[期刊论文]

出版年：2009

The spectroscopic properties of Er³⁺/Yb³⁺ co-doped 50SiO₂–10Al₂O₃–20ZnF₂–20SrF₂ glass and glass ceramic containing SrF₂ nanocrystals were investigated. The formation of SrF₂ nanocrystals in the glass ceramic was confirmed by XRD. The oscillator strengths for several transitions of the Er³⁺ ions in the glass ceramic have been obtained and the Judd–Ofelt parameters were then determined. The XRD result and Judd–Ofelt parameters suggested that Er³⁺ and Yb³⁺ ions had efficiently enriched in the SrF₂ nanocrystals in the glass ceramic. The lifetime of excited states has been used to reveal the surroundings of luminescent Er³⁺ and Yb³⁺ and energy transfer (ET) mechanism between Er³⁺ and Yb³⁺. Much stronger upconversion luminescence and longer lifetime of the Er³⁺/Yb³⁺ co-doped glass ceramic were observed in comparison with the Er³⁺/Yb³⁺ co-doped glass, which could be ascribed to more efficient ET from Yb³⁺ to Er³⁺ due to the enrichment of Yb³⁺ and Er³⁺ and the shortening of the distance between lanthanide ions in the precipitated SrF₂ nanocrystals.

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