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Published (Version of Record)CC BY-NC-ND V4.0, Open Access
Journal article
Reconstructing the 3D Coordinates of Guest: Host OLED Blends with Single Atom Resolution
Small Methods, Vol.8(8), 2301305
2024
Abstract
The performance of electronic and semiconductor devices is critically dependent on the distribution of guest molecules or atoms in a host matrix. One prominent example is that of organic light-emitting diode (OLED) displays containing phosphorescent emitters, now ubiquitous in handheld devices and high-end televisions. In such OLEDs the phosphorescent guest [normally an iridium(III)-based complex] is typically blended into a host matrix, and charge injection and transport, exciton formation and decay, and hence overall device performance are governed by the distribution of the emissive guest in the host. Here high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) is used with depth sectioning to reconstruct the 3D distribution of emissive iridium(III) complexes, fac-tris(2-phenylpyridine)iridium(III) [Ir(ppy)3], blended into the amorphous host material, tris(4-carbazoyl-9-ylphenyl)amine (TCTA), by resolving the position of each single iridium(III) ion. It is found that most Ir(ppy)3 complexes are clustered with at least one other, even at low concentrations, and that for films of 20 wt.% Ir(ppy)3 essentially all the complexes are interconnected. The results validate the morphology of blend films created using molecular dynamics simulations which mimic the evaporation film-forming process and are also consistent with the experimentally measured charge transport and photophysical properties.
Details
- Title
- Reconstructing the 3D Coordinates of Guest: Host OLED Blends with Single Atom Resolution
- Publication Details
- Small Methods, Vol.8(8), 2301305
- Publisher
- Wiley-VCH GmbH
- Identifiers
- 991005649565707891
- Copyright
- © 2024 The Authors
- Murdoch Affiliation
- School of Mathematics, Statistics, Chemistry and Physics
- 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
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- ESI research areas
- Materials Science