Crystallization and upconversion luminescence of distorted fluorite nanocrystals in Ba²⁺ containing oxyfluoride glass ceramics

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• 作者：Guna Krieke ; ^{guna.krieke@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Anatolijs Sarakovskis
• 关键词：Upconversion ; Luminescence ; Ba4Y3F17 ; Er3+ ; Transparent glass ceramics ; Oxyfluoride ; Rare-earth
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：36
• 期：7
• 页码：1715-1722
• 全文大小：2841 K

文摘

In this study novel Er³⁺-doped transparent glass ceramics were prepared from melt-quenched glasses with general composition of Na₂O-NaF-BaF₂-YF₃-Al₂O₃-SiO₂. The phase composition of the annealed glass ceramics strongly depends on the BaF₂ content in glass matrix. Crystallization of β-NaYF₄, cubic fluorite type, tetragonal nanocrystals and rhombohedral Ba₄Y₃F₁₇ was observed. An introduction of BaF₂ in the glass matrix suppresses the crystallization of β-NaYF₄, promotes the formation of Ba²⁺ containing fluoride phases and reduces the cross-relaxation between Er³⁺ ions in fluoride crystals. Small rate of the nonradiative processes and low local symmetry of rhombohedrally disordered Ba₄Y₃F₁₇ enables an efficient upconversion luminescence surpassing that of the glass ceramics containing β-NaYF₄ nanocrystals.