Emissive material optimization for solution-processed exciplex OLEDs

J. Saghaei; T. Leitner; V.T.N. Mai; C.S.K. Ranasinghe; P.L. Burn; I.R. Gentle; A. Pivrikas; P.E. Shaw

doi:10.1021/acsaelm.1c00630

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Emissive material optimization for solution-processed exciplex OLEDs

Journal article

Peer reviewed

Emissive material optimization for solution-processed exciplex OLEDs

J. Saghaei, T. Leitner, V.T.N. Mai, C.S.K. Ranasinghe, P.L. Burn, I.R. Gentle, A. Pivrikas and P.E. Shaw

ACS Applied Electronic Materials, Vol.3(11), pp.4757-4767

2021

DOI: https://doi.org/10.1021/acsaelm.1c00630

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Abstract

Exciplex or charge transfer blends can be emissive in a similar manner to thermally activated delayed fluorescent materials but without the requirement for covalent linkages. Exciplex blends have been mainly used in organic light-emitting diodes fabricated using thermal evaporation, which is in part due to the poor film forming properties of evaporable materials when processed from solution. In this paper, we report the synthesis of three oxadiazole derivatives designed to have good solubility and compare the properties with commercial 1,3-bis[2-(4-t-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene (OXD-7). The acceptor materials have 4-(2-ethylhexyloxy)phenyl or 9,9-di-n-alkylfluoren-2-yl (where the alkyl groups are either n-propyl or n-hexyl) end groups as opposed to the 4-t-butylphenyl moieties of OXD-7. Neat films of the synthesized oxadiazole derivatives were found to have electron mobilities an order of magnitude higher than that of OXD-7. The oxadiazole derivatives were found to be miscible with the hole transporting 4,4′,4″-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA) with charge transfer emission from solution-processed films. The 4-(2-ethylhexyloxy)phenyl-oxadiazole derivative exhibited the best overall performance when blended with m-MTDATA, with the solution-processed films having a photoluminescence quantum yield of around 21 ± 3% and simple bilayer OLEDs having a maximum external quantum efficiency of 5.3 ± 0.3%.

Details

Title: Emissive material optimization for solution-processed exciplex OLEDs
Authors/Creators: J. Saghaei (Author/Creator) - The University of Queensland
T. Leitner (Author/Creator) - The University of Queensland
V.T.N. Mai (Author/Creator) - The University of Queensland
C.S.K. Ranasinghe (Author/Creator) - The University of Queensland
P.L. Burn (Author/Creator) - The University of Queensland
I.R. Gentle (Author/Creator) - The University of Queensland
A. Pivrikas (Author/Creator) - Murdoch University
P.E. Shaw (Author/Creator) - The University of Queensland
Publication Details: ACS Applied Electronic Materials, Vol.3(11), pp.4757-4767
Publisher: ACS Publications
Identifiers: 991005540328707891
Copyright: © 2021 American Chemical Society
Murdoch Affiliation: School of Mathematics, Statistics, Chemistry and Physics
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.114 Organic Semiconductors; 2.114.321 OLEDs
Web Of Science research areas: Engineering, Electrical & Electronic; Materials Science, Multidisciplinary
ESI research areas: Materials Science