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High-efficiency deep-blue organic light-emitting diodes based on a thermally activated delayed fluorescence emitter
Abstract
Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole)phenyl]sulfone (DMOC-DPS). In comparison with the previously reported carbazole/sulfone derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.
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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
Hatakeyama, T., Shiren, K., Nakajima, K., Nomura, S., Nakatsuka, S., Kinoshita, K., Ni, J., Ono, Y., & Ikuta, T. (2016) · Advanced Materials · doi:10.1002/adma.201505491 · Cited by 2,379
The theory of thermally activated delayed fluorescence for organic light emitting diodes
Penfold, T. J., Dias, F. B., & Monkman, A. P. (2018) · Chemical Communications · doi:10.1039/c7cc09612g · Cited by 341
Yang, S.-Y., Wang, Y.-K., Peng, C.-C., Wu, Z.-G., Yuan, S., Yu, Y.-J., Li, H., Wang, T.-T., Li, H.-C., Zheng, Y.-X., et al. (2020) · Journal of the American Chemical Society · doi:10.1021/jacs.0c08980 · Cited by 322
Numata, M., Yasuda, T., & Adachi, C. (2015) · Chemical Communications · doi:10.1039/c5cc00307e · Cited by 304
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Metadata
- Authors
- Wu, S., Aonuma, M., Zhang, Q., Huang, S., Nakagawa, T., Kuwabara, K., & Adachi, C.
- Venue
- J. Mater. Chem. C
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2014
- Volume
- 2
- Issue
- 3
- Pages
- 421-424
- ISSN
- 2050-7526 (ISSN-L)
- 2050-7534
- OpenAlex
- W2105226034
- Cited by
- 284
- References
- 0
- FWCI
- 19.77
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wu, S., Aonuma, M., Zhang, Q., Huang, S., Nakagawa, T., Kuwabara, K., & Adachi, C. (2014). High-efficiency deep-blue organic light-emitting diodes based on a thermally activated delayed fluorescence emitter. J. Mater. Chem. C. https://doi.org/10.1039/c3tc31936a
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