The DOI matches its Crossref record; 26 of the 26 references it cites were found in a registry or an index.
Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States
Open accessAbstract
The photophysics of thermally activated delayed fluorescence (TADF) in phenothiazine‐dibenzothiophene‐S,S‐dioxide (PTZ‐DBTO2) molecule is investigated in detail. First, it is shown that the proximity of local triplet excited states (3 LE), e.g., 3 D or 3 A, above or below the DA charge transfer states (CT) is crucial for the efficiency of the TADF mechanism in PTZ‐DBTO2. This TADF emitter is then used as a monomer unit to design polymer materials with efficient TADF. The reverse intersystem crossing mechanism (RISC) that supports TADF is able to compete with internal conversion and triplet–triplet annihilation (TTA) in the polymer chains and generates efficient TADF emission in the polymer pristine films. Prototype devices with PTZ‐DBTO2 dispersed in 4,4′‐bis(N‐carbazolyl)‐2,2′‐biphenyl (CBP) host give excellent performance with EQE of ≈22% at low luminance (<100 cd m−2), for 100 cd m−2 the EQE is 19.4%. In the case of solution processed devices, using the novel TADF polymers, the performance is much lower, EQE ≈3.5% at 100 cd m−2, which is still the highest value for a polymer TADF system at useful brightness, yet reported. This results from a combination of weak charge transport properties in these materials and device fabrication methods that require further improvement. Nevertheless, these results pave the way to explore TADF in polymer light emitting diodes (PLEDs), using less costly deposition methods, such as spin‐coating and inkjet printing, which are more appropriate for large area deposition.
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Cites
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Thermally Activated Delayed Fluorescence Materials Towards the Breakthrough of Organoelectronics
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Cited by
Recent advances in organic thermally activated delayed fluorescence materials
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All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes
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Self-citationSamanta, P. K., Kim, D., Coropceanu, V., & Brédas, J.-L. (2017) · Journal of the American Chemical Society · doi:10.1021/jacs.6b12124 · Cited by 1,025
Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence
Etherington, M. K., Gibson, J., Higginbotham, H. F., Penfold, T. J., & Monkman, A. P. (2016) · Nature Communications · doi:10.1038/ncomms13680 · Cited by 1,012
Self-citationPhotophysics of thermally activated delayed fluorescence molecules
Dias, F. B., Penfold, T. J., & Monkman, A. P. (2017) · Methods and Applications in Fluorescence · doi:10.1088/2050-6120/aa537e · Cited by 578
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Metadata
- Authors
- Nobuyasu, R. S., Ren, Z., Griffiths, G. C., Batsanov, A. S., Data, P., Yan, S., Monkman, A. P., Bryce, M. R., & Dias, F. B.
- Venue
- Advanced Optical Materials
- Publisher
- Wiley
- Published
- 2016-01-12
- Volume
- 4
- Issue
- 4
- Pages
- 597-607
- ISSN
- 2195-1071 (ISSN-L)
- OpenAlex
- W2264884949
- Cited by
- 288
- References
- 26
- FWCI
- 17.53
- Type
- journal article
- Language
- en
- Open access
- green
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- Nobuyasu, R. S., Ren, Z., Griffiths, G. C., Batsanov, A. S., Data, P., Yan, S., Monkman, A. P., Bryce, M. R., & Dias, F. B. (2016). Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States. Advanced Optical Materials. https://doi.org/10.1002/adom.201500689
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