Two novel wet-processable asymmetric 1,4-phenylenediamine derivatives having the 9-phenanthryl groups (PHENs) were synthesized. The properties of PHENs doped with the electron acceptor tris(4-bromophenyl)aminium hexachloroantimonate (TBPAH) as the anode buffer layer were investigated in organic light-emitting devices (OLEDs). PHENs were treated with anisole to form homogeneous layers without crystallization by the wet process, and were effective for surface smoothing of the anode. Higher performance was obtained by annealing the doped layer owing to the high glass transition point (Tg, 155 °C), which indicated that the radical cation species possessed high stability at the temperature near its Tg.
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