Exploring the Phase-Selective,Green, Hydrothermal Synthesis of Upconverting Doped Sodium Yttrium Fluoride: Effects of Temperature,Time, and Precursors |
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Authors: | Nora Jannsen Dr Stefano Diodati Nicola Dengo Francesca Tajoli Dr Nicola Vicentini Dr Giacomo Lucchini Prof Adolfo Speghini Prof Denis Badocco Prof Paolo Pastore Prof Silvia Gross |
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Institution: | 1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131 Padova, Italy
Institute of Inorganic and Applied Chemistry, University of Hamburg, 20146 Hamburg, Germany;2. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131 Padova, Italy;3. NRG, Dipartimento of Biotecnologie, Università di Verona and INSTM, RU Verona, Strada Le Grazie 15, 37314 Verona, Italy |
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Abstract: | The aim of this work was i) to develop a hydrothermal, low-temperature synthesis protocol affording the upconverting hexagonal phase NaYF4 with suitable dopants while adhering to the “green chemistry” standards and ii) to explore the effect that different parameters have on the products. In optimizing the synthesis protocol, short reaction times and low temperatures (below 150 °C) were considered. Yb3+ and Er3+ ions were chosen as dopants for the NaYF4 material. Within the context of the second goal, parameters including nature of the precursors, treatment temperature, and treatment time were investigated to afford a pure hexagonal crystalline phase, both in the doped and undoped materials. To fully explore the synthesis results, the prepared materials were characterized from a structural (XRD), compositional (XPS, ICP-MS), and morphological (SEM) point of view. The upconverting properties of the compounds were confirmed by photoluminescence measurements. |
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Keywords: | doping fluoride hydrothermal synthesis low-temperature synthesis upconversion |
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