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Thermal stability and photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in bulk and fiber-optic silica glass
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SYSNO ASEP 0543295 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thermal stability and photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in bulk and fiber-optic silica glass Author(s) Vařák, Petr (URE-Y)
Mrázek, Jan (URE-Y) RID, ORCID
Jasim, Ali (URE-Y)
Bysakh, S. (IN)
Dhar, A. (IN)
Kamrádek, Michal (URE-Y)
Podrazký, Ondřej (URE-Y) RID
Kašík, Ivan (URE-Y) RID
Bartoň, Ivo (URE-Y) ORCID, RID
Nekvindová, P. (CZ)Number of authors 10 Article number 111239 Source Title Optical Materials. - : Elsevier - ISSN 0925-3467
Roč. 118, August (2021)Number of pages 12 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Photoluminescence ; Optical fiber ; Silica glass ; Alumina ; Rare-earth ions ; Mullite Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-03141S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support URE-Y - RVO:67985882 UT WOS 000674490100003 DOI 10.1016/j.optmat.2021.111239 Annotation We present the thermal stability and the photoluminescence properties of RE-doped (RE = Ho, Er, Tm) alumina nanoparticles in the phase system Al2O3-SiO2 with respect to the chemical composition and the thermal processing conditions applied in the fiber-optic technology. The alumina and silica soot reacted together to form mullite when the Al2O3 concentration was higher than 5 mol. %. We have demonstrated that the solubility limits of RE ions in the mullite nanocrystals are strongly limited. The RE ions preferentially occupy highly disordered positions on the nanoparticle surface or in the amorphous Al3+-enriched shell around the nanoparticles, exhibiting maximal lifetime of approx. 1.2 ms, 10.0 ms and 0.6 ms in the Ho-, Er- and Tm-doped samples. Rapid cooling of the samples with stoichiometric composition 3Al2O3·2SiO2 managed to prepare highly defective mullite nanocrystals with embedded RE ions, exhibiting promising photoluminescence lifetimes of 5.6 ms and 2.4 ms in the case of Ho3+ and Tm3+ ions, respectively. In optical fibers with 5 mol. % Al2O3, the formation of amorphous Al3+-enriched nanoparticles was observed and the photoluminescence lifetime was in a good agreement with corresponding bulk samples. Exploitation of the RE-doped stoichiometric mullite in the fiber-optic technology may be a perspective way to improve the photoluminescence efficiency of active optical fibers for high-power applications Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.optmat.2021.111239
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