HOLE TRANSPORTING MATERIALS WITH HIGH GLASS-TRANSITION TEMPERATURES FOR USE IN ORGANIC LIGHT-EMITTING DEVICES

Communication: Efficient and stable organic light-emitting devices (OL EDs) can be fabricated using hole transporting materials with a high g lass transition temperature (T-g), as reported here. A series of devic es utilizing high T-g hole transporting layers, consisting of compound s with a biphenyl backbone such as the one shown in the Figure, are in vestigated with respect to their I-V characteristics, external quantum efficiencies, ionization potentials, and electron affinities.