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학술지 Interlayer Engineering with Different Host Material Properties in Blue Phosphorescent Organic Light-Emitting Diodes
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저자
이종희, 이정익, 이주원, 추혜용
발행일
201102
출처
ETRI Journal, v.33 no.1, pp.32-38
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.11.0110.0172
협약과제
09MB7400, 고효율 백색 OLED 소자 기술 개발, 추혜용
초록
We investigated the light-emitting performances of blue phosphorescent organic light-emitting diodes, known as PHOLEDs, by incorporating an N,N'-dicarbazolyl-3,5-benzen interlayer between the hole transporting layer and emitting layer (EML). We found that the effects of the introduced interlayer for triplet exciton confinement and hole/electron balance in the EML were exceptionally dependent on the host materials: 9-(4-tert-butylphenyl)-3,6- bis(triphenylsilyl)-9H-carbazole, 9-(4-tert-butylphenyl)-3,6-ditrityl-9H- carbazole, and 4,4'-bis-triphenylsilanylbiphenyl. When an appropriate interlayer and host material were combined, the peak external quantum efficiency was greatly enhanced by over 21 times from 0.79% to 17.1%. Studies on the recombination zone using a series of host materials were also conducted. © 2011 ETRI.
키워드
Blue, Interlayer, Organic light-emitting diodes (OLED), Phosphorescent
KSP 제안 키워드
4-Tert-butylphenyl, Blue phosphorescent organic light-emitting diodes, Electron balance, Exciton confinement, External Quantum Efficiency, Hole transporting layer, Organic light-emitting diodes(OLEDS), Recombination zone, Triplet exciton, host material, interlayer engineering