Unraveling exciton processes in Ir(ppy)3:CBP OLED films upon photoexcitation Article Swipe
Stephen K. Sanderson
,
George Vamvounis
,
Alan E. Mark
,
Paul L. Burn
,
Ronald D. White
,
Bronson Philippa
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1063/5.0044177
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1063/5.0044177
Emissive layers in phosphorescent organic light-emitting diodes commonly make use of guest–host blends such as Ir(ppy)3:CBP to achieve high external quantum efficiencies. However, while the Ir(ppy)3:CBP blend has been studied experimentally, crucial questions remain regarding how exciton diffusion is dependent on the distribution of the guest in the host, which can currently only be addressed at the atomic level via computational modeling. In this work, kinetic Monte Carlo simulations are utilized to gain insight into exciton diffusion in Ir(ppy)3:CBP blend films. The effects of both guest concentration and exciton density on various system properties are analyzed, including the probability of singlet excitons being converted to triplets, and the probability of those triplets decaying radiatively. Significantly, these simulations suggest that triplet diffusion occurs almost exclusively via guest–guest Dexter transfer and that concentration quenching of triplets induced by guest–guest intermolecular dipole-dipole interactions has a negligible effect at high exciton densities due to the prevalence of triplet–triplet annihilation. Furthermore, results for vacuum deposited morphologies derived from molecular dynamics simulations are compared to the results obtained using a simple cubic lattice approximation with randomly distributed guest molecules. We show that while differences in host-based processes such as singlet diffusion are observed, overall, the results on the fate of the excitons are in good agreement for the two morphology types, particularly for guest-based processes at low guest concentrations where guest clustering is limited.
Related Topics
Concepts
Exciton
Photoexcitation
Intermolecular force
OLED
Chemical physics
Kinetic Monte Carlo
Dipole
Phosphorescence
Biexciton
Materials science
Quenching (fluorescence)
Molecular physics
Chemistry
Molecule
Monte Carlo method
Nanotechnology
Physics
Fluorescence
Atomic physics
Condensed matter physics
Excited state
Quantum mechanics
Layer (electronics)
Mathematics
Statistics
Organic chemistry
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1063/5.0044177
- https://aip.scitation.org/doi/pdf/10.1063/5.0044177
- OA Status
- bronze
- Cited By
- 13
- References
- 50
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W3158703969
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W3158703969Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1063/5.0044177Digital Object Identifier
- Title
-
Unraveling exciton processes in Ir(ppy)3:CBP OLED films upon photoexcitationWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2021Year of publication
- Publication date
-
2021-04-22Full publication date if available
- Authors
-
Stephen K. Sanderson, George Vamvounis, Alan E. Mark, Paul L. Burn, Ronald D. White, Bronson PhilippaList of authors in order
- Landing page
-
https://doi.org/10.1063/5.0044177Publisher landing page
- PDF URL
-
https://aip.scitation.org/doi/pdf/10.1063/5.0044177Direct link to full text PDF
- Open access
-
YesWhether a free full text is available
- OA status
-
bronzeOpen access status per OpenAlex
- OA URL
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https://aip.scitation.org/doi/pdf/10.1063/5.0044177Direct OA link when available
- Concepts
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Exciton, Photoexcitation, Intermolecular force, OLED, Chemical physics, Kinetic Monte Carlo, Dipole, Phosphorescence, Biexciton, Materials science, Quenching (fluorescence), Molecular physics, Chemistry, Molecule, Monte Carlo method, Nanotechnology, Physics, Fluorescence, Atomic physics, Condensed matter physics, Excited state, Quantum mechanics, Layer (electronics), Mathematics, Statistics, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
- Cited by
-
13Total citation count in OpenAlex
- Citations by year (recent)
-
2025: 3, 2023: 2, 2022: 6, 2021: 2Per-year citation counts (last 5 years)
- References (count)
-
50Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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