STUDY ON LIQUID CRYSTALLINITY OF POLY(N-VINYLCARBAZOLE)

The liquid crystallinity of poly(N-vinylcarbazole) was studied by using powder X-ray diffraction, polarized opticalmicroscopy, and differential scanning calorimetry. The results show that the lower molecular weight fractions of this polymerdo not form a liquid crystalline phase, while the samples of sufficiently high molecular weight do form a mesophase attemperatures above the glass transition. The lowest value of the degree of polymerization for PVK to form a stable liquid crystalline phase was found to be in the range of 150 to 200,significantly higher than the value of 50 for most conventional side chain liquid crystalline polymers.     

主链含电子传输型团的可溶性PPV聚合物载流子传输特性研究

合成了一种聚苯撑乙烯撑(PPV)主链上含有电子传输基团的新型结构电子聚合物(O-PPV).该低聚物的M_w=1000,T_g=197℃,可溶于氯仿和四氢呋喃.单层O-PPV器件的发光效率约为单层PPV器件的5～8倍.进一步构造了结构为空穴传输特性材料/O-PPV和O-PPV/电子传输特性材料的双层器件来研究O-PPV的载流子传输特性,实验结果表明,O-PPV是一种具有明显两性载流子传输的特性材料.     

C_（60）－PNVC共聚物在溶液中的电化学行为

Ｃ_（６０）－ＰＮＶＣ共聚物在溶液中的电化学行为陈,黄祖思,蔡瑞芳,章福平（复旦大学化学系,上海２００４３３）Ｃ６０球状分子内外表面有６０个π电子,组成三维π电子共轭体系,具有很强的三阶非线性、电子亲和力（２．６～２．８ｅＶ）和还原性。可作为优良的电?..     

STRUCTURE AND PROPERTIES OF POLY (N-VINYLCARBAZOLE) OBTAINED VIA ASYMMETRICALLY STEREOSELECTIVE POLYMERIZATION

The structure and properties of poly(N-vinylcarbazole) (PVCZ) obtainedvia asymmetrically stereoselective polymerization have been studied by using ~1HNMRspectra, UV spectra, DSC analysis and GPC. The steric microstructure i.e. the contentof isotactic sequences was found to be increased by using AIBN to (-)Sp~+(+)CSA~- asthe initiators or catalysts and the mole extinction coefficient to be decreased. Bimodalmolecular weight distribution (MWD)s of the obtained PVCZs were caused by two propa-gating species of the free ions and the ion-pairs associated with the organic salts duringpolymerization.     

POLYMERIZATION MECHANISM OF N-VINYLCARBAZOLE WITH CHIRALLY ORGANIC SALT AS CATALYST

The polymerization mechanism is described by the conductance changewith the time during the polymerization. The mechanism can be explained by the equi-librium feature (i.e. main ion-pairs) between the free ions and the ion-pairs dissociated bythe organic salt (-) Sp*+ (+) CSA*- (An asterisk represents the chirality) and the schemeof the polymerization process is described mainly by the charge transfer complexes havingchiral induction power.     

Plasma-polymerized carbon disulfide films as a hole transport layer in organic electroluminescent devices

Electroluminescent devices were fabricated using plasma-polymerized carbon disulfide films, poly(CS₂), and tris(8-quinolinolato)aluminum(III) complex, Alq, as the hole transport layer and the emitting layer, respectively. A cell structure of glass substrate/indium–tin–oxide/poly(CS₂/Alq/Mg/Ag) was employed. Smooth hole injection from the electrode through the poly(CS₂) layer and concomitant electroluminescence from the Alq layer were observed. Green emission with a luminance of 250 cd/m² was achieved at a drive voltage of 14 V.     

The Electroluminescence Characterization of Poly(p-phenyleneethynylene)——The π-conjugated Backbone Interrupted by a Butylene Unit

IntroductionSince the firstreport in1 990 of the electro- lu-minescence of the conjugated polymers in the filmof poly(p- phenylenevinylene) sandwiched betweenan anode and a cathode of appropriate work func-tions[1] ,enormous efforts have been devoted to thesynthesis of light emitting polymers[2— 4 ] .Owing toconjugated polymers′ photoluminescence and elec-troluminescence having been found out,their im-portant properties,polymer processability,bandgap tunability and mechanical flexibility mak…     

C_（60）化学修饰的PNVC材料的UV－VIS谱研究

本实验采用金属有机化学方法成功地将富勒烯分子引入到ＰＮＶＣ侧链形成ＣＢＰ（ＣｈａｒｍＢｒａｃｅｌｅｔＰｏｌｙｍｅｒ）型共聚功能材料，研究了其ＵＶ－ＶＩｓ谱行为。结果表明，Ｃ_（６０）或Ｃ_（６０）／Ｃ_（７０）混合物化学修饰的产物其紫外可见谱明显向长波方向移动，谱峰范围由２８０ｎｍ扩展至８７０ｎｍ。Ｃ_（６０）含量增加，红移程度增大，在可见区域的吸收程度亦增加。产物主要存在５个特征峰，分别位于２１５ｎｍ、２６５ｎｍ、２９８ｎｍ、３３５ｎｍ、３４５ｎｍ处，其中２１５ｎｍ峰为Ｃ_（６０）仅存的特征峰。最后讨论了不同合成条件与产物硝化处理对其ＵＶ－ＶＩＳ谱行为的影响。     

主链含噁二唑的离子传导型聚对苯乙炔衍生物的合成及发光性能

通过共聚合将噁二唑结构单元引入苯乙炔(PPV)主链,以改进电子注入与传输性能;用离子传导型的聚氧乙烯(PEO)链作为高分子的侧链.用该种聚合物制作的发光二极管(LED)与不含噁二唑的同类结构的共轭聚合物相比,性能明显提高,并制作了发光电池(LEC),对其性能进行初步研究.     

抗菌医药左氧氟沙星在有机电致发光二极管中的应用

左氧氟沙星(LOFX)是一种知名的抗菌药物, 它的价格非常便宜, 且有成熟的合成和纯化技术. 本文中首次将LOFX作为一种蓝光发光材料和电子传输材料应用于有机电致发光器件(OLED)中. 通过热重分析、UVVis吸收光谱、发射光谱以及循环伏安曲线详细地表征了LOFX的热学及光物理特性. LOFX有高的分解温度,为327 ℃; HOMO、LUMO能级分别为-6.2 和-3.2 eV, 光学带隙为3.0 eV. 以LOFX作为客体材料, 掺杂在主体材料4,4'-二(9-咔唑)联苯(CBP)中制备了蓝光OLED, 该器件的电致发光(EL)发射峰位于452 nm, 最大亮度为2315 cd·m^-2. 进一步, 选择8-羟基喹啉铝(Alq₃)作为参考材料, 分别以LOFX和Alq₃作为电子传输材料制备了结构相同的单载流子器件和绿色磷光OLED. 在相同的电压下, 以LOFX作为电子传输材料的单载流子器件的电流密度比以Alq₃作为电子传输材料的单载流子器件更高. 同时, 以LOFX作为电子传输材料的绿色磷光OLED获得更高的器件效率. 从这些EL性能可以看出, LOFX同时也是一很好的电子传输材料.     

Comparative study of photoelectric properties of a copolymer and the corresponding homopolymers based on poly(3-alkylthiophene)s

As semiconducting materials in organic light-emitting devices (OLEDs), a novel, highly soluble poly[(3-octylthiophene)-co-(3-(2-ethyl-1-hexylthiophene))] (P3OTIOT) and the corresponding homopolymers (poly(3-octylthiophene) (P3OT) and poly(3-isooctylthiophene) (P3IOT)) were prepared by an FeCl₃-oxidative approach to compare their photoelectric properties. Characterization of the polymers included FT-IR, ¹H NMR, gel permeation chromatography (GPC), thermo-gravimetric analysis (TGA), UV-vis spectroscopy, photoluminescence (PL) and electroluminescence (EL). P3OTIOT and P3OT depicted excellent solubility in common organic solvents. TGA studies showed that all of the materials exhibited very good thermal stabilities, losing 5% of their weight on heating to 300 °C. The optical property investigations showed that the band-gap energy of P3OTIOT was similar to that of P3OT (2.43 eV) at 2.45 eV and 6% lower than that of P3IOT (2.6 eV) in CHCl₃ solution. In PL spectra, the emission maxima of P3OTIOT and P3IOT were 50 nm and 130 nm blue-shifted with respect to that of P3OT, respectively. However, the PL intensity of P3OTIOT was seven times higher than that of P3OT. Single layer polymer light-emitting devices (PLEDs) with the ITO/polymer/Ag configurations were fabricated by the spin-coating method with P3OT, P3IOT and P3OTIOT as the EL materials, which exhibited red (650 nm), orange-red (610 nm) and yellow-green (525 nm) EL, respectively. The external EL quantum efficiencies (QE) of P3IOT and P3OTIOT devices are 6.4 × 10⁻³% and 5.1 × 10⁻³% which are about five and four times higher than that of the P3OT device (1.2 × 10⁻³%), respectively. The turn-on voltage of the P3OTIOT device (5 V) is between that of the P3OT (4.5 V) and P3IOT (6 V) devices. These results indicated that the P3OTIOT combined the photoelectric properties of P3OT and P3IOT with excellent solubility, processability, low band-gap energy, high QE and low turn-on voltage in the PLEDs, and they might be excellent polymeric materials for applications in organic light-emitting diodes, light-emitting electrochemical cells and polymer solar cells.     

High-efficiency,solution-processable,multilayer triple cation perovskite light-emitting diodes with copper sulfide–gallium–tin oxide hole transport layer and aluminum-zinc oxide–doped cesium electron injection layer

Light-emitting diodes with perovskite luminophores have great potential in next-generation displays because of their exceptional color purity with narrow emission bandwidth, broadband color tunability, and solution processability. However, their low luminescent efficiency is a critical drawback. Here, we report the first demonstration of a multicolor, large-area, perovskite display, which can be made flexible by using an optimized perovskite emissive layer sandwiched between inorganic metal oxide charge transport layers, all of which are coated via a facile solution process. We show that advanced interfacial engineering, especially the energy level alignment at the interface, plays a vital role in determining the device performance because of its effects on charge injection, transport, and recombination. These devices exhibit maximum current and power efficiencies of 74.25 cd A^?1 and 89.72 lm/w for green emission, 21.40 cd A^?1 and 25.84 lm/w for red emission, and 15.21 cd A^?1 and 15.84 lm/w for blue emission, respectively. Furthermore, with the introduction of inorganic charge transport layers, these devices exhibit high environmental stability, and the encapsulated devices have operating lifetimes exceeding 450 h with an initial brightness of 1000 cd/m².     

含1，3，4-NFDA1二唑环系的电致发光材料的研究进展

1 ,3,4 二唑环系是一个缺电子的基团和很弱的空穴接受体 ,含有 1 ,3,4 二唑单元的化合物是一类具有良好电子传输功能的电致发光材料。本文对含有 1 ,3,4 二唑单元的有机小分子和高分子型电致发光材料的近期进展作了综述 ,而且在这类材料的分子设计方面也作了简要的展望     

烷基芴与三苯胺取代-3,6-芴共聚物的合成及其性能

用Suzuki偶联反应制备了一系列新型的9,9-二辛基-2,7-芴(DOF)与9,9-二(4-二苯胺基苯基)-3,6-芴(36FT)的共聚物. 所有的聚合物均可溶于常见的有机溶剂(如THF, CHCl3和甲苯等), 分子量在47000~189000之间. 电化学研究结果表明, 所有聚合物的HOMO能级都高于均聚烷基芴, 并且随着36FT含量的增加, HOMO值逐渐上升. 以该类聚合物为发光层制作了结构为ITO/PEDOT/PVK/polymer/Ba/Al的器件, 获得了稳定的蓝光发射, 其中以36PFT10为发光层的器件获得了0.52%的最大外量子效率.