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Journal Article Highly Efficient All Phosphorescent White Organic Light-Emitting Diodes for Solid State Lighting Applications
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Authors
Jonghee Lee, Joo-Won Lee, Nam Sung Cho, Joohyun Hwang, Chul Woong Joo, Woo Jin Sung, Hye Yong Chu, Jeong-Ik Lee
Issue Date
2014-03
Citation
Current Applied Physics, v.14, no.Supplement 1, pp.S84-S87
ISSN
1567-1739
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.cap.2013.11.035
Project Code
13VB3800, AMOLED TV용 soluble TFT 및 화소 형성 소재/공정 기술 개발, Lee Jonghee
Abstract
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.
KSP Keywords
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, highly efficient