Elucidating the effects of guest-host energy level alignment on charge transport in phosphorescent OLEDs

Sanderson, Stephen, Philippa, Bronson, Vamvounis, George, Burn, Paul L., and White, Ronald D. (2019) Elucidating the effects of guest-host energy level alignment on charge transport in phosphorescent OLEDs. Applied Physics Letters, 115. 263301.

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Abstract

The correct choice of guest and host molecules in the light-emitting layer is essential for developing high performance phosphorescent organic light emitting devices. However, the effects of the energy level alignment between the guest and the host are yet to be fully elucidated. In this Letter, we use kinetic Monte Carlo simulations to investigate guest-host systems in which the energy gap of the guest and host is fixed, and only the relative energies of the ionization potential/electron affinity are changed to elucidate their effect on charge transport. It was determined that the mobility balance in the blend was sensitive to the energy level alignment, allowing balanced active layer mobility to be achieved despite the hole and electron mobilities being different by around one order of magnitude. It was also found that the mobility of the faster carrier was more sensitive to the energy level alignment than that of the slower carrier due to reduced slower carrier thermalization under deep charge trapping on the guest.

Item ID: 61355
Item Type: Article (Research - C1)
ISSN: 1077-3118
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Copyright Information: © 2019 Author(s). Published under license by AIP Publishing.
Funders: Australian Government Research Training Program, Australian Research Council (ARC)
Projects and Grants: ARC FL160100067
Date Deposited: 07 Jan 2020 23:03
FoR Codes: 02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020403 Condensed Matter Modelling and Density Functional Theory @ 100%
SEO Codes: 85 ENERGY > 8507 Energy Conservation and Efficiency > 850799 Energy Conservation and Efficiency not elsewhere classified @ 100%
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