Blue phosphorescent organic light-emitting devices with the emissive layer of mCP:FCNIr(pic)

Abstract

New high-efficiency blue-light-emitting phosphorescent devices with 300Å-thick emissive layer of N,N′-dicarbazolyl-3,5-benzene [mCP] doped with 10 vol. bis[(3,5-difluoro-4-cyanophenyl)pyridine]iridium picolinate [FCNIr(pic)] were fabricated with the different treatments of hole and electron transport layers. In the experiments, a single layer of 1,1-bis-(di-4- polyaminophenyl)cyclohexane [TAPC] and a double layer of N,N′-di(1- naphthyl)-N,N′-diphenylbenzidine [NPB] and mCP were used as hole transport layers (HTLs). In addition, 500Å-thick double layers of tris-[3-(3-pyridyl)mesityl]borane [3TPYMB] and 4,7-diphenyl-1,10-phenanthroline [Bphen] were used as electron transport layers (ETLs) with various thickness combination of 3TPYMB/Bphen. Among the fabricated devices, the one using TAPC as an HTL and 3TPYMB(100)/Bphen(400) as an ETL showed best electroluminescent characteristics with a maximum quantum efficiency of 13.3 and a luminance of 950cd/m2 at 10V. The color coordinates were (0.14, 0.22) on the Commission Internationale de I'Eclairage (CIE) chart, and the electroluminescent spectra showed the double-peak emissions at 458nm and 483nm. Copyright © 2012 Ji Geun Jang and Hyun Jin Ji.