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DA-YOUNG PARK1, MI-YOUNG HA1, DAE-GYU MOON1,*
- Department of Materials Engineering, Soonchunhyang University, 646, Eupnae-ri, Shinchang-myeon, Asan-si, Chungcheongnam-do, 336-745, Republic of Korea
We have developed highly efficient bilayer red phosphorescent organic light-emitting devices (OLEDs) using a solutionprocessed poly(N-vinylcarbazole) (PVK) host layer doped with tris(2-phenyl-1-quinoline)iridium(III) [Ir(phq)3] molecules. PVK was mixed with Ir(phq)3 molecules of 0.2 - 10 wt% in a chlorobenzene solution and spin-coated in order to prepare the emission layer. 3-(4-biphenyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ) was used as an electron transport material. The electrical conduction, emission, and efficiency characteristics of the OLEDs with a resultant structure of ITO/PVK:Ir(phq)3/TAZ/LiF/Al were investigated. The maximum current efficiency and external quantum efficiency were 19.5 cd/A and 10.5%, respectively, in the device with 1% Ir(phq)3 doped PVK host layer..
OLED, Phosphorescence, Solution processing, PVK.
Submitted at: June 29, 2017
Accepted at: Nov. 28, 2017
DA-YOUNG PARK, MI-YOUNG HA, DAE-GYU MOON, Highly efficient bilayer red phosphorescent organic light-emitting devices with solution-processed emission layer, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 11-12, pp. 748-752 (2017)
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