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Efficiency Enhancement of Organic Light‐Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter
Open accessAbstract
An organic light‐emitting diode (OLED) with the blue emitter CC2TA showing thermally activated delayed fluorescence (TADF) is presented exhibiting an external quantum efficiency () of 11% ± 1%, which clearly exceeds the classical limit for fluorescent OLEDs. The analysis of the emission layer by angular dependent photoluminescence (PL) measurements shows a very high degree of 92% horizontally oriented transition dipole moments. Excited states lifetime measurements of the prompt fluorescent component under PL excitation yield a radiative quantum efficiency of 55% of the emitting species. Thus, the radiative exciton fraction has to be significantly higher than 25% due to TADF. Performing a simulation based efficiency analysis for the OLED under investigation allows for a quantification of individual contributions to the efficiency increase originating from horizontal emitter orientation and TADF. Remarkably, the strong horizontal emitter orientation leads to a light‐outcoupling efficiency of more than 30%.
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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
All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes
Liu, Y., Li, C., Ren, Z., Yan, S., & Bryce, M. R. (2018) · Nature Reviews Materials · doi:10.1038/natrevmats.2018.20 · Cited by 1,644
Chen, X., Tsuchiya, Y., Ishikawa, Y., Zhong, C., Adachi, C., & Brédas, J. (2017) · Advanced Materials · doi:10.1002/adma.201702767 · Cited by 260
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Metadata
- Authors
- Mayr, C., Lee, S. Y., Schmidt, T. D., Yasuda, T., Adachi, C., & Brütting, W.
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2014-06-11
- Volume
- 24
- Issue
- 33
- Pages
- 5232-5239
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W2163687325
- Cited by
- 175
- References
- 0
- FWCI
- 11.67
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Efficiency Enhancement of Organic Light‐Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter. https://app.cochat.ai/papers/10.1002/adfm.201400495
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- Mayr, C., Lee, S. Y., Schmidt, T. D., Yasuda, T., Adachi, C., & Brütting, W. (2014). Efficiency Enhancement of Organic Light‐Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter. Advanced Functional Materials. https://doi.org/10.1002/adfm.201400495
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