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Journal Article
High Efficiency Deep Blue Phosphorescent Organic Light-Emitting Diodes using a Double Emissive Layer Structure
- Authors
- Jong Hee Lee, Jeong Ik Lee, Jun Yeob Lee, Hye Yong Chu
- Issue Date
- 2009-10
- Citation
- Synthetic Metals, v.159 no.19-20, pp.1956-1959
- ISSN
- 0379-6779
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Project Code
- 08IB3200, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- High efficiency deep blue phosphorescent organic light-emitting diodes (PHOLEDs) have been developed with a double emissive layer structure (D-EML). Using bis(4??,6??-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6) as an electro-phosphorescent dopant, we achieved a maximum external quantum efficiency of 14.8% in the deep blue PHOLEDs with D-EMLs, which is 50% higher value than that of 9.76% with single emissive layer structure (S-EML). Moreover, the external quantum efficiency at high current density region of 10 mA/cm2 was maintained up to 11.3% in this D-EML device. We attributed this enhancement to the expansion of carrier recombination region and the effective confinement of exciton within the emissive layer. Crown Copyright © 2009.
- KSP Keywords
- Carrier Recombination, Deep blue phosphorescent organic light-emitting diodes, External Quantum Efficiency, Layer structure, Organic light-emitting diodes(OLEDS), blue PHOLEDs, emissive layer(EL), high current density, high efficiency, light-emitting diode(LED)