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The research of high-brightness organic light-emitting diodes,as an important branch of organic light-emitting diodes (OLEDs),makes it possible for achieving high-brightness lighting source and lasing.Heat dissipation and efficiency roll off,as two main factors,affect the brightness of the OLEDs heavily.In this paper,high-brightness OLEDs are obtained by utilizing pulse voltage,small areas and micro-cavity structure to minimize the effect of the two factors.The major advances,ongoing challenges and future p... 相似文献
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有机电致发光二极管(organic light-emitting diodes,OLED)在过去十多年中间获得了长足的发展,有望成为下一代高效固态光源。器件结构的改进和优化,新型材料的设计和合成以及电致磷光材料的普遍使用,使得目前WOLED的能量效率已经超过了传统的白炽光源。指出了OLED研究中的主要技术瓶颈,并对OLED技术在照明领域面临的机遇和挑战做出评述。 相似文献
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In order to compare two kinds of blue electroluminescent materials,we have investigated two kinds of blue OLEDs with the similar structure ITO/CuPc/NPB/JBEM:perylene/Alq/Mg:Ag[device(J)] and ITO/CuPc/NPB/DPVBi:perylene/Alq/Mg:Ag[device(D)].The difference of luminance and efficiency was not obvious for the two devices,However,there was remarkable difference for their lifetime.The device(J) achieved longer half lifetime of 1035h at initial luminance of 100 cd/m^2,and that of device(D) was only255h,According to their energy level diagrams,the differentce of their stability may originate from different host materials in the two devices.It may be attributed to the better thermal stability of JBEM molecues than that of DPVBi.It is shown that JBEM may be a promising blue organic electroluminescent material with great stability. 相似文献
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The characterization of complexes is particularly critical for quality control and development of gene delivery systems. Here, the method of capillary zone electrophoresis (CZE) for the characterization of DNA and poly-L-lysine (MW 28 500) or DNA and poly-L-lysine modified with polyethylene glycol (MW10000) complexes at various charge ratios in phos-phate buffer is described firstly. During the characterization, DNA complexes can be separated into various components with different charge-to-mass ratio, i.e, components with single physicochemical property. And also the size and zeta potential of complexes were characterized by using photon correlation spectroscopy. This method is useful to characterize various com-plexes formed by DNA and polycations, and has the potential to separate complexes into homogeneous component for better transfection efficiency in vitro and in vivo in future. 相似文献
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该文采用吡啶—巴比妥酸分光光度法对水样中的总氰化物进行测定,探讨了氰化物测定的各预处理体系,选用了9种预处理体系分别对八种金属氰络合物进行了实验研究,并使金属氰络合物与游离氰含量比为1:1的条件下考察其游离情况.实验表明,除3种预处理体系外,其它预处理体系均获得了满意的结果. 相似文献
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1Introduction Sincethefirstreportofefficientorganiclightemit tingdevices(OLED)byTang[1],OLEDshavebeen emergingastheleadingcandidateforthenextgenera tionplat paneldisplaysduetotheiradvantagessuchas fastresponsetime,largeviewingangle,highbright ness,lowoperatingvoltageandverythinthickness.Generally,theemissioncolorsoflayeredOLEDscan beabtainedbyselectingfluorescentmaterialswithdif ferentenergylevelsgapordopingtheorganicfilms withhighlyefficientfluorescentdopants.Sometimes,foracertaincombina… 相似文献
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A new blue electroluminescent material,distyrylarylene(DSA)derivative,4,4‘-bis[2,2-(1-naphthyl,phenyl)vinyl]-1,1-biphenyl(NPVBi)is designed and synthesized.The DSA derivative shows better thermal stability because of its high glass transition temperature.A blue organic light emitting diode(OLED0with the structure ITO/TPD/NPVBi/Alq/LiF/Al is studied.The electroluminescent(EL0spectrum of the OLED exhibits that light emission originates from NPVBi with a peak at 460nm,its Commission Internationale de l‘Eclairage(CIE)color coordinates are x=0.16,y=0.15,and showing independence of CIE color coordinates on current density.The new DSA derivative is expectable as a new candidate for blue light emitter in OLEDs. 相似文献
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以聚环氧氯丙烷二甲胺（PEPIDA）为絮凝剂,测量了化学絮凝过程中由活性黑（KN—B）和活性艳红（K-2BP）构成的二元混合染料模拟有色废水脱色过程中的残留色度分布．溶液残留色度与游离染料、结合态染料、粒子散射5个组分的浓度有关．在PEPIDA投加量不足的区间,KN-3R优先去除．在投加量过量的区间,样品中的残余色度主要来自重新稳定的染料＋PEPIDA配合物,粒子光散射也是降低脱色率的另一个原因,它引起1—4％的脱色率下降．根据残留色度分布曲线,得到KN—B和K-2BP与PEPIDA的结合常数分别为1．86×10^6．72×10^5L／mol． 相似文献
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以C60为代表的球烯与球烯配合物是近年来科学领域的研究热点和焦点。本文介绍了富勒烯金属包合物、简单外接式金属富勒烯配合物、η2-金属富勒烯配合物和金属富勒烯基配合物四种不同类型的金属球烯配合物的合成,着重介绍了金属富勒烯基配合物的研究进展。 相似文献
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1 Introduction Organiclight emittingdiodes(OLEDs)haveattract edconsiderableattentionduetoitsgreatpotentialinefficiency ,low voltage ,large area ,lightweight ,andfull colorflat paneldisplays[1,2 ] .Forfull colordis plays ,itisnecessarytohaveefficientred ,green ,andblueemitterswithappropriatechromaticity .Bycom parisonwiththehighperformanceofblueandgreenOLEDs ,theperformanceandpurechromaticityofredOLEDsarestillrelativelypoor .UsuallyredOLEDsareimprovedbydopingreddyesintohostmaterialswit… 相似文献
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刘丹萍 《郧阳师范高等专科学校学报》2007,27(3):62-63
以Pt（Ⅱ）离子配位化合物为例，研究了该配合物进行取代反应的一般机理，讨论了影响形成平面正方形配合物取代反应的主要因素． 相似文献
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It is difficult to directly dope europium complexes in gel because the excessive water or high acidic condition may lead to their decomposition. We prepared a novel homogeneous TiO2 gel containing Eu-phen complexes by using an in-situ synthesis method. The formation of Eu-phen complexes in sol-gel derived TiO2 was confirmed by luminescence excitation spectra. The effects of temperature and aging time on in-situ synthesis are discussed. The luminescence spectra of gel containing europium complexes were also compared with the pure Eu-phen complexes. 相似文献
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It is difficult to directly dope europium complexes in gel because the excessive water or high acidic condition may lead to their decomposition. We prepared a novel homogeneous TiO2 gel containing Eu-phen complexes by using an in-situ synthesis method. The formation of Eu-phen complexes in sol-gel derived TiO2 was confirmed by luminescence excitation spectra. The effects of temperature and aging time on in-situ synthesis are discussed. The luminescence spectra of gel containing europium complexes were also compared with the pure Eu-phen complexes. 相似文献
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MCM-41和HMS孔内组装[Eu(bpy)2]3+及其光致发光性质 总被引：1，自引：0，他引：1
采用浸渍的方法在MCM-41和HMS介孔材料孔内组装[Eu(bpy)2]3 (bpy:2,2-联吡啶).所得介孔复合材料经XRD、ICP等离子发射光谱、IR、N2吸附实验及光致发光谱进行了表征.实验结果表明:与介孔材料母体相比,组装稀土配合物后的介孔复合材料的BET比表面积、孔径和孔容均有所下降;组装稀土配合物的介孔复合材料在氙光源激发下,均发射出特征的Eu3 光致发光谱;与组装稀土配合物的HMS介孔复合材料相比,组装后的MCM-41介孔复合材料具有较高的光致发光效率.MCM-41介孔材料是一种比HMS合适的载体,有助于增强介孔材料孔内组装稀土配合物的光致发光效率. 相似文献
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芳香醛,酮缩氨基硫脲过渡金属配合物合成方法探讨 总被引：2，自引：0，他引：2
介绍了芳香醛,酮过渡金属配合物,从一些芳香醛,酮缩氨基硫脲过渡金属配合物合成中溶剂、温度,反应介质等条件的选择,归纳了合成这类配合物的基本法则。 相似文献
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分析了八面体配合物和四面体配合物畸变的原因,给出了判断八面体配合物和四面体配合物畸变的一般方法:配合物是否发生畸变要看中心离子电子云是否对称分布,若对称分布,就具有规则的八面体或四面体构型,否则,将会发生变形. 相似文献
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2，4-D在明胶／壳聚糖微球中的包埋与释放 总被引：3，自引：0，他引：3
以明胶／壳聚糖复合物为水相,液体石蜡为连续油相,农药2,4-二氯苯氧乙酸（2,4-D）为芯材,Span80为乳化剂,通过醛交联,采用反相乳液法制备了2,4-D-明胶／壳聚糖微球．考察了制备条件对微球形貌及包封率的影响,并研究了2,4-D在微球中的释放性能．结果表明：当Span80为1mL,油水比为4：1,用一定量甲醛与戊二醛的混合物为交联剂,芯壁材比大于1：14时,制备的微球形态圆整,表面光滑,分散性较好．该复合微球中2,4-D的包封率为70．8％,具有良好的缓释性能,作为一种新型农药剂型可望在农业领域得到应用． 相似文献
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目的：研究四氮杂冠醚铜配合物对免疫功能低下小鼠碳粒廓清水平的影响。方法：腹腔注射（ip）CTX制备小鼠免疫抑制模型,同时灌胃（ig）给药8d,采用分光光度法测定免疫功能低下小鼠碳粒廓清水平,观察四氮杂冠醚铜配合物对非特异性免疫功能的影响。结果：四氮杂冠醚铜配合物显著提高免疫抑制小鼠的碳粒廓清水平（P〈0．01）。 相似文献