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학술지 Highly Efficient All Phosphorescent White Organic Light-Emitting Diodes for Solid State Lighting Applications
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저자
이종희, 이주원, 조남성, 황주현, 주철웅, 성우진, 추혜용, 이정익
발행일
201403
출처
Current Applied Physics, v.14 no.Supplement 1, pp.S84-S87
ISSN
1567-1739
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.cap.2013.11.035
협약과제
13VB3800, AMOLED TV용 soluble TFT 및 화소 형성 소재/공정 기술 개발, 이종희
초록
We report highly efficient all phosphorescent white organic light-emitting diodes (OLEDs) with an exciton-confinement structure. By stacking two emissive layers (EMLs) with different charge transporting properties, effective charges as well as exciton confinements were achieved. Accordingly, efficient blue OLEDs with a peak external quantum efficiency (EQE) over 22% and power efficacy (PE) over 50 lm/W were developed by using iridium(III) bis(4,6-(difluorophenyl) pyridinato-N,C2??)picolinate (FIrpic) as an electro-phosphorescent dopant. When the optimized orange and red EMLs were sandwiched between the stacked two blue EMLs, white OLEDs with an EQE and PE of 24.3% and 45.9 lm/W at a luminance of 1000 cd/m2 were obtained without the use of any out-coupling techniques. In addition, these white OLEDs exhibit a color rendering index (CRI) value of 84 with high efficacy. © 2013 Elsevier B.V. All rights reserved.
키워드
Exciton, High efficiency, Organic light-emitting diodes (OLEDs), Phosphorescent, White
KSP 제안 키워드
Blue OLEDs, Charge transporting, Color rendering index, Coupling technique, Effective charges, External Quantum Efficiency, Organic light-emitting diodes(OLEDS), Phosphorescent white organic light-emitting diodes, Solid state lighting, different charge, high efficiency