We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.

Messina, F., Sciortino, L., Buscarino, G., Agnello, S., Gelardi, F., Cannas, M. (2016). Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix. MATERIALS TODAY: PROCEEDINGS, 3, S258-S265 [10.1016/j.matpr.2016.02.043].

Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix

MESSINA, Fabrizio;SCIORTINO, Luisa;BUSCARINO, Gianpiero;AGNELLO, Simonpietro;GELARDI, Franco Mario;CANNAS, Marco
2016-01-01

Abstract

We synthetized carbon dots by a pyrolitic method, and studied their photoluminescence in aqueous environment and upon trapping in a solid matrix. To this aim, we devised a facile procedure allowing to embed the dots in amorphous SiO2, without the need of any pre-functionalization of the nanoparticles, and capable of yielding a brightly photoluminescent monolith. Experimental data reveal a remarkable similarity between the emission properties of carbon dots in water and in SiO2, suggesting that the chromophores responsible of the photoluminescence undergo only weak interactions with the environment. Time-resolved photoluminescence data reveal that the typical photoluminescence tunability of these dots mostly arises, in the present case, from the co-existence of two independent emission bands. These two signals have different emission peak positions (2.8-2.9 and 2.2-2.3 eV respectively) and decay lifetimes (7.0 and 9.0 ns respectively), while their intensity ratio is controlled by the excitation wavelength.
2016
Messina, F., Sciortino, L., Buscarino, G., Agnello, S., Gelardi, F., Cannas, M. (2016). Photoluminescence of Carbon Dots Embedded in a SiO2 Matrix. MATERIALS TODAY: PROCEEDINGS, 3, S258-S265 [10.1016/j.matpr.2016.02.043].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/179375
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