| 초록 |
An electron transport type host withstanding the positive polaron stress was synthesized using the BFP core to develop high triplet energy host. The host was designed to have both the tetraphenylsilyl blocking group and the hole transport type carbazole group. In the device application, the host was used as electron transport type host mixed with a hole transport type 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl (mCBP) host in the blue PhOLEDs doped with fac-tris(3-(1-(2,6-diisopropylphenyl)-1H-imidazol-2-yl)benzonitrile)iridium (CNImIr) and [[5‐(1,1‐dimethylethyl)‐3‐phenyl‐1H‐imidazo[4,5‐b]pyrazin‐1‐yl‐2(3H)‐ylidene]‐1,2‐phenylene]bis[[6‐(1,1‐dimethylethyl)‐3‐phenyl‐1H‐imidazo[4,5‐b]pyrazin‐1‐yl‐2(3H)‐ylidene]‐1,2‐phenylene]iridium (Ir(cb)3) blue phosphors. the mCBP/CzBFPmSi mixed host showed high external quantum efficiency (EQE) over 20% at 1000 cd m−2 and low efficiency roll‐off in the blue phosphorescent organic light-emitting diodes. |
