Rivers of light—Ternary exciplex blends for high efficiency solution‐processed red phosphorescent organic light emitting diodes

J. Saghaei; S.M. Russell; H. Jin; P.L. Burn; A. Pivrikas; P.E. Shaw

doi:10.1002/adfm.202108128

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Rivers of light—Ternary exciplex blends for high efficiency solution‐processed red phosphorescent organic light emitting diodes

Journal article

Peer reviewed

Rivers of light—Ternary exciplex blends for high efficiency solution‐processed red phosphorescent organic light emitting diodes

J. Saghaei, S.M. Russell, H. Jin, P.L. Burn, A. Pivrikas and P.E. Shaw

Advanced Functional Materials, Vol.32(8), 2108128

2022

DOI: https://doi.org/10.1002/adfm.202108128

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Abstract

Red-emitting organic light-emitting diodes (OLEDs) are important for displays and lighting, with the latter benefiting from solution processable materials, which would enable low embedded energy, scalable fabrication. Herein, the effect of annealing and phase separation on the performance of solution-processed OLEDs incorporating a light-emitting layer composed of the exciplex host, m-MTDATA:OXD-7, and a red phosphorescent light-emitting dendrimer, Ir(tDCpq)3, is described. Solution-processed OLEDs containing an annealed emissive layer with a low dendrimer concentration (2 wt%) are found to have the best performance, which is higher than the device in which the light-emitting layer is not annealed. The improvement in the performance of the annealed device is ascribed to improved charge mobility within the emissive layer caused by phase separation of the OXD-7. The OLEDs containing annealed m-MTDATA:OXD-7:(2 wt%) Ir(tDCpq)3 have maximum current, power, and external quantum efficiencies of 17.9 cd A−1, 19.4 lm W−1, and 14.8 ± 0.6%, respectively. The fact that the maximum external quantum efficiency (EQE) of 14.8% is larger than that expected based on the photoluminescence quantum yield (PLQY) and the normal out-coupling efficiency of 20% from a bottom-emitting device is determined to arise from the different pathways of exciton formation under photoexcitation and charge injection.

Details

Title: Rivers of light—Ternary exciplex blends for high efficiency solution‐processed red phosphorescent organic light emitting diodes
Authors/Creators: J. Saghaei (Author/Creator) - The University of Queensland
S.M. Russell (Author/Creator) - The University of Queensland
H. Jin (Author/Creator)
P.L. Burn (Author/Creator) - The University of Queensland
A. Pivrikas (Author/Creator) - Murdoch University
P.E. Shaw (Author/Creator) - The University of Queensland
Publication Details: Advanced Functional Materials, Vol.32(8), 2108128
Publisher: John Wiley & Sons Ltd.
Identifiers: 991005543706807891
Copyright: © 2021 Wiley-VCH GmbH
Murdoch Affiliation: School of Engineering and Information Technology
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: Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics, Applied; Physics, Condensed Matter
ESI research areas: Materials Science