Hexaaryl-benzodipyrroles: Properties and Application as Amorphous Carrier-Transporting Materials
摘要:
We have newly synthesized 1,2,3,5,6,7-hexaarylbenzo-[1,2-b:4,5-b']dipyrroles (HABDPs) and studied their properties. The HABDPs showed UV absorption maxima at 377-390 nm, indicating their extended pi-conjugation system. They were also found to serve as efficient amorphous materials, featuring high electrochemical and thermal stability with high carrier mobility of up to 10(-3) cm(2)/Vs using the time-of-flight technique. Application of the HABDPs to organic light-emitting diodes resulted in significantly improved performance in driving voltage and efficiency compared with alpha-NPD, a commonly used hole-transporting material.