Poly(4-vinyltriphenylamine): synthesis and application as a hole transportlayer in light-emitting diodes

An efficient synthesis of 4-vinyltriphenylamine has been developed. This mo nomer has been polymerised using both anionic and free radical initiators t o provide polymers suitable for casting films from solution. Light emitting diodes have been fabricated using this polymer as a hole transport layer ( HTL). Comparable devices have been fabricated using evaporated triphenylami ne or N,N'-diphenyl-N,N'-ditolylbenzidine as the HTL. Devices with the poly meric HTL display a greater brightness than those with the evaporated layer s.