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Improved Performance of White Phosphorescent Organic Light-Emitting Diodes through a Mixed-Host Structure
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- Authors
- Jong Hee Lee, Jeong Ik Lee, Hye Yong Chu
- Issue Date
- 2009-12
- Citation
- ETRI Journal, v.31, no.6, pp.642-646
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Project Code
- 08IB3200, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- Highly efficient white phosphorescent organic lightemitting diodes with a mixed-host structure are developed and the device characteristics are studied. The introduction of a hole-transport-type host (N, N'-dicarbazolyl-3-3-benzen (mCP)) into an electrontransport-type host (m-bis (triphenylsilyl)benzene (UGH3)) as a mixed-host emissive layer effectively achieves higher current density and lower driving voltage. The peak external quantum and power efficiency with the mixed-host structure improve up to 18.9% and 40.9 lm/W, respectively. Moreover, this mixed-host structure device shows over 30% enhanced performance compared with a single-host structure device at a luminance of 10,000 cd/m2 without any change in the electroluminescence spectra. Copyright © 2009 ETRI.
- KSP Keywords
- Device characteristics, Electroluminescence spectra, Hole transport, Organic light-emitting diodes(OLEDS), Power Efficiency, Single-host, current density, emissive layer(EL), enhanced performance, highly efficient, improved performance