Triphenylamine disubstituted naphthalene diimide: elucidation of excited states involved in TADF and application in near-infrared organic light emitting diodes

Higginbotham, Heather F.; Pander, Piotr H.; Rybakiewicz, Renata; Etherington, Marc K.; Maniam, Subashani; Zagorska, Malgorzata; Pron, Adam; Data, Przemyslaw; Monkman, Andrew P.

Abstract

It is demonstrated that naphthalene diimide core disubstituted with triphenylamine can be used as a Thermally Activated Delayed Fluorescence emitter in Organic Light Emitting Diodes. Detailed spectroscopic studies demonstrated unusual host effects on the photophysical properties of this material. In particular, we were able to deduce recombination pathways and the role of the host and temperature in increasing/decreasing the TADF contribution in overall emission. Further, stemming from these host effects on the geometry of the emitter we discover different local triplet states involved in TADF mechanism. We elucidate this confusing situation to show that simply measuring low-temperature phosphorescence does not always give the energy of the local triplet involved in TADF. The studies carried out in non-polar polymer and the OLED host were completed by the NIR OLED fabrication showing promising characteristics.

Citation

Higginbotham, H. F., Pander, P. H., Rybakiewicz, R., Etherington, M. K., Maniam, S., Zagorska, M., Pron, A., Data, P., & Monkman, A. P. (2018). Triphenylamine disubstituted naphthalene diimide: elucidation of excited states involved in TADF and application in near-infrared organic light emitting diodes. Journal of Materials Chemistry C Materials for optical and electronic devices, 6(30), 8219-8225. https://doi.org/10.1039/c8tc02936a

• Journal Article Type: Article
• Acceptance Date: Jun 30, 2018
• Online Publication Date: Jul 4, 2018
• Publication Date: Aug 14, 2018
• Deposit Date: Jul 10, 2018
• Publicly Available Date: Jun 30, 2019
• Journal: Journal of Materials Chemistry C Materials for optical and electronic devices
• Print ISSN: 2050-7526
• Electronic ISSN: 2050-7534
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 30
• Pages: 8219-8225
• DOI: https://doi.org/10.1039/c8tc02936a
• Public URL: https://durham-repository.worktribe.com/output/1326542