Design and synthesis of stable triarylamines for hole-transport applications

Three new tetrakis(triarylamino)methanes have been designed and synthesized. These triarylamines have been shown to exhibit high glass-transition temperatures and optimal oxidation potential for achieving efficient OLEDs. The para-position of the aryl rings is blocked with electron-donating t-butyl or methoxy groups, which enhances the radical cation stability of these molecules-a highly desirable quality for hole transporters. (C) 2001 Elsevier Science Ltd. All rights reserved.