The Influence of Quasiplanar Structures of Partially Oxygen-Bridged Triphenylamine Dimers on the Properties of their Bulk Films

Hidetaka Nishimura, Tatsuya Fukushima, Atsushi Wakamiya, Yasujiro Murata, and Hironori Kaji

10.1246/bcsj.20160031

Two kinds of oxygen-bridged triphenylamine dimers show characteristic charge-transporting behaviors, which are attributed to the difference in the partially retained π-stacking structures in their vapor-deposited films. OLEDs using these compounds as hole-injection layers exhibited higher external quantum efficiencies compared to a standard device.