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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
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Abstract

It is demonstrated that a 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. Furthermore, stemming from these host effects on the geometry of the emitter we discover different local triplet states involved in the 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 a non-polar polymer and the OLED host were completed by NIR OLED fabrication showing promising characteristics.

Original languageEnglish
Pages (from-to)8219-8225
Number of pages7
JournalJournal of Materials Chemistry C
Volume6
Issue number30
Early online date4 Jul 2018
DOIs
Publication statusPublished - 3 Aug 2018

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