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Realizing 20% External Quantum Efficiency in Electroluminescence with Efficient Thermally Activated Delayed Fluorescence from an Exciplex

Chapran, Marian; Pander, Piotr Henryk; Vasylieva, Marharyta; Wiosna-Sałyga, Gabriela; Ulanski, Jacek; Dias, Fernando B.; Data, Przemyslaw

Realizing 20% External Quantum Efficiency in Electroluminescence with Efficient Thermally Activated Delayed Fluorescence from an Exciplex Thumbnail


Authors

Marian Chapran

Piotr Henryk Pander

Marharyta Vasylieva

Gabriela Wiosna-Sałyga

Jacek Ulanski

Przemyslaw Data



Abstract

Herein we report the investigation of non-doped exciplex formed in blends of 2,4,6-Tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), working as the one-electron acceptor molecule, with different electron donors. The emission of these exciplexes spans from blue to orange-red, and shows clear contribution from thermally activated delayed fluorescence (TADF). We focus our studies on the properties of TADF in these systems, covering the physical meaning of the different transient components observed in the luminescence decays of these blends. Our results unravel the intricate role of reverse intersystem crossing due to spin-orbit coupling and hyperfine interactions and internal conversion, which affect the efficiency of the TADF mechanism. Organic light-emitting diodes fabricated with these blends show in some cases remarkable performances. Green exciplex blends, in particular, exhibited the current efficiency of 60 cd A-1, power efficiency of 71 lm W-1 and external quantum efficiency of 20%. We believe our results will contribute significantly to highlight the potential advantages of intermolecular exciplexes in the area of organic light-emitting diodes.

Citation

Chapran, M., Pander, P. H., Vasylieva, M., Wiosna-Sałyga, G., Ulanski, J., Dias, F. B., & Data, P. (2019). Realizing 20% External Quantum Efficiency in Electroluminescence with Efficient Thermally Activated Delayed Fluorescence from an Exciplex. ACS Applied Materials and Interfaces, 11(14), 13460-13471. https://doi.org/10.1021/acsami.8b18284

Journal Article Type Article
Acceptance Date Mar 13, 2019
Online Publication Date Mar 13, 2019
Publication Date Apr 10, 2019
Deposit Date Mar 20, 2019
Publicly Available Date Mar 13, 2020
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 14
Pages 13460-13471
DOI https://doi.org/10.1021/acsami.8b18284
Public URL https://durham-repository.worktribe.com/output/1334979

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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.8b18284






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