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.

doi:10.1039/c8tc02936a

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.

Authors

Heather F. Higginbotham

Piotr H. Pander

Renata Rybakiewicz

Marc K. Etherington

Subashani Maniam

Malgorzata Zagorska

Adam Pron

Przemyslaw Data

Andrew P. Monkman

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., …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