| 초록 |
9-(3''-(carbazol-9-yl)-[1,1',3',1''-terphenyl]-3-yl)-carbazole-3-carbonitrile (TPCzCN) was designed as a host of blue phosphorescent organic light-emitting diode. Terphenyl core was introduced for high triplet energy and thermal stability and CN was introduced for electron transport properties. Triplet energy and glass transition temperature of TPCzCN were 2.77 eV and 126 ℃ as a blue phosphorescence host in organic light-emitting diode. The maximum external quantum efficiencies of blue phosphorescence organic light-emitting diode with TPCzCN and 3,3-di(9H-carbazol-9-yl)biphenyl (mCBP) hosts were 26.6 %, 24.4 %, respectively. The device lifetime of the blue PHOLEDs having TPCzCN: tris[1-(2,4-diisopropyldibenzo[b,d] furan-3-yl)-2-phenylimidazole] (Ir(dbi)3) was longer than that of the blue PHOLEDs based on the mCBP:Ir(dbi)3 due to stabilized chemical bond by CN substituent. |
