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Paper | Special issue | Vol 90, No. 1, 2015, pp.261-270
Published online, 1st May, 2014
DOI: 10.3987/COM-14-S(K)16
■ Hexaaryl-benzodipyrroles: Properties and Application as Amorphous Carrier-Transporting Materials

Hayato Tsuji,* Yuki Yokoi, Shunsuke Furukawa, and Eiichi Nakamura*

*Department of Chemistry, Graduate School of Science, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8567, Japan

Abstract

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 π-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 cm2/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 α-NPD, a commonly used hole-transporting material.