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Triplet Harvesting for Efficient White Organic Light Emitting Diodes
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- Authors
- Jeong-Ik Lee, Hye Yong Chu, Jong Hee Lee, Sung Mook Chung
- Issue Date
- 2008-10
- Citation
- Journal of Nanoscience and Nanotechnology, v.8, no.10, pp.5602-5605
- ISSN
- 1533-4880
- Publisher
- American Scientific Publishers (ASP)
- Language
- English
- Type
- Journal Article
- Project Code
- 06IB2300, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- A novel hybrid device structure for efficient white organic light emitting diodes has been developed, which has a high hole injection barrier between a fluorescence blue emission layer and a electron transporting layer, and therefore excitons could be confined in the emission layer close to the electron transporting layer. A phosphorescent red dopant has been introduced into the electron transporting layer to harvest triplet states of the fluorescent blue emission layer and we have succeeded in obtaining the balanced white emission from blue singlet excitons and red triplet excitons with high efficiency. The optimized device showed the maximum external quantum efficiency of about 25% at 100cd/m 2. Copyright © 2008 American Scientific Publishers All rights reserved.
- KSP Keywords
- Blue emission, Device structure, External Quantum Efficiency, Hole injection barrier, Organic light-emitting diodes(OLEDS), Red dopant, Singlet excitons, Triplet exciton, Triplet harvesting, Triplet state, White organic light-emitting diodes