DataVXAdvanced Optical MaterialsPaper
journal article·2024-08Open access

Equal Rights for Activators – Ytterbium to Terbium Cooperative Sensitization in Molecular Upconversion

Federico Pini, Richard C. Knighton, Lohona K. Soro, Loïc J. Charbonnière, Marta M. Natile, Niko Hildebrandt

Advanced Optical Materials· Volume 12· Issue 23
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Source abstract

Abstract

Abstract Molecular scaffolds are ideal for investigating upconversion (UC) at the highest spatial resolution and to create precisely controllable luminescent materials. Such control may be the key to overcoming the limitations of brightness and reproducibility found in UC micro‐ and nanoparticles. Cooperative UC can significantly increase luminescence brightness and bulk studies showed that highest efficiencies can be obtained by sensitizer‐to‐activator ion ratios ≥ 2, that is, via high probabilities of sensitizing the emitting lanthanide ion. Using nonanuclear molecular complexes, the authors demonstrate both experimentally and theoretically that interion distances are more relevant and that the highest UC efficiencies are actually attained for sensitizer‐to‐activator ion ratios around 1. By modeling accretive and cooperative sensitization UC, energy migration, and fitting experimental data, it is revealed that cooperative sensitization is predominant for the determination of UC luminescence intensities, whereas energy migration defines UC luminescence kinetics. The implementation of interion distances and different energy transfer mechanisms into advanced modeling of experimental UC data will be paramount for designing brighter and better UC materials.
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Research context

Nanomaterials

OpenAlex topics: Luminescence Properties of Advanced Materials · Radiation Detection and Scintillator Technologies · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Istituto di Chimica della Materia Condensata e Tecnologie per l'Energia (ICMATE) Consiglio Nazionale delle Ricerche (CNR) Padova 35131 Italy

Dipartimento di Scienze Chimiche Università di Padova Padova 35131 Italy

Laboratoire COBRA CNRS INSA Rouen Université de Rouen Normandie Normandie Université Mont‐Saint‐Aignan 76821 France

Equipe de Synthèse pour L'Analyse (SynPA) Institut Pluridisciplaire Hubert Curien (IPHC) UMR 7178 CNRS ECPM Université de Strasbourg 25 rue Becquerel Strasbourg 67087 France

School of Chemistry University of Southampton Southampton SO17 1BJ UK

Department of Chemistry Seoul National University Seoul 08826 South Korea

Department of Engineering Physics McMaster University Hamilton ON L8S4L7 Canada

Funding

National Research Foundation of Korea · Seoul National University · Centre National de la Recherche Scientifique · European Regional Development Fund · Région Normandie · Consiglio Nazionale delle Ricerche · Canada Excellence Research Chairs, Government of Canada · Agence Nationale de la Recherche

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