Interfacial TADF Exciplex as a Tool to Localise Excitons, Improve Efficiency and Increase OLED Lifetime

Colella, Marco; Pander, Piotr Henryk; Pereira, Daniel De Sa; Monkman, Andrew P.

doi:10.1021/acsami.8b15942

Interfacial TADF Exciplex as a Tool to Localise Excitons, Improve Efficiency and Increase OLED Lifetime

Colella, Marco; Pander, Piotr Henryk; Pereira, Daniel De Sa; Monkman, Andrew P.

Authors

Marco Colella

Piotr Pander piotr.h.pander@durham.ac.uk
Academic Visitor

Daniel De Sa Pereira

Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor

Abstract

In this work, we employ a TADF exciplex formed between the emissive layer (EML) host, 26DCzPPy, and the electron transport layer (ETL), PO-T2T at the interface between the EML and the ETL to improve the stability and efficiency of a phosphorescence OLED based on Ir(dmpq)2acac. We show that the presence of the TADF exciplex at the EML-ETL interface induces an efficient localisation of the recombination zone which is confined within the 5 nm thick EML. Furthermore, the TADF exciplex allows harvesting of the holes and electrons that piled-up at the EML-ETL interface and transfer the resultant excited state energy to the phosphorescent emitter through Förster and/or Dexter energy transfer. This approach effectively improves the LT90 of devices from <1 min to 6 h by limiting recombination processes outside of the 5 nm EML.

Citation

Colella, M., Pander, P. H., Pereira, D. D. S., & Monkman, A. P. (2018). Interfacial TADF Exciplex as a Tool to Localise Excitons, Improve Efficiency and Increase OLED Lifetime. ACS Applied Materials and Interfaces, 10(46), 40001-40007. https://doi.org/10.1021/acsami.8b15942

Journal Article Type	Article
Acceptance Date	Nov 1, 2018
Online Publication Date	Nov 1, 2018
Publication Date	Nov 1, 2018
Deposit Date	Nov 6, 2018
Publicly Available Date	Nov 1, 2019
Journal	ACS Applied Materials and Interfaces
Print ISSN	1944-8244
Electronic ISSN	1944-8252
Publisher	American Chemical Society
Peer Reviewed	Peer Reviewed
Volume	10
Issue	46
Pages	40001-40007
DOI	https://doi.org/10.1021/acsami.8b15942

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.8b15942