Novel hole-transporting carbazole main chain oligomer and its model glass-forming compound

Summary The oligomer containing 9-[2-(9H-carbazo1-9-yl)cyclobutyl]-9H-carbazole moiety in the main chain and its model compound were synthesized by Wittig reaction. Both compounds form glasses with glass transition temperatures of 254°C and 135°C respectively. The optical and photoelectrical properlies of the compounds were studied. The hole drift mobilities observed in the film of the oligoiner by the time of flight technique were in the range of 2·10⁻⁶ – 7·10⁻⁶ cm²/(V·s) at an applied electric field ranging from 5·8.10⁴ to 2·7.10⁵ V/cm. Rcceivcd: 3 April 2002/Revised version: 16 July 2002/ Accepted: 5 August 2002 Correspondence to Juozas V. Grazulevicius e-mail: juogra@ctf.ktu.lt. Tel/Fax: +37 07 456525