Logo de 22nd International Symposium on Bioluminescence and Chemiluminescence & 20th International Symposium on Luminescence Spectroscopy
Wait a moment for the page to load

Enter your credentials

Fechar janela

Sign up

Forgot your password?

Logo 22nd ISBC & 20th ISLS


Luminescence spectroscopy of macromolecules and biomolecules

Influence of vibrational quenching on NIR lanthanide luminescence and strategies to reduce it in lanthanide molecular materials

Dimitrije Mara1, Silvia Bonabello1, Rik V. Deun2, Luca Pilia3, Flavia Artizzu1

1LumiMol, Department of Sustainable Development and Ecological Transition (DISSTE), University of Eastern Piedmont “A. Avogadro”, piazza S. Eusebio 5, 13100, Vercelli, Italy, 2L3 – Luminescent Lanthanide Lab, Department of Chemistry, Ghent University, Krijgslaan 281 – S3, B-9000, Ghent, Belgium, 3Department of Chemical, Mechanical and Materials Engineering, University of Cagliari, via Marengo 2, 09123, Cagliari, Italy.

E-mail: mara.dimitrije@uniupo.it

Near-infrared (NIR) lanthanide luminescent molecular materials are of interest for their wide applications such as lasers, optical telecommunication, bioimaging, quantum technologies. Due to the forbidden nature of the f-f transitions, it is difficult to directly excite lanthanide ions due to their low molar absorption coefficients. To overcome this problem, organic molecules are used to form molecular complexes, where the organic moiety acts as an antenna, absorbing light and undergoing energy transfer to nearby lanthanide ion. On the other hand, the gain of a more efficient excitation of lanthanide ions comes at the cost of having shorter emission lifetimes and lower quantum yields as a consequence of vibrational quenching phenomena by strong oscillators such as C-H and O-H groups present in the coordination environment. First, we will present a quantitative study of vibrational quenching in a series of NIR-luminescent beta-diketonate complexes. We elucidate the influence of the number, orientation and donor-acceptor distance of C-H and O-H groups on quenching and propose a semi-empirical predictive model based on the Förster’s resonance energy transfer (FRET) theory of general validity for NIR-emitting lanthanide complexes. Second, we propose the use of 3d complexes as metalloligands to afford d-f heterometallic molecular materials. This strategy allows for reducing the proximity of the high energy oscillators such as C-H, N-H and O-H groups to the lanthanide center and, at the same time, obtain efficient dual emitters in the Visible and NIR region thanks to the combined properties of transition metal and lanthanide ions.

Keywords: Lanthanide, NIR, Luminescence, Quenching

Acknowledgments: European Innovation Council EIC Pathfinder project “ARTEMIS” G. A. n. 101115149.

Search for submitted abstracts

You can select one or more search filters