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High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials
Open accessAbstract
We demonstrate high-efficiency organic light-emitting devices employing the green electrophosphorescent molecule, fac tris(2-phenylpyridine)iridium [Ir(ppy)3], doped into various electron-transport layer (ETL) hosts. Using 3-phenyl-4-(1′-naphthyl)-5-phenyl-1,2,4-triazole as the host, a maximum external quantum efficiency (ηext) of 15.4±0.2% and a luminous power efficiency of 40±2 Im/W are achieved. We show that very high internal quantum efficiencies (approaching 100%) are achieved for organic phosphors with low photoluminescence efficiencies due to fundamental differences in the relationship between electroluminescence from triplet and singlet excitons. Based on the performance characteristics of single and double heterostructures, we conclude that exciton formation in Ir(ppy)3 occurs within close proximity to the hole-transport layer/ETL:Ir(ppy)3 interface.
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Cited by
Electron Transport Materials for Organic Light-Emitting Diodes
Kulkarni, A. P., Tonzola, C. J., Babel, A., & Jenekhe, S. A. (2004) · Chemistry of Materials · doi:10.1021/cm049473l · Cited by 1,624
You, Y., & Nam, W. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35171d · Cited by 668
New charge-carrier blocking materials for high efficiency OLEDs
Adamovich, V. I., Cordero, S. R., Djurovich, P. I., Tamayo, A., Thompson, M. E., D’Andrade, B. W., & Forrest, S. R. (2003) · Organic Electronics · doi:10.1016/j.orgel.2003.08.003 · Cited by 355
Self-citationLi, J., Jiang, Y., Cheng, J., Zhang, Y., Su, H., Lam, J. W. Y., Sung, H. H. Y., Wong, K. S., Kwok, H. S., & Tang, B. Z. (2015) · Physical Chemistry Chemical Physics · doi:10.1039/c4cp04052j · Cited by 80
Metadata
- Authors
- Adachi, C., Baldo, M. A., Forrest, S. R., & Thompson, M. E.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 2000-08-07
- Volume
- 77
- Issue
- 6
- Pages
- 904-906
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W2072515914
- Cited by
- 1,042
- References
- 0
- FWCI
- 37.25
- Type
- journal article
- Language
- en
- Open access
- green
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- Adachi, C., Baldo, M. A., Forrest, S. R., & Thompson, M. E. (2000). High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials. Applied Physics Letters. https://doi.org/10.1063/1.1306639
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