Blue phosphorescent organic light-emitting diodes using an exciplex forming co-host with the external quantum efficiency of theoretical limit.
A high-efficiency blue-emitting organic light-emitting diode (OLED) approaching theoretical efficiency using an exciplex-forming co-host composed of N,N'-dicarbazolyl-3,5-benzene (mCP) and bis-4,6-(3,5-di-3-pyridylphenyl)- 2-methylpyrimidine (B3PYMPM) is fabricated. Iridium(III)bis[(4,6-difluorophenyl)- pyridinato-N,C2']picolinate (FIrpic) is used as the emitter, which turns out to have a preferred horizontal dipole orientation in the emitting layer. The OLED shows a maximum external quantum efficiency of 29.5% (a maximum current efficiency of 62.2 cd A(-1) ), which is in perfect agreement with the theoretical prediction.
Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea.
Hyun
H
Shin
Sunghun
S
Lee
Kwon-Hyeon
KH
Kim
Chang-Ki
CK
Moon
Seung-Jun
SJ
Yoo
Jeong-Hwan
JH
Lee
Jang-Joo
JJ
Kim
D003116:Color; D056831:Coordination Complexes / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements; D011789:Quantum Theory; D012666:Semiconductors
D056831:Coordination Complexes; C000593319:bis((4,6-difluorophenyl)pyridinato-N,C(2'))iridium(III)picolinate
FIrpic; blue phosphorescent OLED; exciplex forming co-host; map of maximum achievable EQE