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Efficient White Phosphorescent Organic Light-Emitting Diodes for Solid-State Lighting Applications Using an Exciton-Confining Emissive-Layer Structure
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- Authors
- Jong Hee Lee, Jeong Ik Lee, Joo Won Lee, Jun Yeob Lee, Dong Min Kang, Wei Yuan, Soon Ki Kwon, Hye Yong Chu
- Issue Date
- 2009-06
- Citation
- Journal of Information Display, v.10, no.2, pp.92-95
- ISSN
- 1598-0316
- Publisher
- 한국정보디스플레이학회
- Language
- English
- Type
- Journal Article
- Project Code
- 08IB3200, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- Highly efficient blue and white phosphorescent organic light-emitting diodes (PHOLEDs) with an exciton-confining structure were investigated in this study. Effective charge confinement was achieved by stacking two emitting layers with different charge-transporting properties, and blue PHOLEDs with a maximum luminance efficiency of 47.9 lm/W were developed by using iridium(III) bis(4,6-(difluorophenyl) pyridinato-N, C2')picolinate (FIrpic) as an electrophosphorescent dopant. Moreover, when the optimized green and red emitting layers were sandwiched between the two stacked blue emitting layers, white PHOLEDs (WOLEDs) with peak external and luminance efficiencies of 19.0% coupling technique.and 54.0 lm/W, respectively, were obtained without the use of any out-coupling technique. © 2009 Taylor & Francis Group, LLC.
- KSP Keywords
- Coupling technique, Effective charges, Layer structure, Luminance efficiency, Organic light-emitting diodes(OLEDS), Red emitting, Solid state lighting, blue PHOLEDs, blue-emitting, different charge, highly efficient