Green-Emitting Poly[(2-alkoxy-5-methyl-1,3-phenylenevinylene)-<i>a</i><i>lt</i>-(1,4-phenylenevinylene)s: Effect of Substitution Patterns on the Optical Properties
作者:Liang Liao、Yi Pang、Liming Ding、Frank E. Karasz
DOI:10.1021/ma012178r
日期:2002.5.1
was about 20 nm blue-shifted from that of poly[(1,3-phenylenevinylene)-alt-(2,5-dialkoxy-1,4-phenylenevinylene)]s (1), although the chromophores in the former had the same number of alkoxy substituents as in the latter. Comparison of 2 with the model compound 7 showed that the shorter conjugation length observed from 2 (relative to 1) was the intrinsic property of the chromophore. Polymer 2 also exhibited
通过Wittig-Horner反应合成了发绿色光的聚[(2-烷氧基-5-甲基-1,3-亚苯基亚乙烯基)-alt-(1,4-亚苯基亚乙烯基)] s(2)。聚合物是分子量高达54 600的黄色树脂。基于FT-IR和1 H NMR光谱,证实聚合物中的烯烃主要为反式构型。紫外-可见吸收2(λ最大≈374 - 377纳米)为约20nm的蓝移从聚[(1,3-亚苯基亚乙烯基) - ALT - (2,5-二烷氧基-1,4-亚苯基亚乙烯基) ] s(1),尽管前者中的生色团具有与后者中相同数目的烷氧基取代基。比较2用模型化合物7得到的化合物显示,从2(相对于1)观察到的较短的缀合长度是发色团的固有性质。聚合物2也显示出比更高的光致发光(PL)1在溶液和膜状态,表示取代模式的对聚合物的光学性能的影响。通过低温紫外可见光谱和荧光光谱确定了振动的结构。使用LED装置2得到绿色EL输出(发射λ最大在496和520纳米),用0