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Inkjet printing for electroluminescent devices： emissive materials, film formation, and display prototypes

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Frontiers of Optoelectronics 2017年第4期10卷 329-352页

作者： Luhua LAN jianhua zou Congbiao JIANG Benchang LIU Lei WANG Junbiao PENG Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

Inkjet priming （IJP） is a versatile technique for realizing high-accuracy patterns in a cost-effective manner. It is considered to be one of the most promising candidates to replace the expensive thermal evaporation technique, which is hindered by the difficulty of fabricating low-cost, large electroluminescent devices, such as organic light- emitting diodes （OLEDs） and quantum dot light-emitting diodes （QLEDs）. In this invited review, we first introduce the recent progress of some printable emissive materials, including polymers, small molecules, and inorganic colloidal quantum dot emitters in OLEDs and QLEDs. Subsequently, we focus on the key factors that influence film formation. By exploring stable ink formulation, selecting print parameters, and implementing droplet deposition control, a uniform film can be obtained, which in turn improves the device performance. Finally, a series of impressive inkjet-printed OLEDs and QLEDs prototype display panels are summarized, suggesting a promising future for IJP in the fabrication of large and high-resolution flat panel displays.

关键词： inkjet printing (IJP) inks system film forma-tion organic lightemitting diodes (OLEDs) quantum dotlight-emitting diodes (QLEDs)

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

The effect of spacer in hybrid white organic light emitting diodes

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Chinese Science Bulletin 2014年第25期59卷 3090-3097页

作者： Baiquan Liu Miao Xu Hong Tao Yueju Su Dongyu Gao jianhua zou Linfeng Lan Junbiao Peng Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology New Vision Opto-Electronic Technology Co. Ltd

Two kinds of highly efficient,bright hybrid white organic light emitting diodes have been fabricated by utilizing ambipolar material 4,4-N,N-dicarbazolebiphenyl(CBP)and unipolar material N,N0-di(naphthalene-1-yl)-N,N0-diphenyl-benzidine(NPB)as the spacer,*** adjusting the thickness of spacers together with effectively utilizing combinations of exciton-harnessed orangephosphorescence/blue-fluorescence,the current efficiency of optimal device with CBP spacer and device with NPB spacer are 31.0 and 38.9 cd/A,the maximum power efficiency are 23.9 and 29.1 lm/W,the maximum brightness are 87,249 and 75,501 cd/m2,and the Commission Internationale de l’Eclairage(CIE)coordinates are(0.42,0.43)and(0.47,0.44)at a voltage of 11 V,***,systematic investigations focused on the effects of spacers on device performance have been *** virtue of the multifunctional spacer,energy transfer between the phosphorescent and fluorescent emitters can be avoided while the carriers still can pass through this spacer bridge,which is important to realize such high device *** addition,a novel concept that both ambipolar materials and unipolar materials can be the promising candidates for spacers has been proposed if the thickness of spacers with high triplet energy is optimized.

关键词：有机发光二极管混合隔离物极性材料器件性能能量转移蓝色荧光有效利用

Very-High Color Rendering Index Hybrid White Organic Light-Emitting Diodes with Double Emitting Nanolayers

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Nano-Micro Letters 2014年第4期6卷 335-339页

作者： Baiquan Liu Miao Xu Lei Wang Hong Tao Yueju Su Dongyu Gao Linfeng Lan jianhua zou Junbiao Peng Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology New Vision Opto-Electronic Technology Co. Ltd

A very-high color rendering index white organic light-emitting diode(WOLED) based on a simple structure was successfully fabricated. The optimized device exhibits a maximum total efficiency of 13.1 and 5.4 lm/W at 1,000 cd/m2. A peak color rendering index of 90 and a relatively stable color during a wide range of luminance were obtained. In addition, it was demonstrated that the 4,40,400-tri(9-carbazoyl) triphenylamine host influenced strongly the performance of this *** results may be beneficial to the design of both material and device architecture for high-performance WOLED.

关键词： White light Hybrid Color rendering index Organic light-emitting diodes Double emitting nanolayers

Anomaly and geochemistry of rare earth elements and yttrium in the late Permian coal from the Moxinpo mine,Chongqing,southwestern China

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International Journal of Coal Science & Technology 2014年第1期1卷 23-30页

作者： jianhua zou Dong Liu Heming Tian Tian Li Feng Liu Lin Tan Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment Chongqing Institute of Geology and Mineral ResourcesChongqing 400042China Chongqing Research Center of State Key Laboratory of Coal Resources and Safe Mining Chongqing 400042China Chongqing Institute of Geological Survey Chongqing 401122China

The rare earth elements and yttrium(REY)of the K2 coal from the Moxinpo mine,Chongqing,were determined using inductively coupled plasma mass spectrometry(ICP-MS).The results show that REY are enriched in the K2 coal,with the average content up to 462 lg/g,much higher than average values of most coals in the *** REY distribution patterns indicate that the light REY is enriched and show a well-pronounced Eu *** fractionation of individual light-REY is higher than that of the *** REY distribution through the K2 coal seam shows that the top and bottom portion of the coal seam have a lower content of REY than the middle *** and rhabdophane were identified with a scanning electron microscope equipped with an energy-dispersed X-ray spectrometer(SEM-EDX).The REY distributions through the coal seam,SEM-EDX data and the correlation analysis between ash yields and the concentrations have revealed that the REY mainly occurs in the organic *** K2 coal is a potential rare-metal resource due to its high REY contents,and the coal ash could be regarded as a new and promising raw material for recovery of REY as a by-product.

关键词： Rare earth elements and yttrium Late Permian Chongqing Moxinpo mine

World Integrated Medicine Master Han Jisheng

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World Journal of Integrated Traditional and Western Medicine 2018年第3期4卷 1-10页

作者： zou jianhua han jisheng wjim 不详

Interview Time:April.24th,2018 Location:Home of Academician Han Jisheng Interviewer:Professor zou jianhua,Associate Editor-in-Chief of WJIM Interviewee:Academician Han Jisheng Introduction of Han Jisheng Academician Han Jisheng,male,born in 1928,graduated from Shanghai Medical College as M.D.(1947-1953),and specialized in physiology at Dalian Medical *** served many organizations as follows:Professor and Head,*** Physiology,Peking Medical University,Director of the Neuroscience Research Institute(1993-),Peking University,Member of Chinese Academy of Sciences(1993-),founding president of the Chinese Association for the Study of Pain(CASP)since 1989,and Editor-in-Chief of the Chinese Journal of Pain Medicine,Editor-in-Chief of 7 books including the comprehensive textbook Principles of Neuroscience in Chinese,Grantee of NIDA/NIH,USA(DA 03983)for acupuncture research(1987-2000),Scientific Advisor for WHO(1990-),Consultant of Scientific Review Committee,NIH and ADAMHA,USA,and member of Executive Committee,International Narcotic Research Conference(INRC)(2002-2006).

关键词： Academician Han Dalian Medical Neuroscience Research

World Integrated Medicine Master Shen Baofan

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World Journal of Integrated Traditional and Western Medicine 2019年第2期5卷 1-10页

作者： zou jianhua Shen Baofan WJIM Traditional Chinese Medicine Hospital of Xinjiang Uygur Autonomous Region

Interview Time:15:00 pm,October 13th,2018Location:Shennongjia Forest Area,Hubei ***:*** Shen,thank you very much for accepting the interview of World Journal of Integrated traditional and western Medicine(English vers... 详细信息

关键词： World Integrated Medicine Master Shen Baofan TCM

Highly efficient pure white polymer light-emitting devices based on poly(N-vinylcarbazole) doped with blue and red phosphorescent dyes

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Science China Chemistry 2011年第4期54卷 671-677页

作者： HU SuJun zou jianhua ZHOU GuiJiang LI DongYun WU HongBin SU ShiJian WONG Wai-Yeung YANG Wei PENG JunBiao CAO Yong 1Key Laboratory of Specially Functional Materials Ministry of Education Institute of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhou 510640China Department of Chemistry and Centre for Advanced Luminescence Materials Hong Kong Baptist UniversityWaterloo RoadKowloon TongHong KongChina Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Chemistry Faculty of ScienceXi'an Jiaotong UniversityXi'an 710049China

Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer,poly(N-vinylcarbzole),and an electron-transporting auxiliary,1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]-phenylene,codoped with two phosphorescent dyes:Iridium(III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2') picolinate (FIrpic) and home-made Ir-G2 for blue and red emission,*** the structure of ITO/PEDOT:PSS 4083(40 nm)/emission layer(80 nm)/Ba(4 nm)/Al(120 nm),the device showed a maximal luminous efficiency (LE) of 13.5 cd A-1(corresponding to an external quantum efficiency (EQE) of 6.8%),and a peak power efficiency (PE) of 6.5 lm W-1 at 6.0 ***,the device exhibited pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.34,0.35) at a current density of 12 mA cm-2,which is very close to the equi-energy white point with CIE coordinates of (0.33,0.33).The device performance can be further optimized when more balanced hole/electron injection is achieved by incorporating a lower conducting type anode buffer layer (PEDOT:PSS) and incorporating poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorenene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) as an electron injection layer at the *** optimized device showed an LE of 24.6 cd A-1 (with an EQE of 14.1%),while the peak power efficiency reached 12.66 lm ***,the WPLEDs showed good electroluminescence (EL) stability over a wide range of operating current density and luminance.

关键词： white polymer light-emitting device phosphorescent iridium complex anode buffer layer water-/alcohol-soluble conjugated polymer