含联苯PPV和柔性间隔基液晶性共轭聚合物的合成与发光性能研究

Synthesis and Light-emitting Properties of Liquid-crystalline Conjugated Polymer Containing Biphenyl-PPVs and Flexible Spacer Segments

通过Wittig反应,合成了主链含有联苯共轭PPV基元及饱和柔性脂肪链间隔基的新型液晶性共轭聚合物,采用FTIR1、H NMR对其结构进行了表征。这种共轭聚合物可溶于三氯甲烷等普通有机溶剂。利用偏光显微镜、热分析和广角X射线衍射对其液晶性进行了研究,结果表明该共轭聚合物为热致性向列型液晶。利用紫外可见光谱和荧光光谱研究了其光致发光性能,结果显示该液晶性共轭聚合物可发射较强的蓝色荧光,固体膜状态下其最大发射峰为460 nm,溶液荧光量子效率为0.36。

A novel liquid-crystalline conjugated polymer containing biphenyl-PPVs and flexible spacer segments is synthesized through the Wittig polycondensation reaction. The conjugated polymer is a thermotropic nematic liquid crystal as revealed by POM, DSC and WAXD. It is soluble in organic solvent such as CHCl3. UV and PL spectra show the polymer emits intensive purple and blue light at solution and film state, respectively. PL spectrum in solid film state shows a maximum emitting peak at about 460 nm, and the quantum yields in CHCl3 solution is 0. 36.