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학술지 Enhanced Performances in Inverted Bottom-Emission Organic Light-Emitting Diodes with KBH4-Doped Electron-Injection Layer
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저자
이현구, 권용원, 정희영, 이정익, 이창희
발행일
201412
출처
Physica Status Solidi (A), v.211 no.8, pp.1807-1811
ISSN
1862-6300
출판사
Wiley-VCH Verlag GmbH
DOI
https://dx.doi.org/10.1002/pssa.201330480
협약과제
13VB1900, 에너지 절감을 위한 7인치기준 2W급 환경적응 디스플레이 신모드 핵심 원천 기술 개발, 추혜용
초록
We report that a potassium borohydride (KBH4)-doped 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB) layer can be utilized as an efficient electron-injection layer (EIL) for the inverted bottom-emission organic light-emitting diodes (IBE-OLEDs). The KBH4-doped EIL in the IBE-OLEDs having tris(2-phenylpyridine)iridium(III) as a green phosphorescent dopant show a lower turn-on voltage (~7 V) and about two times higher efficiency (~13.9% and 44.5 cd A-1 at 0.63 mA cm-2) compared with the device without the KBH4-doped EIL. Furthermore, the KBH4-doped EIL rarely affects the electroluminescence spectrum of the device. The KBH4-doped TmPyPB films with different doping ratios are also analyzed by using electron-only devices (EODs) and X-ray photoemission spectroscopy. As the doping ratio of the KBH4 increases, the current of the EOD and the amounts of potassium increase. This result indicates that the potassium improves the electron-injection ability of an organic electron-transport layer. Therefore, the KBH4-doped EIL can be utilized as an effective EIL in the inverted structure OLEDs. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
키워드
doping, electron injection, organic light-emitting diodes
KSP 제안 키워드
2-Phenylpyridine, Co. KGaA, Doping ratio, Electroluminescence spectrum, Higher efficiency, Injection ability, Organic light-emitting diodes(OLEDS), Potassium borohydride, Turn-on voltage, X-ray photoemission spectroscopy, electron injection layer