不对称烷氧基取代聚对苯乙炔的合成及电致发光性能

利用强碱诱导的去卤缩合聚合法，合成了不对称烷氧基取代的聚（２－甲氧基－５－十二烷氧基－１，４－对苯乙炔）（ＰＭＤＰＶ）．其溶解性和成膜性能优于对称取代的聚（２，５－双十二烷氧基－１，４－对苯乙炔）．以ＰＭＤＰＶ为发光层质的聚合物电致发光器件，其发光峰值波长为６０５ｎｍ．并用ＩＲ、ＵＶ－Ｖｉｓ、ＴＧＡ、１ＨＮＭＲ、ＧＰＣ等对所合成的聚合物进行了表征．     

聚对苯乙炔-噻吩共轭聚合物电致发光性能的研究

1990年剑桥大学的Ｂｕｒｒｏｎｇｈｅｓ[1] 等首次提出用共轭高分子聚 (苯乙撑 ) (ＰＰＶ)为发光层材料制备了聚合物电致发光器件 ,不久Ｈｅｅｇｅｒ[2 ] 等证实了这个结果 ,随后发光聚合物的研究在世界范围内广泛开展起来 ,ＰＰＶ目前已被证实是一个潜在的电致发光材料[3 ] .共轭聚合物用于电致发光有以下特点 :( 1 )可通过旋涂、浇铸等方法制成大面积薄膜 ;( 2 )共轭聚合物大多有优良的稳定性 ;( 3)共轭聚合物电子结构 ,发光颜色能够通过化学结构的改变和修饰进行调节 ;( 4 )聚合物做发光层时可制成非常薄的膜 ( 1 0～ 1 0 0ｎｍ) ,可消除…     

主链含电子传输型基团的可溶性PPV发光特性研究

经由Ｗｉｔｉｇ－Ｈｏｒｎｅｒ反应合成了一种可溶的ＰＰＶ主链含有电子传输基团的新型结构电子聚合物。该低聚物的Ｍｗ＝１０００、Ｔｄ＝２７０℃,可溶于氯仿和四氢呋喃。构造了最简单的三明治式电致发光器件ＩＴＯ／Ｏ－ＰＰＶ（８０ｎｍ）／Ａｌ,其电致发光和光致发光光谱基本一致。该器件与同样结构的ＰＰＶ相比其ＥＬ表现出在５０９ｎｍ处单一的宽峰,而ＰＰＶ的器件为５２０ｎｍ和５５０ｎｍ的双峰。另外由于主链上含有电子传输特性的二唑基团及聚合物材料的分子量较小,器件的量子效率达到０．１３％,是同样结构器件ＰＰＶ量子效率的五倍     

一种合成聚(2-甲氧基-5-(2′-乙基-己氧基)-对苯乙炔)的新方法

聚对苯乙炔 (ＰＰＶ)及其衍生物是制备聚合物发光二极管的最重要的聚合物之一[1] .这主要是因为它们具有优越的电致发光性能 ,易于合成以及良好的环境稳定性[2 ] .而聚 (2 甲氧基 5 (2′ 乙基 己氧基 ) 对苯乙炔 ) (ＭＥＨ ＰＰＶ)由于其可溶性好 ,发光效率和亮度高 ,在电致发光领域广受关注 .现在有许多ＭＥＨ ＰＰＶ的多步化学合成方法以及电化学合成方法 .但是 ,这些方法常常产率低 ,成本高且产品不纯 .本文报道一种固 液两相反应一步合成分子量大、溶解性好的ＭＥＨ ＰＰＶ的新方法 .1　主要原料对甲氧基苯酚 (纯度≥ 98% ,Ａｌｄｒ…     

聚合物电致发光材料研究进展

本文较详细地综述了聚合物电致发光材料的研究进展，重点介绍了聚对苯撑乙烯（ＰＰＶ），并提出了有关聚合物电致发光材料及器件构造研究的一些观点。     

含1,1-二（4-（N,N-二甲基胺基）苯基）-2,3,4,5-四苯基噻咯的聚合物在三种阴极结构中的电致发光性能

设计合成了一种1,1-位为二（4-（N,N-二甲基胺基）苯基的新型噻咯单体,并与2,7-芴单体聚合得到六苯基噻咯单体投料量为1%、10%、20%的三种共聚物PF-N-HPS1～20.研究了这些共聚物的紫外吸收光谱、电化学性质、光致发光光谱和电致发光性能.PF-N-HPS的HOMO能级为5.25～5.58eV,呈现绿光发射.以PF-N-HPS为发光层,制作了三种聚合物发光二极管（器件结构A：ITO/PEDOT/PF-N-HPS/Al;器件结构B：ITO/PEDOT/PF-N-HPS/Ba/Al;器件结构C：ITO/PEDOT/PF-N-HPS/TPBI/Ba/Al）.其中器件结构A的电致发光效率仅为0.1～0.33cd/A,说明PF-N-HPS中的4-（N,N-二甲基胺基）苯基结构不能使单独的Al阴极实现良好的电子注入.采用了低功函金属Ba阴极的器件结构B能改善电子的注入,使电致发光效率提高到0.85～1.44cd/A.器件结构C采用TPBI（HOMO：6.2eV）作为电子传输和空穴阻挡层,促进了电子和空穴的有效复合,进一步提高了电致发光效率（4.56～7.96cd/A）,其中TPBI层将噻咯聚合物与金属阴极隔离可能减少发光层在阴极界面处的激子猝灭也起到了一定的作用,器件结构C较器件结构B还获得了更好的绿光光谱.     

去卤缩聚法合成蓝色电致发光聚合物聚（2,5—二庚基）对苯乙炔

利用双卤甲基苯衍生物在强碱诱导下的缩合反应，合成了共轭态可溶的聚对苯乙炔，并利用ＩＲ，ＵＶ－Ｖｉｓ，＾１Ｈ－ＮＭＲ，ＴＧＡ等对聚合物结构与性能进行了有征，其Ｎｎ＝０．４８×１０＾４。电致发光器件的发光峰值波长为４８６ｎｍ，起亮电压为２２Ｖ。     

3-辛基噻吩的质谱分析

共轭聚合物通常具有一些独特的物理性质,如高的电导率、电致发光、电致变色、非线性光学性质等。这类共轭聚合物包括聚苯胺、聚噻吩、聚吡咯、聚对苯乙炔、聚对苯等。自英国剑桥大学的Burrougs等人[1]采用聚对苯乙炔成功地制备了第一个聚合物电致发光器件以来,对聚合物电致发光     

一种新型苯乙烯衍生物的光致发光与电致发光

对一种新型苯乙烯衍生物的光致发光和电致发光进行了研究。１－９－蒽基－４－氯甲基－２,５－二甲氧基苯的溶液随浓度的增大,其单体荧光逐渐减弱而激基复合物发光逐渐增强。在薄膜状态只有激基复合物荧光,表明在溶液和薄膜状态下均存在单体向激基复合物的能量转移过程,用分子间距离越近,能量转移效率越高。以该化合物制成的单层二极管器件,其电致发光光谱随电压增强从激基复合物发光逐渐转变为激复合发光。     

N-苯基咔唑取代的蓝光聚(2,7-咔唑)的合成与表征

采用Suzuki聚合方法并通过改变催化剂的投料量,合成了一系列具有不同分子量的N-苯基咔唑取代的蓝光聚(2,7-咔唑),并详细研究了分子量对聚合物的光物理、电化学和电致发光器件性质的影响.结果表明,刚性N-苯基咔唑侧链的引入,能够有效地调控主链之间的相互作用,提高蓝光的色纯度,并使得该系列聚合物的固态荧光量子效率高达0.40.同时,在热退火及器件工作过程中,没有观察到类似聚芴中绿光峰的出现,表明具有良好的光谱稳定性.单层聚合物电致发光器件的最大发光效率为0.33 cd/A,色坐标为(0.18,0.12).     

High‐efficiency organic electroluminescent devices using iridium complex emitter and arylamine‐containing polymer buffer layer

We have developed efficient organic electroluminescent (EL) devices using a phosphorescent material, tris(2‐phenylpyridine) iridium, Ir(ppy)₃, as an emitter material and a polymer buffer layer, tetraphenyldiamine‐containing poly(arylene ether sulfone) (PTPDES) doped with tris(4‐bromophenyl) aminium hexachloroantimonate (TBPAH) as an electron acceptor. In this device, a high external quantum efficiency of 21.6% and a luminous efficiency of 82 lm/W (77 cd/A) at 3.0 V were obtained. These high efficiencies can be explained by high quantum efficiency due to phosphorescent Ir(ppy)₃ and high luminous efficiency realized by the use of the polymer buffer layer. Copyright © 2002 John Wiley & Sons, Ltd.     

Synthesis of an electroluminescent polymer and its non‐doped light‐emitting diodes with stable green emission

An electroluminescent polymer was synthesized by Wittig condensation and characterized by the measurements of ¹H‐NMR, IR, gel permeation chromatography (GPC), UV–Vis, PL, and cyclic voltammetry (CV). The polymer can be dissolved in common organic solvents such as tetrahydrofuran (THF), chloroform, and dichloromethane. The electroluminescent investigation showed that the non‐doped devices with a double‐layer configuration (ITO/PEDOT:PSS/Polymer/Mg:Ag) have a stable green emission property. The maximum luminance of the annealed device reaches 2317 cd/m². The emission maximum and the CIE 1931 coordinate values are respectively stabilized at 552 nm and near (x, y) = (0.43, 0.55) with different voltages. Copyright © 2008 John Wiley & Sons, Ltd.     

Organic electroluminescent device with aromatic amine-containing polymer as a hole transport layer (II): Poly(arylene ether sulfone)-containing tetraphenylbenzidine

Organic electroluminescent devices were fabricated using a poly(arylene ether sulfone)-containing tetraphenylbenzidine (PTPDES) and tris(8-quinolinolato)-aluminum(III) complex, Alq, as the hole transport layer and the electron-transporting emitter layer, respectively. A device structure of glass substrate/indium—tin oxide (ITO)/PTPDES/Alq/Mg : Ag was employed. Hole injection from ITO through the PTPDES layer to the Alq layer and concomitant electroluminescence from the Alq layer were observed. Bright green light with a luminance of 14,000 cd/m² was observed at a drive voltage of 14 V, indicating that the polymer possesses a high hole mobility and a high electron-blocking capability.     

利用Cs基衍生物作为n型掺杂剂改善蓝色有机发光二极管的效率

利用两种Cs基衍生物碳酸铯(Cs2CO3)和醋酸铯(CH3COOCs)作为n型掺杂剂掺入到一种新型的电子传输材料2,9-二(2-萘基)-4,7-二苯基-1,10-菲啰啉(NBPhen)中来提高有机发光二极管(OLEDs)的效率.实验结果表明:器件的驱动电压明显降低,并且优化后得到的Cs基n型掺杂器件(ITO/β-NPB/CBP:5%(w)N-BDAVBi/NBPhen/NBPhen:Cs2CO3(or CH3COOCs)/Al)呈现出较好的电致发光性能,在14 V时电流密度分别为551.80和527.88 mA·cm-2,对应的亮度分别达到39750和39820 cd·m-2,电流效率在亮度为10000 cd·m-2时分别为14.60 cd·A-1(Cs2CO3掺杂)和14.40 cd·A-1(CH3COOCs掺杂),这些参数明显优于传统器件的发光性能(ITO/β-NPB/CBP:5%(w)N-BDAVBi/NBPhen/Cs2CO3/Al,其在14 V时电流密度为312.39 mA·cm-2,对应的亮度为25190 cd·m-2;电流效率在亮度为10000 cd·m-2时为9.45 cd·A-1.此外,基于有机半导体掺杂原理和器件的能级结构对n型掺杂器件效率提高的原因进行了分析.     

Electroluminescent properties of a partially‐conjugated hyperbranched poly(p‐phenylene vinylene)

In this paper, the electroluminescent properties of a new partially‐conjugated hyperbranched poly (p‐phenylene vinylene) (HPPV) were studied. The single layer light‐emitting device with HPPV as the emitting layer emits blue‐green light at 496 nm, with a luminance of 160 cd/m² at 9 V, a turn‐on voltage of 4.3 V and an electroluminescent efficiency of 0.028 cd/A. By doping an electron‐transport material [2‐(4‐biphenylyl)‐5‐phenyl‐1,3,4‐oxadiazole, PBD] into the emitting layer and inserting a thin layer of tris(8‐hydroxy‐quinoline)aluminum (Alq₃) as electron transporting/hole blocking layer for the devices, the electroluminescent efficiency of 1.42 cd/A and luminance of 1700 cd/m² were achieved. The results demonstrate that the devices with the hyperbranched polymers as emitting material can achieve high efficiency through optimization of device structures. Copyright © 2006 John Wiley & Sons, Ltd.     

Synthesis of a Novel Blue—light—emitting Polymer Material Bearing Coumarin Pendants

A novel blue luminescent polymer bearing coumarin pendants was prepared. Its luminescent properties were determined indicating that it had strong blue fluorescent properies and good film formation ability. This novel polymer can be used as a blue organic electroluminescent material (OELM) in organic electroluminescent devices.     

Syntheses,structures, and electroluminescence of Ln(2)(acac-azain)(4)(mu-acac-azain)(2) [acac-azain = 1-(N-7-azaindolyl)-1,3-butanedionato,Ln = Tb(III) and Y(III)

Two new luminescent lanthanide complexes Ln(2)(acac-azain)(4)(mu-acac-azain)(2) [acac-azain = 1-(N-7-azaindolyl)-1,3-butanedionato, Ln = Tb(III), 1, Y(III), 2] have been synthesized and structurally characterized. These two dinuclear complexes are isostructural with the two lanthanide ions being bridged by two acac-azain ligands. Each of the two metal ions is further chelated by four oxygen atoms from two acac-azain ligands, resulting in a coordination number eight for each metal ion. 1 displays characteristic Tb(III) emission bands while 2 displays weak blue luminescence attributable to the ligand. Single-layer and double-layer electroluminescent devices for compound 1 were fabricated, where compound 1 doped PVK layer functions as both the emitting layer and the hole transport layer and PBD functions as an electron transport layer (in the double-layer device), demonstrating that compound 1 is a promising green emitter in electroluminescent devices.     

新型基于3,6-咔唑与噻吩衍生物的红光聚合物的合成与性能研究

用Suzuki偶合反应制备了一系列N-(2-乙基己基)-3,6-咔唑(Cz)与4,7-二(4-己基噻吩)-2,1,3-苯并噻二唑(DHTBT)的共聚物, 研究该类聚合物的电化学、光学和电致发光性能. 在薄膜状态下, 即使DHTBT含量为1%的聚合物也发生了从Cz链段到DHTBT单元的有效的能量转移. 光致发光光谱随着DHTBT含量的增加, 从645 nm红移至690 nm. PCzDHTBT1获得了71%的薄膜光致发光效率. 以该类聚合物为发光层的器件的EL光谱也随着DHTBT含量的增加从635 nm红移至680 nm. 由PCzDHTBT15制作的结构为ITO/PEDOT:PSS/polymer/Ba/Al的器件得到了0.61%的外量子效率.     

可溶性聚合物电致发光材料PDHPV的合成及单、双层发光二极管器件的发光性能比较

可溶性聚合物电致发光材料ＰＤＨＰＶ的合成及单、双层发光二极管器件的发光性能比较李晨曦，尹春，黄文强，印寿根，张会旗，何炳林，郑军，华玉林（南开大学高分子化学研究所，天津，３０００７１）（天津理工学院材料物理研究所）关键词ＰＤＨＰＶ共轭聚合物；电致发光...     

Synthesis and electroluminescent properties of naphthalimide derivatives

Naphthalimide derivatives, N-ethyl-4-acetylamino-l ,8-naphthalimide (EAAN) and polymer with N-propyl-4-acetylamino-l,8-naphthalimide (PAAN) side-chain (P-PAAN) were successfully synthesized. Electroluminescent devices of ITO/PVK(120nm)/EAAN(50nm)/Al(150nm) (Ⅰ) and ITO/PVK P-PAAN( 10:1) (50nm)/Al(150nm) (Ⅱ) constructed with EAAN and P-PAAN as the emitting layer were investigated, whereas the single-layer devices of ITO/EAAN or P-PAAN(50nm)/Al(l50nm) (Ⅲ) were not observed to have any e-mission light. The emission results revealed that the exciton recombination formed by positive and negative charge carriers injected from electrodes of devices Ⅰ and Ⅱ was much more balanced than that of devices Ⅲ, which implied that naphthalimide derivatives are a new type of electron-transporting materials with high performance. The electron-transporting properties of naphthalimide derivatives were also elucidated by investigation of the electroluminescent behaviors from both devices of ITO/PPV (80nm)/Al and ITO/P