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Pyridine-functionalized carbazole donor and benzophenone acceptor design for thermally activated delayed fluorescence emitters in blue organic light emitting diodes

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Rajamalli_2018_JPE_Pyridine_AAM.pdf (9.071Mb)
Date
05/03/2018
Author
Pachai Gounder, Rajamalli
Rota Martir, Diego
Zysman-Colman, Eli
Keywords
Thermally activated delayed fluorescence (TADF)
OLEDs
Benzophenone
Blue emitter
Delayed fluorescence
QD Chemistry
NDAS
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Abstract
In this paper we report a new molecular design approach for blue emitting thermally activated delayed fluorescence (TADF) molecules. The two novel TADF emitters, (4-(3,6-di(pyridin-3-yl)-9H-carbazol-9- yl)phenyl)(phenyl)methanone ( 3PyCzBP ), and (4-(3,6-diphenyl-9H-carbazol-9-yl)phenyl)(phenyl)methanone ( 4PyCzBP ) possess a pyridine-functionalized carbazole donor and a benzophenone acceptor. Both compounds shows broad charge-transfer emission in DCM with a λmax at 497 nm and a photoluminescence quantum yield, ΦPL of 56% for 3PyCzBP and a λmax at 477 nm and a ΦPL of 52% for 4PyCzBP . The ΦPL decreased to 18% and 10%, respectively for 3PyCzBP and 4PyCzBP in the presence of O2 confirming that triplet states involved in emission. The PMMA doped (10 wt%) films show blue-shifted emission with λmax at 450 and 449 nm for 3PyCzBP and 4PyCzBP , respectively. The maximum ΦPL of 23.4% is achieved for these compounds in PMMA doped film. Difference in energy between the singlet and triplet excited states (ΔEST) is very small at 0.06 eV and 0.07 eV for 3PyCzBP and 4PyCzBP , respectively. Multilayer organic light emitting diode devices fabricated using these molecules as emitters show that the maximum efficiency (EQEmax) of the blue devices is 5.0%.
Citation
Pachai Gounder , R , Rota Martir , D & Zysman-Colman , E 2018 , ' Pyridine-functionalized carbazole donor and benzophenone acceptor design for thermally activated delayed fluorescence emitters in blue organic light emitting diodes ' , Journal of Photonics for Energy , vol. 8 , no. 3 , 032106 . https://doi.org/10.1117/1.JPE.8.032106
Publication
Journal of Photonics for Energy
Status
Peer reviewed
DOI
https://doi.org/10.1117/1.JPE.8.032106
ISSN
1947-7988
Type
Journal article
Rights
© 2018 SPIE. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1117/1.JPE.8.032106
Description
The authors thank the Marie Skłodowska-Curie Individual Fellowship (MCIF, no 749557), the Leverhulme Trust (RPG-2016-047) and EPSRC (EP/P010482/1) for financial support.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12949

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