Development of transparent organic hole-transporting materials using partially oxygen-bridged triphenylamine skeletons

Abstract

M-Benzene-linked derivatives of partially oxygen-bridged triphenylamine were designed and synthesized as transparent hole-transporting materials, which show absorption bands only in the UV region (-425 nm). Vacuum-deposited films of these compounds retain amorphous states even after heating at 160 °C and exhibit good hole mobility in the same order to the directly connected dimer.