Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

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

Saghaei, J., Brewer, A.M., Jiang, W., Russell, S.M., Burn, P.L. and Pivrikas, A. (2021) 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. Thin Solid Films, 718 . Art. 138475.

Link to Published Version: https://doi.org/10.1016/j.tsf.2020.138475
*Subscription may be required

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.

Item Type: Journal Article
Murdoch Affiliation(s): Chemistry and Physics
Publisher: Elsevier BV
Copyright: © 2020 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/59235
Item Control Page Item Control Page