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Interfacial TADF exciplex as a tool to localise excitons, improve efficiency and increase OLED lifetime.

Colella, Marco and Pander, Piotr Henryk and Pereira, Daniel De Sa and Monkman, Andrew P. (2018) 'Interfacial TADF exciplex as a tool to localise excitons, improve efficiency and increase OLED lifetime.', ACS applied materials & interfaces., 10 (46). pp. 40001-40007.


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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher 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
Date accepted:01 November 2018
Date deposited:06 November 2018
Date of first online publication:01 November 2018
Date first made open access:01 November 2019

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