A New Carbazole-based Conjugated Multibranched Molecule and Its Tetramer as Hole Transporting Materials
作者:Tae Wan Lee、Hong Suk Kim、Min Ju Cho、Kyung Hwan Kim、Dong Hoon Choi
DOI:10.1246/cl.2008.952
日期:2008.9.5
A conjugated multibranched molecule, 1,3,5-tris(E)-2-[9-hexyl-9H-carbazol-3-yl]vinyl}benzene (THCEB) and its tetramer, 1,3,5-tris((E)-2-9-[6-(3-(E)-3,5-bis[(E)-2-(9-hexyl-9H-carbazol-3-yl)vinyl]styryl}-9H-carbazol-9-yl)hexyl]-9H-carbazol-3-yl}vinyl)benzene (4(THCEB)), have been synthesized through Heck coupling and Horner–Emmons reactions in moderately good yields. These compounds exhibited good self-film-forming properties by spin coating. These two large molecules showed an absorption maxima at around 346–348 nm in their solution states. The maximum PL intensities of THCEB and 4(THCEB) films were commonly observed at around 450 nm, except for a strong emission band at 535 nm in THCEB. In the tetramer, the emission at 535 nm was highly suppressed. This observation was explained in terms of the time-resolved photophysical properties of these molecules with the help of a possible mechanism.
共轭多支链分子 1,3,5-三(E)-2-[9-己基-9H-咔唑-3-基]乙烯基}苯 (THCEB) 及其四聚体 1,3,5-三((E)-2-9-[6-(3-(E)-3、5-双[(E)-2-(9-己基-9H-咔唑-3-基)乙烯基]苯乙烯基}-9H-咔唑-9-基)己基]-9H-咔唑-3-基}乙烯基)苯(4(THCEB))。通过旋涂,这些化合物表现出良好的自成膜特性。这两种大分子在溶液状态下的最大吸收波长约为 346-348 纳米。THCEB 和 4(THCEB) 薄膜的最大聚光强度通常在 450 纳米左右,但 THCEB 在 535 纳米处有一个强发射带。在四聚体中,535 纳米处的发射被高度抑制。这一观察结果可以用这些分子的时间分辨光物理特性和一种可能的机制来解释。