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Exciplex‐Forming Co‐host for Organic Light‐Emitting Diodes with Ultimate Efficiency
Abstract
Phosphorescent organic light‐emitting diodes (OLEDs) with ultimate efficiency in terms of the external quantum efficiency (EQE), driving voltage, and efficiency roll‐off are reported, making use of an exciplex‐forming co‐host. This exciplex‐forming co‐host system enables efficient singlet and triplet energy transfers from the host exciplex to the phosphorescent dopant because the singlet and triplet energies of the exciplex are almost identical. In addition, the system has low probability of direct trapping of charges at the dopant molecules and no charge‐injection barrier from the charge‐transport layers to the emitting layer. By combining all these factors, the OLEDs achieve a low turn‐on voltage of 2.4 V, a very high EQE of 29.1% and a very high power efficiency of 124 lm W−1. In addition, the OLEDs achieve an extremely low efficiency roll‐off. The EQE of the optimized OLED is maintained at more than 27.8%, up to 10 000 cd m−2.
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Cited by
Recent advances in organic thermally activated delayed fluorescence materials
Yang, Z., Mao, Z., Xie, Z., Zhang, Y., Liu, S., Zhao, J., Xu, J., Chi, Z., & Aldred, M. P. (2017) · Chemical Society Reviews · doi:10.1039/c6cs00368k · Cited by 2,395
Xu, Y., Cheng, Z., Li, Z., Liang, B., Wang, J., Wei, J., Zhang, Z., & Wang, Y. (2020) · Advanced Optical Materials · doi:10.1002/adom.201902142 · Cited by 513
Lee, D. R., Kim, M., Jeon, S. K., Hwang, S., Lee, C. W., & Lee, J. Y. (2015) · Advanced Materials · doi:10.1002/adma.201502053 · Cited by 306
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Metadata
- Authors
- Park, Y., Lee, S., Kim, K., Kim, S., Lee, J., & Kim, J.
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2013-05-06
- Volume
- 23
- Issue
- 39
- Pages
- 4914-4920
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W2096162031
- Cited by
- 486
- References
- 0
- FWCI
- 25.56
- Type
- journal article
- Language
- en
- Open access
- closed
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- Park, Y., Lee, S., Kim, K., Kim, S., Lee, J., & Kim, J. (2013). Exciplex‐Forming Co‐host for Organic Light‐Emitting Diodes with Ultimate Efficiency. Advanced Functional Materials. https://doi.org/10.1002/adfm.201300547
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