Preserving the work function of Ultra-Violet-ozone treated indium tin oxide by triarylamine-based small molecule modification for solution-processed organic light-emitting diodes with increased external quantum efficiency

J. Saghaei; A.M. Brewer; W. Jiang; S.M. Russell; P.L. Burn; A. Pivrikas

doi:10.1016/j.tsf.2020.138475

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Preserving the work function of Ultra-Violet-ozone treated indium tin oxide by triarylamine-based small molecule modification for solution-processed organic light-emitting diodes with increased external quantum efficiency

Journal article

Peer reviewed

Preserving the work function of Ultra-Violet-ozone treated indium tin oxide by triarylamine-based small molecule modification for solution-processed organic light-emitting diodes with increased external quantum efficiency

J. Saghaei, A.M. Brewer, W. Jiang, S.M. Russell, P.L. Burn and A. Pivrikas

Thin Solid Films, Vol.718, Art. 138475

2021

DOI: https://doi.org/10.1016/j.tsf.2020.138475

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Abstract

UV-ozone treatment is one of the most common ways to increase the work function of indium tin oxide (ITO), which is used as the transparent conducting anode in organic light-emitting diodes (OLEDs). However, the work function increase is time sensitive when the samples are left or processed in air, often returning to a similar value to that measured before UV-ozone treatment. We found that for OLEDs formed by solution processing and containing a poly(ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole injection layer that there was no advantage in terms of device efficiency of using UV-ozone treated ITO. However, if a triarylamine-based small molecule [N1,N3,N5-tris(4-n-butylphenyl)-N1,N3,N5-triphenylbenzene-1,3,5-triamine, 4-n-BTDAB] was introduced onto the UV-ozone treated ITO then the work function was stabilised. When 4-n-BTDAB was introduced between UV-ozone treated ITO and PEDOT:PSS, the resultant solution processed OLEDs were found to have a maximum external quantum efficiency ≈20% higher (corresponding to an absolute increase of ≈2% to around 12%) compared to devices with the same structure but without the triarylamine layer.

Details

Title: Preserving the work function of Ultra-Violet-ozone treated indium tin oxide by triarylamine-based small molecule modification for solution-processed organic light-emitting diodes with increased external quantum efficiency
Authors/Creators: J. Saghaei (Author/Creator) - The University of Queensland
A.M. Brewer (Author/Creator) - The University of Queensland
W. Jiang (Author/Creator) - The University of Queensland
S.M. Russell (Author/Creator) - The University of Queensland
P.L. Burn (Author/Creator) - The University of Queensland
A. Pivrikas (Author/Creator) - Murdoch University
Publication Details: Thin Solid Films, Vol.718, Art. 138475
Publisher: Elsevier BV
Identifiers: 991005540354007891
Copyright: © 2020 Elsevier B.V.
Murdoch Affiliation: 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: Materials Science, Coatings & Films; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
ESI research areas: Materials Science