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학술지 Phenylimidazole-based Homoleptic Iridium(III) Compounds for Blue Phosphorescent Organic Light-emitting Diodes with High Efficiency and Long Lifetime
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저자
조현수, 이종희, 이정익, 조남성, 박정환, 이준엽, 강영진
발행일
201607
출처
Organic Electronics, v.34, pp.91-96
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2016.04.026
협약과제
15PB1200, 에너지 절감을 위한 연색지수 90이상의 고연색 OLED 조명용 유기소재 핵심원천 기술개발, 이정익
초록
In order to obtain triplet emitters with high stability and efficiency, three homoleptic iridium(III) compounds - specifically, Ir(tpim)3 (1), Ir(mtpim)3 (2), and Ir(itpim)3 (3), where tpim = 1-([1,1??:3??,1??-terphenyl]-2??-yl)-2-(4-fluorophenyl)-1H-imidazole, mtpim = 2-(4-fluorophenyl)-1-(5??-methyl-[1,1??:3??,1??-terphenyl]-2??-yl)-1H-imidazole, and itpim = 2-(4-fluorophenyl)-1-(5??-isopropyl-[1,1??:3??,1??-terphenyl]-2??-yl)-1H-imidazole - were prepared by one-pot reaction of the corresponding phenylimidazole ligand with an Ir(I) complex as a starting material. Compounds 1-3 emit bright sky-blue phosphorescence with {\\lambda}max = 459-463 nm and phosphorescent quantum efficiencies of 0.38-0.50. Multi-layer phosphorescent organic light-emitting diodes using compounds 1-3 as the triplet emitters and mCBP (3,3-di(9H-carbazol-9-yl)biphenyl) as the host have been fabricated. Compound 3 doped in the emissive layer demonstrate external quantum efficiency as high as 20.1% at 1000 cd/m2. In addition, the device based on compound 1 as an emitter shows a stable lifetime greater than 300 h at 1000 cd/m2, which is one of the best results concerning the device lifetime.
키워드
Blue phosphorescence, Dopants, Life-time, Organic light-emitting diodes (OLEDs)
KSP 제안 키워드
As 2, Blue phosphorescent organic light-emitting diodes, External Quantum Efficiency, Long Lifetime, Methyl-, One-pot reaction, Organic light-emitting diodes(OLEDS), Starting material, Triplet emitters, blue phosphorescence, device lifetime