Journal article
Effect of PEDOT:PSS on the performance of solution-processed blue phosphorescent organic light-emitting diodes with an exciplex host
Materials Advances, Vol.2022(3), pp.1055-1063
2022
Abstract
In this study, efficient solution-processed organic light-emitting diodes (OLEDs) based on a light-emitting layer composed of a blue emissive phosphorescent dendrimer and exciplex host were investigated. Employing poly(styrene sulfonic acid) doped poly(ethylenedioxythiophene):poly(styrenesulfonate) (m-PEDOT:PSS) as the hole injection layer resulted in devices with external quantum efficiencies (EQEs) over 20% for luminances of up to 100 cd m−2. A feature of these devices was a relatively slow electroluminescence turn-on for the initial voltage scan, which was absent when m-PEDOT:PSS was replaced with molybdenum oxide as the hole injection layer. The initial turn-on rate was found to decrease with increasing PSSH content, with the results suggesting that proton migration from (m-)PEDOT:PSS is the cause of the change in the device performance. The overall device performance was found to be scan dependent, with sequential voltage scans leading to a decrease in EQE, which is ascribed at least in part to electromer formation. We also demonstrate solution-processed OLEDs with the same exciplex host and bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) as the emitter, that have maximum EQE and power efficiencies of 17.0% and 25.3 lm W−1, respectively.
Details
- Title
- Effect of PEDOT:PSS on the performance of solution-processed blue phosphorescent organic light-emitting diodes with an exciplex host
- Authors/Creators
- J. Saghaei (Author/Creator) - The University of QueenslandM. Koodalingam (Author/Creator) - The University of QueenslandP.L. Burn (Author/Creator) - The University of QueenslandI.R. Gentle (Author/Creator) - The University of QueenslandA. Pivrikas (Author/Creator) - Murdoch UniversityP.E. Shaw (Author/Creator) - The University of Queensland
- Publication Details
- Materials Advances, Vol.2022(3), pp.1055-1063
- Publisher
- Royal Society of Chemistry
- Identifiers
- 991005545435507891
- Copyright
- © 2021 The Authors.
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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