A1 Journal article (refereed)
Protonation-induced fluorescence modulation of carbazole-based emitters (2022)

Taipale, E., Durandin, N. A., Salunke, J. K., Candeias, N. R., Ruoko, T.-P., Ward, J. S., Priimagi, A., & Rissanen, K. (2022). Protonation-induced fluorescence modulation of carbazole-based emitters. Materials Advances, 3(3), 1703-1712. https://doi.org/10.1039/d1ma00438g

JYU authors or editors

Publication details

All authors or editors: Taipale, Essi; Durandin, Nikita A.; Salunke, Jagadish K.; Candeias, Nuno R.; Ruoko, Tero-Petri; Ward, Jas S.; Priimagi, Arri; Rissanen, Kari

Journal or series: Materials Advances

eISSN: 2633-5409

Publication year: 2022

Volume: 3

Issue number: 3

Pages range: 1703-1712

Publisher: Royal Society of Chemistry (RSC)

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1039/d1ma00438g

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79321

Abstract

The development of purely organic fluorescence emitters is of great importance for their low cost and high performance. Responding to this demand, carbazole is a promising emitter due to its extensive freedom for functionalisation, high thermal and chemical stability, as well as low cost. Herein, the effect of protonation on the fluorescence of various pyridine-functionalised carbazole-based bipolar host materials was studied both in solution and in the solid-state. The restriction of intramolecular rotation of the molecules upon protonation of the pyridyl-moiety together with easier planarization of the protonated acceptor and the donor moieties and relocalisation of the LUMO orbital on the protonated species was found to increase the fluorescence quantum yield from 16% to 80%. Additionally, in the solid-state, the J-type packing of the molecules further facilitated the increase in the fluorescence quantum yield from 1% to 49%. In both cases, the pronounced bathochromic spectral shift was observed indicating that the gap between the emissive state and the first triplet state of the molecules was diminished upon protonation. Therefore, implementing this strategy could further boost the development of future emitters.

Keywords: supramolecular chemistry; fluorescence; molecules; electrons; organic chemistry

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2022

JUFO rating: 1