Contribution of resonance energy transfer to the luminescence quenching of upconversion nanoparticles with graphene oxide



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Méndez González, Diego and Gómez Calderón, Óscar and Melle Hernández, Sonia and González Izquierdo, Jesús and Bañares Morcillo, Luis and López Díaz, David and Velazquez Salicio, M. Mercedes and López Cabarcos, Enrique and Rubio Retama, Jorge and Laurenti, Marco (2020) Contribution of resonance energy transfer to the luminescence quenching of upconversion nanoparticles with graphene oxide. Journal of Colloid and Interface Science . ISSN 0021-9797 (In Press)

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Upconversion nanoparticles (UCNP) are increasingly used due to their advantages over conventional fluorophores, and their use as resonance energy transfer (RET) donors has permitted their application as biosensors when they are combined with appropriate RET acceptors such as graphene oxide (GO). However, there is a lack of knowledge about the design and influence that GO composition produces over the quenching of these nanoparticles that in turn will define their performance as sensors. In this work, we have analysed the total quenching efficiency, as well as the actual values corresponding to the RET process between UCNPs and GO sheets with three different chemical compositions. Our findings indicate that excitation and emission absorption by GO sheets are the major contributor to the observed luminescence quenching in these systems. This challenges the general assumption that UCNPs luminescence deactivation by GO is caused by RET. Furthermore, RET efficiency has been theoretically calculated by means of a semiclassical model considering the different nonradiative energy transfer rates from each Er3+ ion to the GO thin film. These theoretical results highlight the relevance of the relative positions of the Er3+ ions inside the UCNP with respect to the GO sheet in order to explain the RET-induced efficiency measurements.

Item Type:Article
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Received 18 February 2020, Revised 31 March 2020, Accepted 19 April 2020, Available online 20 April 2020.

Uncontrolled Keywords:Graphene oxide; Upconversion nanoparticles; Luminescence quenching; Resonance energy transfer (RET); Inner filter effect; Biosensor
Subjects:Sciences > Physics > Chemistry, Physical and theoretical
ID Code:60146
Deposited On:26 Apr 2020 16:56
Last Modified:27 Apr 2020 07:26

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