Journal article
Balanced hole and electron transport in Ir(ppy)3: TCTA blends
ACS Photonics, Vol.8(8), pp.2425-2430
2021
Abstract
Balanced charge injection and transport in organic light-emitting diodes (OLEDs) is essential for highly efficient devices with small efficiency roll-off at high luminance. However, there are few reports on the measurement of charge mobility within the emissive blend layer of an OLED. In this paper, we show that photoexcitation in conjunction with Metal–Insulator–Semiconductor Charge Extraction with Linearly Increasing Voltage (photo-MIS-CELIV) can be used to determine the hole and electron mobilities of the emissive blend layer in a single device architecture. We demonstrate the technique by studying the commonly used emissive blend of fac-tris[2-phenylpyridinato-C2,N]iridium(III) [Ir(ppy)3] and tris(4-carbazoyl-9-ylphenyl)amine (TCTA), as well as neat TCTA and Ir(ppy)3 films. It was found that Ir(ppy)3 and its blend films with TCTA have measurable electron mobilities and critically they are of similar magnitude as their hole mobilities, irrespective of the Ir(ppy)3 doping ratio. Such balanced charge mobility suggests that the transport of both holes and electrons occurs mostly on the Ir(ppy)3 guest molecules in the blend. Additionally, we demonstrate that photo-MIS-CELIV can be used to measure the quantum efficiency of exciton dissociation in organic semiconductor thin films.
Details
- Title
- Balanced hole and electron transport in Ir(ppy)3: TCTA blends
- Authors/Creators
- M. Gao (Author/Creator) - The University of QueenslandP.L. Burn (Author/Creator) - The University of QueenslandA. Pivrikas (Author/Creator) - Murdoch University
- Publication Details
- ACS Photonics, Vol.8(8), pp.2425-2430
- Publisher
- ACS Publications
- Identifiers
- 991005541115307891
- Copyright
- © 2021 American Chemical Society
- 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, Multidisciplinary
- Nanoscience & Nanotechnology
- Optics
- Physics, Applied
- Physics, Condensed Matter
- ESI research areas
- Physics