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Oxyfluoride glass-ceramic fibers doped with Nd3+: structural and optical characterization

Abstract

Transparent oxyfluoride glass-ceramic fibers containing LaF3 nano-crystals have been drawn using the single crucible method and crystallization after a proper heat treatment. Optical fibers have been obtained a posteriori through the deposition of a SiO2 cladding prepared by sol-gel and deposited by dip-coating. A detailed thermal and structural characterization performed by DTA, XRD, HRTEM and SAXS showed the same features obtained for bulk glass-ceramic materials of the same composition. Phase separation, due to fluorine immiscibility in an oxide glass matrix, acts as precursor of the crystallization. The crystallization mechanism is a diffusion-controlled process and the local compositional changes of the glass matrix around the nano-crystals limit the crystal size to 10-20 nm depending on the treatment conditions. The optical characterization demonstrated the light propagation into the glass-ceramic core and the possibility to selectively excite Nd3+ ions in the fluoride nano-crystals with a corresponding increase of the luminescence efficiency.

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Publication details

The article was received on 28 Jul 2017, accepted on 26 Sep 2017 and first published on 26 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01380A
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Oxyfluoride glass-ceramic fibers doped with Nd3+: structural and optical characterization

    G. Gorni, R. Balda, J. Fernandez, I. Iparraguirre, J. Velazquez, Y. Y. Castro, L. Pascual, G. Chen, M. Sundararajan, M. J. Pascual and A. Durán, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01380A

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