Wednesday 6 October 2021
Time: 1pm in QLD 2pm in NSW, ACT, Vic, and Tas
11am in WA
12:30pm in NT
1:30pm in SA
4pm in New Zealand
Each talk is 20 minutes duration followed by approximately 5 minutes for questions and discussion.
Time (QLD time, adjust as needed)
1:00 – 1:25pm
Rivers of light – ternary exciplex blends for high efficiency solution-processed red phosphorescent organic light emitting diodes
Jaber Saghaei,1 Steven M. Russell,1 Hui Jin,1 Paul L. Burn,1* Almantas Pivrikas2, Paul E. Shaw1
1Centre for Organic Photonics & Electronics (COPE), School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
2School of Engineering and Information Technology, Murdoch University, Perth, Western Australia, 6150, Australia
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 we describe 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. Solution-processed OLEDs containing an annealed emissive layer with a low dendrimer concentration (2 wt%) were found to have the best performance, which was higher than the device in which the light emitting layer was not annealed. The improvement in performance of the annealed device was 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 had maximum current, power and external quantum efficiencies of 17.9 cd/A, 19.4 lm/W, and 14.8±0.6%, respectively. The fact that the maximum EQE of 14.8% was larger than that expected based on the PLQY and the normal out-coupling efficiency of 20% from a bottom-emitting devices was determined to arise from the different pathways of exciton formation under photoexcitation and charge injection.
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Please be aware that the talks will be recorded and posted on the AUCAOS website.
Previous seminars can be viewed here: https://seminars.aucaos.org.au/
Call for abstracts:
Seminars are typically held on the first Wednesday of each month.
At this time we are specifically encouraging HDR students to present their work to broad audience. If you are interested in speaking then please submit an abstract to firstname.lastname@example.org.