Zhao Zujin, Xu Xinjun, Wang Hongbo, Lu Ping, Yu Gui, Liu Yunqi
Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China.
J Org Chem. 2008 Jan 18;73(2):594-602. doi: 10.1021/jo702075r. Epub 2007 Dec 21.
A series of monodisperse, pyrene-modified oligocarbazoles were synthesized and fully characterized. Carbazoles were linked by ethynylene through the 3- and 6-positions, forming a zigzag molecular backbone and stable, size-independent absorption, and emission were observed from these oligomers in solutions because their conjugation length was confined. Oligomers with pyrene exhibited much higher fluorescence quantum yields than those of oligomers without it. Different positions of pyrene in the oligocarbazole main chain resulted in a remarkable change in absorption and emission spectra. Moreover, devices with four different architectures (types 1-4) based on these oligomers were fabricated and investigated. Pyrene-modified carbazole oligomers exhibited bifunctional properties (light-emitting and hole-transport). Moreover, these devices showed moderate performances; for example,the device based on Cz3PyCz3 presented an external quantum efficiency of 0.69% and a maximum brightness of 1782 cd/m2 at 13.5 V, which indicated these oligomers were promising optoelectric materials.
合成了一系列单分散、芘修饰的低聚咔唑并对其进行了全面表征。咔唑通过乙炔基在3位和6位相连，形成锯齿状分子主链，并且在溶液中观察到这些低聚物具有稳定的、与尺寸无关的吸收和发射，因为它们的共轭长度受到限制。含芘的低聚物比不含芘的低聚物表现出更高的荧光量子产率。芘在低聚咔唑主链中的不同位置导致吸收和发射光谱发生显著变化。此外，基于这些低聚物制造并研究了具有四种不同结构（类型1-4）的器件。芘修饰的咔唑低聚物表现出双功能特性（发光和空穴传输）。此外，这些器件表现出中等性能；例如，基于Cz3PyCz3的器件在13.5 V时的外量子效率为0.69%，最大亮度为1782 cd/m²，这表明这些低聚物是有前途的光电材料。
