The luminescence microspectroscopy of Pr³⁺-doped LiBaAlF₆ and Ba₃Al₂F₁₂ crystals

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• 作者：S.I. Omelkov ; V. Kiisk ; I. Sildos ; M. Kirm ; V. Nagirnyi ; V.A. Pustovarov ; L.I. Isaenko ; S.I. Lobanov
• 关键词：Photoluminescence ; Microspectroscopy ; LiBaAlF6 ; Ba3Al2F12 ; Pr3+ ions
• 刊名：Radiation Measurements
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：56
• 期：Complete
• 页码：49-53
• 全文大小：1257 K

文摘

The combined luminescence and Raman-scattering microspectroscopy technique allows separate spectroscopic studies on several crystal phases in mixed compounds. A mixed sample of LiBaAlF₆ and Ba₃Al₂F₁₂ doped with Pr was studied. The Pr³⁺ concentration was found to be much higher in the Ba₃Al₂F₁₂ phase. Several non-equivalent Pr³⁺ centers are present in both compounds, however, only in Ba₃Al₂F₁₂ there are several non-equivalent crystallographic positions of Ba. In LiBaAlF₆ non-equivalent Pr³⁺ centers appear because of complicated scheme for charge compensation of . Possible reasons of Ba₃Al₂F₁₂ formation in the process of Pr³⁺:LiBaAlF₆ growth are discussed. An excess of LiF in melt is assumed to produce antisite defects as a charge compensation for substitution.