The photon upconversion based on triplet–triplet annihilation (TTA) is a mechanism that converts the absorbed low-energy electromagnetic radiation into higher energy photons also at extremely low excitation intensities, but its use in actual technologies is still hindered by the limited availability of efficient annihilator moieties. We present here the results obtained by the synthesis and application of two new fluorinated chromophores based on phenazine and acridine structures, respectively. Both compounds show upconverted emission demonstrating their ability as TTA annihilator. More interesting, the acridine-based chromophore shows an excellent TTA yield that overcomes the one of some of best model systems. By correlating the experimental data and the quantum mechanical modeling of the investigated compound, we propose an alternative efficient pathway for the generation of the upconverted emissive states involving the peculiar high-energy triplet levels of the dye, thus suggesting a new development strategy for TTA annihilators based on the fine tuning of their high-energy excited states properties.

Vaghi, L., Rizzo, F., Pedrini, J., Mauri, A., Meinardi, F., Cosentino, U., et al. (2022). Bypassing the statistical limit of singlet generation in sensitized upconversion using fluorinated conjugated systems. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES [10.1007/s43630-022-00225-z].

Bypassing the statistical limit of singlet generation in sensitized upconversion using fluorinated conjugated systems

Vaghi, Luca
Primo
;
Pedrini, Jacopo;Meinardi, Francesco;Cosentino, Ugo;Greco, Claudio;Monguzzi, Angelo
;
Papagni, Antonio
2022

Abstract

The photon upconversion based on triplet–triplet annihilation (TTA) is a mechanism that converts the absorbed low-energy electromagnetic radiation into higher energy photons also at extremely low excitation intensities, but its use in actual technologies is still hindered by the limited availability of efficient annihilator moieties. We present here the results obtained by the synthesis and application of two new fluorinated chromophores based on phenazine and acridine structures, respectively. Both compounds show upconverted emission demonstrating their ability as TTA annihilator. More interesting, the acridine-based chromophore shows an excellent TTA yield that overcomes the one of some of best model systems. By correlating the experimental data and the quantum mechanical modeling of the investigated compound, we propose an alternative efficient pathway for the generation of the upconverted emissive states involving the peculiar high-energy triplet levels of the dye, thus suggesting a new development strategy for TTA annihilators based on the fine tuning of their high-energy excited states properties.
Articolo in rivista - Articolo scientifico
Acridines; Fluorinated chromophores; Phenazines; Photon upconversion; Triplet–triplet annihilation;
English
Vaghi, L., Rizzo, F., Pedrini, J., Mauri, A., Meinardi, F., Cosentino, U., et al. (2022). Bypassing the statistical limit of singlet generation in sensitized upconversion using fluorinated conjugated systems. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES [10.1007/s43630-022-00225-z].
Vaghi, L; Rizzo, F; Pedrini, J; Mauri, A; Meinardi, F; Cosentino, U; Greco, C; Monguzzi, A; Papagni, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/374092
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