含空穴传输基团PPV的合成与性能研究

该论文以提高聚苯撑乙烯（PPV）类发光聚合物的空穴传输性能为主要目的,通过将具有较高空穴传输能力的芳胺类小分子基元引入发光聚合物分子链,设计并合成了一系列含芳胺基元的PPV聚合物.另外,还通过对分子结构进行设计和控制,获得了红绿蓝三基色发光.最后还利用在共轭分子主链上引入具有三维空间位阻的侧链基团,获得了高效率的绿色发光聚合物材料.

PPV齐聚物为基元的发光材料的合成与性能研究

PPV齐聚物（OPV）因为具有确定的发光结构，高的发光效率，和光电活性，被广泛的关注。本论文本围绕PPV齐聚物（OPV）展开研究。设计合成了有机／无机杂化型和热交联型高分子发光材料，解决了制作多层器件过程中，旋涂时下面的薄膜容易被溶解的问题。我们设计合成了一系列能量转移和传输平衡型高分子发光材料，并对材料进行了优化。1、利用末端带活性双酚的OPV与二甲基二苯胺基硅烷通过熔融缩聚反应，合成出以硅氧烷为嵌段单元的发光聚合物，并通过调节OPV单体上的取代基团实现聚合物的蓝光发射。2、在PPV的末端引入可交联的苯乙烯基元，在高温下实现PPV的交联，得到了耐溶剂的PPV薄膜，利用其耐溶剂的特点用简单的旋涂的方法制备了双层器件，与单层器件相比效率提高了约13倍，器件的最大亮度达7O0cd／m2。3、通过化学修饰在OPV的两端引入了活性的三乙氧基硅烷，利用三乙氧基硅的反应活性，将OPV通过Sol-Gd的方法固定到SiO2的基质中，OPV与基质之间的作用为化学键，这样有效的减少了OPV在基质中的聚集。同时我们制备了PMMA与OPV通过物理共混得到的Si-OPV/PMMA薄膜和不带活性基团的Me-OPV，通过Sol-Gel制备了Me-OPV／SiO2薄膜，结果表明，采用物理掺杂时，客体OPV在主体中存在明显的聚集；经过热处理后只有化学掺杂的薄膜形态和光谱仍然保持稳定。4、将两种不同的OPV发光单元通过稳定的芳醚键连接，得到了热稳性的聚合物，由于不同的发光单元之间的吸收和发射光谱存在重叠，我们观察到分子内的能量转移现象，通过能量转移提高了聚合物在薄膜和溶液下的量子效率和相应的电致发光效率。5、为了改善PPV类能量转移型发光分子的传输特性，通过Wittig反应在聚合物主链中引入了电子传输单元：噁二唑，三唑。为了优化材料我们调节了传输单元在主链中的含量，通过器件数据优化出电子传输基元在主链中的最佳含量。使得优化后的材料的器件效率比未引入传输单元的提高了10倍以上，最大亮度达到1300cd／m2。

High PL-efficiency ZnO nanocrystallites/PPV composite nanofibers

In this paper, we report for the first time on the synthesis of ZnO nanocrystallites in conjugated polymer (PPV) nanofibers by the coupling of the in situ/blend methods and electrospinning. These composite nanofibers were characterized by fluorescence microscopy, atomic force microscope (AFM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectra, Fourier transform infrared (FT-IR) spectroscopy, and X-ray powder diffraction (XRD).

Synthesis, characterization, and electroluminescence of PPV copolymers containing electron and hole-transporting units

Three series of poly(phenylene vinylene) (PPV) derivatives containing hole-transporting triphenylamine derivatives [N-(4-octoxylphenyl)diphenylamine, N,N'-di(4-octyloxylphenyl)-N,N'-diphenyl-1,4-phenylenediamine, and N,N'-di(4-octoxylphenyl)-N,N'-diphenylbenzidine] (donor) and electron-transporting oxadiazole unit (2,5-diphenyl-1,3,4-oxadiazole) (acceptor) in the main chain were synthesized by improved Wittig copolymerization. The resulting donor-acceptor (D-A) polymers are readily soluble in common organic solvents, such as chloroform, dichloroethane, THF, and toluene.

Novel PPV-based light-emitting copolymers containing triazole moiety

Two new light-emitting PPV-based copolymers bearing electron-withdrawing triazole unit in the main chain have been synthesized by Wittig reaction between triazole diphosphonium salt and the corresponding dialdehyde monomers, respectively. Their optical and physical properties are characterized by UV-vis, photoluminescence (PL), TGA and DSC. The resulting copolymers are highly soluble in common organic solvents and have high Tg and Td values. They show blue-greenish fluorescence in solution (lambda(max) 502 and 508 nm) and green fluorescence in the solid state (lambda(max) 520 and 526 nm), respectively.

Novel PPV-based light-emitting polymers containing siloxane moiety

Two PPV-based copolymers consisting siloxane linkage have been synthesized by melt condensation of bisphenol and dianilinodimethylsilane. The rigid PPV segments act as chromosphere and allow fine turning of band gap for blue-light emission, while the flexible siloxane units lead to the effective interruption of conjugation and the enhancement of solubility. The UV-vis absorption, photoluminescent and eletroluminescent properties have been studied.

Improved efficiency of PPV due to bulky tetraphenylmethane pendants

A PPV derivative containing bulky tetraphenylmethane side chains was synthesised. Its optical properties were examined. Compared to its parent PPV polymer, its UV-Vis absorption and PL showed less red-shift from solution to film, its PL showed much less concentration quenching effect and higher efficiency, its EL device showed 9-fold enhanced efficiency. These improvements were attributed to weakened inter-chain interaction caused by the tetraphenylmethane group.

New PPV oligomers containing 8-substituted quinoline for light-emitting diodes

Two new poly(phenylenevinylene) (PPV) oligomers, 2,2'-(1,4-phenylenedivinylene)bis-8-acetoxy quinolines were synthesized via a Knoevenagel condensation reaction. The single-crystal X-ray diffraction study shows that there are intermolecular pi...pi interactions in the solid state of 2,2'(1,4-phenylenedivinylene)bis-8-acetoxyquinoline. Electroluminescent properties using these compounds as emitters have been investigated.

Novel blue light-emitting PPV-based copolymer containing triazole and carbazole units

A novel alternating conjugated copolymer containing triazole and carbazole units was synthesized by the Wittig reaction. The resulting bipolar conjugated polymer emits a pure light with good thermal stability, which is a promising candidate for polymer light emitting display.

共轭主链结构三苯胺PPV聚合物发光二极管

报道了一种共轭主链结构三苯胺PPV聚合物发光二极管,器件结构ITO/ploymer/Alq_3/Mg:Ag/Ag。在20V驱动电压下,最大亮度达到了1000cd/m~2

Stimulated emission in the blue wavelength region from a copolymer containing PPV segment

The lasing properties of a soluble conjugated polymer, Poly[1,8-octanedioxy-2,6-dimethoxy-1,4-phenylene-1,2-ethenylene-1,2-phenylene-1,2-ethenylene-3,5-dimethoxy-1,4-phenylene] (CNMBC-Ph) in chloroform solution were investigated. The third harmonic radiation of a Nd:YAG laser was used as the pump light. The stimulated emission with a linewidth of 15 nm was observed in the blue wavelength region with the peak at 450 nm. The threshold pulse peak power was about 2.8 MW/cm(2). The energy conversion yield of the laser was estimated to be about 3.4%. The maximum peak power of the laser output pulse reached 40 kW. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

Synthesis and characterization of novel bipolar PPV-based copolymer containing triazole and carbazole units

Two new blue light-emitting PPV-based conjugated copolymers containing both an electron-withdrawing unit (triazole-TAZ) and electron-rich moieties (carbazole-CAR and bicarbazole-BCAR) were prepared by Wittig condensation polymerization between the triazole diphosphonium salt and the corresponding dialdehyde monomers. Their structures and properties were characterized by FT-IR, TGA, DSC, UV-Vis, PL spectroscopy and electrochemical measurements. The resulting copolymers are soluble in common organic solvents and thermally stable with a T-g of 147degreesC for TAZ-CAR-PPV and of 157degreesC for TAZ-BCAR-PPV. The maximum photoluminescence wavelengths of TAZ-CAR-PPV and TAZ-BCAR-PPV film appear at 460 nm and 480 nm, respectively. Cyclic voltammetry measurement demonstrates that TAZ-BCAR-PPV has good electrochemical reversibility, while TAZ-CAR-PPV exhibits the irreversible redox process. The triazole unit was found to be an effective pi-conjugation interrupter and can play the rigid spacer role in determining the emission colour of the resulting copolymer.

Synthesis and properties of alternating copolymers containing PPV and hole-transporting units for light-emitting devices

A series of alternating copolymers containing triphenylamine (TPA) moieties and oligomeric PPV segments in the main chain have been synthesized by Wittig condensation. The resulting polymers exhibit good thermal stability with decomposition temperatures (Tds) above 305 degreesC under nitrogen at 10 degreesC/min, and high glass transition temperatures (Tgs). They show intense photoluminescence in solution and film. The single-layer electroluminescent device using TAA-PV1 as emissive layer emits green light at 522nm with a turn-on voltage of 6V and maximum brightness of about 200cd/m(2) at 20V.