Broadly absorbing perylene dyes bearing three-triarylamine groups were synthesized via Sonogashira coupling. The triarylamine moieties allowed further installation of electron donating ability, to enable tuning of the oxidation potential and optical band gap. With introducing more electron-donating groups into the three-triarylamine moieties the device performance was improved. The trend can be rationalized by the distribution of the electron density in the HOMO of the perylene moiety as well as the light-harvesting property of the perylene dyes.
通过Sonogashira偶联反应合成了含三个
三芳胺基团的广谱吸收
苝染料。
三芳胺基团进一步增强了电子给体能力,使得氧化电位和光学带隙的调整成为可能。随着更多电子给体基团引入到三个
三芳胺基团中,器件性能有所提升。该趋势可以通过
苝基团中最高占据轨道(HOMO)的电子密度分布以及
苝染料的光捕获特性来解释。