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Título

Synthesis of highly transparent Er-doped fluorotellurite glass-ceramics through controlled crystallization

AutorMorea, Roberta ; Fernández, T. T. ; Fernández, Joaquín ; Balda, Rolindes ; Gonzalo, J.
Fecha de publicación12-jun-2016
CitaciónICOOPMA (2016)
ResumenWe present a detailed study of the preparation, microstructure and photoluminescence response of transparent Er-doped GCs obtained from a TeO2¿ ZnO¿ ZnF2 fluorotellurite glass doped with ErF3. The determination of nucleation and crystal growth rate-like curves [2,3] allowed us to establish a narrow temperature range (340-350 ºC) for a controlled crystallization. Thereafter, two-step heat treatments were carried out to nucleate a GC phase: 10-20 hours at a temperature slightly above the glass transition temperature, followed by a 2.5-3 hours treatment at 340 ºC. The resulting material remained highly transparent. Transmission Electron Microscopy and Energy Dispersive X-ray spectroscopy showed the nucleation of ErF3 nanocrystals (NCs) with a typical size of ¿50 nm that were homogeneously distributed in the glass matrix. The crystalline to amorphous ratio was ¿ 1%; yet the presence of ErF3 NCs has a large impact on the PL response of Er3+ ions in the produced GC. 4I13/2 ¿ 4I15/2 transition (1.52 ¿m) presents a more resolved and narrower emission band in the GC, while the 4I13/2 decay can be described by two single exponential functions having a shorter lifetime than in the precursor glass, which suggests that Er3+ ions are distributed both in the NCs and in the glass matrix. In addition, hypersensitive transitions 2H11/2, 4S3/2 ¿ 4I15/2 (522 nm and 544 nm) were analyzed under 980 nm laser excitation. 2H11/2 band remained almost unchanged, whereas major changes were observed for the 4S3/2 band emission with respect to the glass sample; thus, indicating that the local site symmetry is least affected compared to the coordination environment. Stark splitting in the case of the 4S3/2 band confirmed the presence of Er3+ in sites with lower phonon energy. Finally, red emission from the 4F9/2 level is dramatically enhanced with respect the green one from 2H11/2 and 4S3/2 levels, which is most likely due to co-operative energy transfer between Er3+ ions eased by the shorter inter-ionic distances in the NCs.
Descripción7th International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Polytechnique Montréal (Canadá), June 12-17, 2016
URIhttp://hdl.handle.net/10261/154891
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