Eu3+ probe ion for rare-earth dopant site structure in sol–gel derived LiYF4 oxyfluoride glass–ceramic
| Autor: | M. Secu, R.F. Negrea, C.E. Secu |
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| Rok vydání: | 2013 |
| Předmět: |
Glass-ceramic
Photoluminescence Materials science Dopant Organic Chemistry Doping Inorganic chemistry Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Inorganic Chemistry Nanocrystal law Physical chemistry Crystallite Electrical and Electronic Engineering Physical and Theoretical Chemistry Crystallization Spectroscopy Sol-gel |
| Zdroj: | Optical Materials. 35:2456-2460 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2013.06.053 |
| Popis: | Sol–gel route using metal alkoxides and trifluoroacetic acid as precursors has been used to prepare oxyfluoride glass–ceramic containing Eu 3+ -doped LiYF 4 nanocrystals of about tens of nm size embedded in a silica matrix through controlled crystallization at higher temperatures of the xerogel. Photoluminescence spectra and decay curves recorded in the Eu 3+ -doped LiYF 4 polycrystalline pellet and glass ceramic have been discussed using group-theoretical arguments. In the glass–ceramic Eu 3+ ions are embedded dominantly inside the LiYF 4 nanocrystals most probably as Eu–O center and/or dimer centers in low symmetry ( C 2 v ) sites; oxygen ions were incorporated in their neighborhood during the glass ceramization. |
| Databáze: | OpenAIRE |
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