Highly Efficient Electrophosphorescence from a Grafted Biscyclometalated Iridium Complex with Triarylamine Unit in Polymer Light-Emitting Devices

The electroluminescence performance from a novel grafted cyclometalated iridium complex (BuPhNPPy)2Ir(acac)with triarylmine unit, where BuPhNPPy is N,N-di(4-tert-butylphenyl)-4-(2-pyridyl) phenylamine and Hacac is acetylacetone, is demonstrated in the double-layered polymer light-emitting devices (PLEDs). The PLEDs emit intense green phosphorescence at 533 nm with a shoulder peak of 566 nm employing 4 wt. % (BuPhNPPy)2Ir(acac)doped a blend of poly(vinylcarbazole) (PVK) and 2-tert-butylphenyl-5-biphenyl-l,3,4-oxadiazole (PBD) as the emitting layer. A maximum luminance of 14610cd/m^2 at voltage of 24 V and a maximum external quantum efficiency Eext of 10.4% photons per electron (ph/el) at current density of 32mA/cm^2 are achieved. When the current density is raised to 100mA/cm^2, Eext of the device still remained to 8.3% ph/el. This indicates that the triplet-triplet annihilation is restrained more effectively at high current density. The improvement of electrophosphorescence performances of the iridium complex may be contributed to an ortho-substituent effect of grafted triarylmine unit.     

噻吩甲酰三氟丙酮-酰基吡唑啉酮-邻菲咯啉合铕(Ⅲ)四元配合物的合成和表征

A novel chelate Eu(TTA)2(PMTBBP)Phen, which contained ligand 1-pheny-3-methyl-4-(4′-t-butylbenzoyl)-5-pyrazolone (HPMTBBP), 4,4,4-trifluro-1-(2-thienyl)-1, 3-butandione (HTTA) and phenanthroline(Phen), was synthesized. Its chemical structure was elucidated by IR, UV, 1H NMR,MS, DSC and elementary analysis. The influence of acylpyrazolone on fluorescent intensity of the new chelate was studied. The results showed that Eu (TTA)2 (PMTBBP)Phen had more excellent PL properties and better film formation than that of Eu(TTA)3Phen.     

噻吩甲酰三氟丙酮—酰基吡唑啉酮—邻菲咯啉合铕（Ⅲ）四？…

近年来 ,稀土金属螯合物因其发光色度纯 ,荧光量子效率高 (理论可达 1 0 0 % ) ,在有机电致发光平板显示器研究中得到广泛应用[1～ 3] .用噻吩甲酰三氟丙酮作为配阴离子与稀土离子Ｅｕ3+配位 ,可得到红色电致发光材料[4～ 6] .为提高这类配合物的电致发光强度和发光效率 ,增强配体与稀土离子间的敏化作用 ,改善配合物的载流子传输性和成膜性十分重要 .本文利用配阴离子 4 叔丁基苯甲酰基吡唑啉酮 (ＨＰＭＴＢＢＰ)和噻吩甲酰三氟丙酮 (ＨＴＴＡ)和中性配体 1 .1 0 邻菲咯啉 (Ｐｈｅｎ)与铕 (Ⅲ )作用 ,合成了铕 (Ⅲ )四元配合物 [Ｅｕ(ＴＴ…     

含高碳糖片断的氨基醇及水解产物的波谱分析

利用C10高碳糖合成了具有潜在生物活性的含有高碳糖结构片断的氨基醇,检测了该氨基醇及其水解产物的¹H、¹³C NMR图谱,确证了该类化合物的结构,通过¹H-¹H COSY,HMQC,HMBC等2D NMR 技术对其水解产物的¹H和¹³C NMR数据进行了全归属和较详细的解析.     

席夫碱型液晶冠醚的合成与性质

以4-(4'-烷氧基联苯基-4-羧基)苯甲醛和二氨基二苯并-14-冠-4为原料,通过溶液缩合反应,合成了一系列席夫碱型液晶冠醚.并用元素分析、旋光仪、核磁共振、红外光谱、快原子轰击质谱、基质辅助激光解析电离飞行时间质谱、示差扫描量热法和偏光显微镜对其进行了表征.发现化合物2,4,8I和8Ⅱ加热至各自的熔点以上都能形成液晶态,在液晶态可以观察到手性近晶C相、近晶相、胆甾相和向列相的典型织构.随分子末端烷氧基碳原子数增加,化合物(除2A和4A外)的熔点(Tm)和液晶态的清亮点(Ti)呈规律性变化,近晶相范围渐增,而近晶相-向列相转变温度和向列相温度范围递减.     

Improved Blue-Green Electrophosphorescence from a Tuning Iridium Complex with Benzyl Group in Polymer Light-Emitting Devices

Electroluminescence performances from a tuning biscyclometlated iridium complex with benzyl group are demonstrated in double-layered polymer light-emitting devices （PLEDs） using a blend of poly（9,9-dioctylfluorene） and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix. Blue-green electrophosphorescent emission with a peak at 521 nm and a shoulder at 492nm was observed. The highest luminance efficiency of 4.8cd/A at current density of 0. 56 mA/cm^2 and a maximum luminance of 1944 cd/m^2 at 217.6 mA/cm^2 were achieved in the devices at the dopant concentration of 8%. The luminous performance of the devices becomes better with increasing dopant concentrations from 1% to 8%. This implies that the concentration quenching of this iridium complex with benzyl group can be efficiently inhibited in the devices.     

新型光固化助剂缩丙二醇二丙烯酸双酯的合成

新型光固化助剂缩丙二醇二丙烯酸双酯的合成朱卫国林原斌朱美香吴添智（湘潭大学化学化工学院４１１１０５）缩丙二醇二丙烯酸双酯是近年开发出来的一种优良光固化材料和多官能团交联剂，其优点主要表现在：（１）其醚链结构有许多甲基支链，这样流平性较缩乙二醇二丙烯酸...     

Enhanced Green Electrophosphorescence from Oxadiazole-Functionalized Iridium Complex-Doped Devices Using Poly（9,9-Dioctylfluorene） Instead of Poly（N-Vinylcarbazole） as a Host Matrix

Optoelectronic properties of the oxadiazole-functionalized iridium complex-doped polymer light-emitting devices （PLEDs） are demonstrated with two different polymeric host matrices at the dopant concentrations 1-8%. The devices using a blend of poly（9,9-dioctylttuorene）（PFO） and 2-（4-biphenyl）-5-（4-tert-butylphenyl）-1,3,4-oxadiazole （PBD） as a host matrix exhibited a maximum luminance efficiency of 11.3 cd/A at 17. 6 mA/cm^2. In contrast, the devices using a blend of poly（N-vinylcarbazole） （PVK） and PBD as a host matrix reveal only a peak luminance efficiency of 6.Scd/A at 4.1 mA/cm^2. The significantly enhanced electrophosphorescent emissions are observed in the devices with the PFO-PBD blend as a host matrix. This indicates that choice of polymers in the host matrices is crucial to achieve highly efficient phosphorescent dye-doped PLEDs.     

一种基于环金属铱配合物的高效绿色聚合物电致发光器件

以2-苯基吡啶为主配体,3-乙酰基樟脑为辅助配体合成了一种新型的具有大空间位阻的环金属铱配合物Ir[(PPy)2(acam)],对它的化学结构和光物理性质进行了表征.以环金属铱配合物Ir[(PPy)2(acac)]的发光效率(0.34)为参照物,配合物在2-甲基四氢呋喃溶液中的光致发光效率为0.54,表明在配合物中引入...     

D-A型环金属铱(Ⅲ)配合物磷光材料的合成及其光电性能的研究

为获得非共轭连接的供体(D)与受体(A)结构对环金属配合物的光电性能影响的关系,设计合成了一类新型的基于咔唑和嚼二唑功能基的D-A型环金属铱配合物,并研究了这类材料的光电性能.研究结果显示:这类磷光材料与母体化合物二[2-(4',6'-二氟苯基)吡啶-C2,N'](吡啶-2-甲酸)合铱(Ⅲ)[(dfppy)2Ir(pi...