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Transparent oxyfluoride glass-ceramics obtained by different sol-gel routes

  • Review Paper: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

Oxyfluoride glass-ceramics (OxGC) present attractive optical properties suitable for many applications. The incorporation of fluoride crystals into silicate matrices improves the luminescence properties, producing materials appropriate for photonic applications. Many papers focus on the preparation of oxyfluoride glass ceramics by melting quenching (MQ), the most widely utilized process. However, in the last decades, the sol-gel process has gained increasing interest as an alternative method for avoiding the MQ drawbacks. The first sol-gel route for producing glass-ceramics with rare earth (RE) doped fluoride nanocrystals were based on the preparation and further mixing of two separate sols. The crystallization of the fluoride nanoparticles occurs during the controlled thermal treatment. More recently, a new sol-gel strategy was proposed, based on the previous synthesis of aqueous fluoride nanoparticles suspensions that are subsequently dispersed in a silica sol-gel matrix. This paper summarizes the most relevant results as well as the advantages and disadvantages of each route and their limitations for future industrial scale up. The synthesis routes are compared considering the structural and morphological characterization, elucidating the crystallization mechanisms, and evaluating the optical properties of the resulting materials. Particular attention is paid to the possibility of producing transparent oxyfluoride glass ceramics films with improved luminescence and enhanced optical properties.

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Acknowledgements

The authors acknowledge financial support from MINECO under projects PID2020-115419GB-C21 (AEI/FEDER, UE). This article is a part of dissemination activities of the project FunGlass, which has received funding from the European Union´s Horizon 2020 research and innovation program under grant agreement No 739566. The authors would like to thank Prof. Rolindes Balda from Física Aplicada, Escuela Superior de Ingeniería, Universidad del País Vasco (UPV-EHU), 48013 Bilbao (Spain) and Centro de Física de Materiales, (UPV/EHU-CSIC), 20018 San Sebastian, Spain and Prof. Joaquin Fernandez from Donostia International Physics Center DIPC, 20018 San Sebastian (Spain) for their collaboration in the characterization and analysis of optical properties.

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  1. Instituto de Cerámica y Vidrio (CSIC), Campus de Cantoblanco, 28049, Madrid, Spain

    María Eugenia Cruz, Yolanda Castro & Alicia Durán

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Cruz, M.E., Castro, Y. & Durán, A. Transparent oxyfluoride glass-ceramics obtained by different sol-gel routes. J Sol-Gel Sci Technol 102, 523–533 (2022). https://doi.org/10.1007/s10971-022-05743-x

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