Synthesis and electrochemical and electroluminescent properties of N-phenylcarbazole-substituted poly(p-phenylenevinylene)
Synthesis and electrochemical and electroluminescent properties of N-phenylcarbazole-substituted poly(p-phenylenevinylene)
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DOI：
10.1002/pola.21018
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
F. Liang;Takashi Kurata;H. Nishide;J. Kido
中科院分区：
文献类型：
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作者：
F. Liang;Takashi Kurata;H. Nishide;J. Kido
合成了一种含N-苯基咔唑的聚对苯撑乙烯（PPV），即聚[（2-（4′-咔唑-9-基-苯基）-5-辛氧基-1，4-苯撑乙烯）-alt-（2-（2′-乙基己氧基）-5-甲氧基-1，4-苯撑乙烯）]（Cz-PPV），并研究了其光学、电化学和电致发光性能。对关键中间体咔唑硼酸酯和二醛单体的分子结构进行了晶体学表征。该聚合物可溶于普通有机溶剂中，并表现出良好的热稳定性，在氮气中在高于420 °C的温度下重量损失5%。循环伏安图显示了咔唑侧基和PPV主链的氧化峰电位，表明咔唑官能团的引入提高了聚合物的空穴注入能力。具有氧化铟锡（ITO）/Cz-PPV（80 nm）/Ca/Al的简单构造的单层发光二极管（LED）在11 V的偏压和565 mA/cm 2的电流密度下呈现亮度为1560 cd/m2的亮黄色发光。具有ITO/聚（3，4-亚乙二氧基-2，5-噻吩）：聚（苯乙烯磺酸）（60 nm）/Cz-PPV（80 nm）/Ca/Al的配置的双层LED器件在3 V下给出低开启电压，并且在8 V的偏压下给出6600 cd/m2的最大亮度。对应于双层器件的最大电致发光效率为1.15 cd/A、0.42 lm/W和0.5%。所需的电致发光结果表明，引入空穴传输功能团的PPV是有效的，以提高电致发光性能。© 2005 Wiley Periodicals，Inc.聚合物科学杂志A部分：聚合物化学43：5765-5773，2005年
An N-phenylcarbazole-containing poly(p-phenylenevinylene) (PPV), poly[(2-(4′-carbazol-9-yl-phenyl)-5-octyloxy-1,4-phenylenevinylene)-alt-(2-(2′-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene)] (Cz-PPV), was synthesized, and its optical, electrochemical, and electroluminescent properties were studied. The molecular structures of the key intermediates, the carbazole-containing boronic ester and the dialdehyde monomer, were crystallographically characterized. The polymer was soluble in common organic solvents and exhibited good thermal stability with a 5% weight loss at temperatures above 420 °C in nitrogen. A cyclic voltammogram showed the oxidation peak potentials of both the pendant carbazole group and the PPV main chain, indicating that the hole-injection ability of the polymer would be improved by the introduction of the carbazole-functional group. A single-layer light-emitting diode (LED) with a simple configuration of indium tin oxide (ITO)/Cz-PPV (80 nm)/Ca/Al exhibited a bright yellow emission with a brightness of 1560 cd/m2 at a bias of 11 V and a current density of 565 mA/cm2. A double-layer LED device with the configuration of ITO/poly(3,4-ethylenedioxy-2,5-thiophene):poly (styrenesulfonic acid) (60 nm)/Cz-PPV (80 nm)/Ca/Al gave a low turn-on voltage at 3 V and a maximum brightness of 6600 cd/m2 at a bias of 8 V. The maximum electroluminescent efficiency corresponding to the double-layer device was 1.15 cd/A, 0.42 lm/W, and 0.5%. The desired electroluminescence results demonstrated that the incorporation of hole-transporting functional groups into the PPVs was effective for enhancing the electroluminescent performance. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5765–5773, 2005