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A New Molecular Design Based on Thermally Activated Delayed Fluorescence for Highly Efficient Organic Light Emitting Diodes
Abstract
Two benzoylpyridine-carbazole based fluorescence materials DCBPy and DTCBPy, bearing two carbazolyl and 4-(t-butyl)carbazolyl groups, respectively, at the meta and ortho carbons of the benzoyl ring, were synthesized. These molecules show very small ΔEST of 0.03 and 0.04 eV and transient PL characteristics indicating that they are thermally activated delayed fluorescence (TADF) materials. In addition, they show extremely different photoluminescent quantum yields in solution and in the solid state: in cyclohexane the value are 14 and 36%, but in the thin films, the value increase to 88.0 and 91.4%, respectively. The OLEDs using DCBPy and DTCBPy as dopants emit blue and green light with EQEs of 24.0 and 27.2%, respectively, and with low efficiency roll-off at practical brightness level. The crystal structure of DTCBPy reveals a substantial interaction between the ortho donor (carbazolyl) and acceptor (4-pyridylcarbonyl) unit. This interaction between donor and acceptor substituents likely play a key role to achieve very small ΔEST with high photoluminescence quantum yield.
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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
Guo, J., Li, X., Nie, H., Luo, W., Gan, S., Hu, S., Hu, R., Qin, A., Zhao, Z., Su, S., et al. (2017) · Advanced Functional Materials · doi:10.1002/adfm.201606458 · Cited by 444
Yuan, Y., Tang, X., Du, X., Hu, Y., Yu, Y., Jiang, Z., Liao, L., & Lee, S. (2019) · Advanced Optical Materials · doi:10.1002/adom.201801536 · Cited by 404
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
Metadata
- Authors
- Rajamalli, P., Senthilkumar, N., Gandeepan, P., Huang, P.-Y., Huang, M.-J., Ren-Wu, C.-Z., Yang, C.-Y., Chiu, M.-J., Chu, L.-K., Lin, H.-W., & Cheng, C.-H.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-01-07
- Volume
- 138
- Issue
- 2
- Pages
- 628-634
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2233213627
- Cited by
- 404
- References
- 0
- FWCI
- 22.61
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rajamalli, P., Senthilkumar, N., Gandeepan, P., Huang, P.-Y., Huang, M.-J., Ren-Wu, C.-Z., Yang, C.-Y., Chiu, M.-J., Chu, L.-K., Lin, H.-W., & Cheng, C.-H. (2016). A New Molecular Design Based on Thermally Activated Delayed Fluorescence for Highly Efficient Organic Light Emitting Diodes. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.5b10950
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