Arylamino-9,10-diphenylanthracenes for organic light emitting devices

Hole-transporting arylamino-9,10-diphenylanthracene derivatives were synthesized by C–N cross coupling with palladium catalyst. The materials showed higher glass transition temperatures (135–177 °C) than that of a conventional hole-transporting material, N,N’-bis(naphthalen-1-yl)-N,N’-bis(phenyl)benzidine (NPD). The compounds all showed higher hole mobilities than that of NPD, with one of the compounds showing a much higher hole mobility of ∼1.0 × 10−2 cm2 V−1s−1. Tris-(8-quinolinolato) aluminum (Alq3)-based green light emitting devices containing the arylamino-9,10-diphenylanthracene derivatives as hole transport layers were fabricated. The devices containing the anthracene derivatives showed lower driving voltages and higher efficiencies compared with those of the equivalent device containing NPD. The anthracene derivative with a dibenzofuran substituent was also used as the emitting material in a device. This device emitted blue light with high efficiencies of 5.0 lm/W and 6.3 cd/A at 4.0 V and 1000 cd/m2, respectively.