such findings may not only represent a significant step for doping-free WOLEDs, but unlock a novel avenue that doping-free tandem WOLEDs are promising to achieve the simplicity and high performance trade-off.

关键词： Organic light-emitting diodes Doping-flee Tandem White Efficiency

Full-color quantum dots active matrix display fabricated by ink-jet printing

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Science china Chemistry 2017年第10期60卷 1349-1355页

作者： Congbiao Jiang Lan Mu Jianhua Zou Zhiwei He Zhenji Zhong Lei Wang Miao xu Jian Wang junbiao peng Yong cao State Key Laboratory of Luminescent materials and devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou 510640 China guangzhou New Vision Opto-Eleetronic technology Co. Ltd. Guangzhou 510730 China

Making full-color active matrix display based on quantum dot light emitting diodes(AM-QLEDs) via ink-jet printing is attractive in display industry due to QLEDs' wide color gamut and their potential manufacturing advantages of large screen size and low cost. The challenges for realizing AM-QLED display are how to achieve high quality films through ink-jet printing, multi-color patterning, electroluminescence(EL) color purity, and high efficiency. Herein, a 2-inch diagonal full-color AM-QLEDs display with pixel density of 120 pixels per inch(PPI) fabricated by ink-jet printing technique is presented. Driven by a metal oxide TFT(MOTFT) back-panel, the display exhibits a maximum brightness of 400 cd m.2, and a color gamut of 109%(NTSC 1931). The red, green, and blue(RGB) monochrome QLEDs passive matrix panels fabricated by ink-jet printing technique have a current efficiency(CE) of 2.5, 13.9, and 0.30 cd A.1, respectively. To the best of our knowledge, the efficiencies are the highest among passive matrix QLEDs panels made by ink-jet printing technique. The ink-jet printed QDs films show good thickness uniformity due to high viscosity and low volatility of the printable inks, and no cross-contamination between adjacent pixels resulting from the hydrophobic pixel defining layer.

关键词： full-color display quantum dot light emitting diodes ink-jet printing technology pixel defining layer

Appending triphenyltriazine to 1,10-phenanthroline: a robust electron-transport material for stable organic light-emitting diodes

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Science Bulletin 2018年第7期63卷 446-451页

作者： Guang Jin Jun-Zhe Liu Jian-Hua Zou Xiao-Lan Huang Meng-Jiao He Ling peng Ling-Ling Chen xu-Hui Zhu junbiao peng Yong cao State Key Laboratory of Luminescent materials and devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology (SCUT)

There has been an increasing demand for high-performance and cost-effective organic electron-transport materials for organic light-emitting diodes （OLEDs）. In this contribution, we present a simple compound 3-（3-（4,6-diphenyl-l,3,5-triazin-2-yl）phenyl）-1,10-phenanthroline through the facile Pd-catalyzed coupling of a triphenyltriazine boronic ester with 3-hromo-1,10-phenanthroline. It shows a high Tg of 112℃. The ultraviolet photoelectron spectroscopy measurements reveal a deep HOMO level of -6.5 eV. The LUMO level is derived as -3.0 eV, based on the optical bandgap. The low-temperature solid-state phosphorescent spectrum gives a triplet energy of -2.36eV. n-Doping with 8-hydroxyquinolatolithium （Liq, 1：1） leads to considerably improved electron mobility of 5.2 × 10 -6 -5.8 × 10 -5 cm2 v-1 S-1 at E=（2-5） × 10 5Vcm -1, in contrast with the triarylphosphine oxide- phenantroline molecular conjugate we reported previously. It has been shown that through optimizing the device structure and hence suppressing polaron-exciton annihilation, introducing this single Liq-doped electron-transport layer could offer high-efficiency and stable phosphorescent OLEDs.

关键词： Electron transport materials Organic light-emitting diodes Phenanthroline Device stability Triazine

A concise synthesis of organic small-molecular cathode interfacial materials for organic electronics

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A concise synthesis of organic small-molecular cathode inter...

中国化学会第29届学术年会

作者： Wan-Yi Tan Jian-Hua Zou xu-Hui Zhu junbiao peng Yong cao State Key Laboratory of Luminescent materials and devices and Institute of polymer optoelectronic materials and devices South China University of Technology （SCUT）

Recent years have witnessed tremendous progress of organic electronics towards practical *** others,the quest for stable cathodes that perform effective electron injection or collection has led to an increasingly large number of cathode interfacial materials,ranging from inorganics to organic small molecules and *** report hereby our recent effort on pursuing organic small-molecular cathode interfacial materials with an emphasis particularly on concise synthesis and *** resultant function in organic electronic devices such as organic photovoltaics and light-emitting diodes is *** some cases,preliminary data on device stability are provided.

关键词： cathode interfacial materials small molecules organic photovoltaics organic light-emitting diodes

Diselenide as a Dual Functional Mechanophore Capable of Stress Self-Reporting and Self-Strengthening in Polyurethane Elastomers

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CCS Chemistry 2023年第4期5卷 925-933页

作者： Xiaopei Li Fan Yang Yiran Li Cheng Liu peng Zhao Yi cao Huaping xu Yulan Chen Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072 Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructureNanjing UniversityNanjingJiangsu 210093 Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular EngineeringTsinghua UniversityBeijing 100084 College of Chemistry State Key Laboratory of Supramolecular Structure and MaterialsJilin UniversityChangchunJilin 130012

Unlike biological materials that can sense mechanical force and actively remodel locally,synthetic polymers typically break down under ***-level responses to damage with both stress-reporting and self-strengthening functions are significant yet difficult to realize for synthetic *** overcome this challenge,chemo-mechanical coupling into polymers that can simultaneously ameliorate mechanical,optical,or other functional properties of a polymer combined with mechanical treatment will offer a new principle for materials ***,we report a kind of elastomer in which destructive forces are channelled into productive and bond-forming reactions by using diselenide(Se–Se)as a *** has been functionalized with labile Se–Se bonds,whosemechanical activation generates seleno radicals that trigger radical transfer and cross-linking reactions in *** reactions are activated efficiently in a mechanical way by compression in bulk *** resulting covalent networks possess turn-on mechano-fluorescence and increased moduli,which provide the functions of stress reporting,mechano-healing,and mechano-remodeling for the deformed *** study not only illuminates themechano-responsive nature of Se–Se bonds in the bulk state but also paves the way for the development of new stress-responsive materials.

关键词： diselenide mechano-responsive polymers self-strengthening polymermechanochemistry stress sensing