Vacuum ultraviolet 5d¹4f⁹-4f¹⁰ emission of Ho³⁺ ions in alkaline-earth fluorides

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• 作者：E.A. Radzhabov ; V. Nagirnyi ; A.I. Nepomnyashchikh
• 关键词：Rare-earth ions ; Ho3+ ; Vacuum ultraviolet ; Luminescence ; Time-resolved ; Multiphonon relaxation ; Alkaline-earth fluorides
• 刊名：Radiation Measurements
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：56
• 期：Complete
• 页码：76-79
• 全文大小：612 K

文摘

Time-resolved emission and excitation spectra as well as emission decay kinetics of CaF₂, SrF₂, BaF₂ doped with HoF₃ were investigated. Intensive emission bands near 168?nm, having long decay time, are caused by the spin-forbidden transitions from the 5d¹4f⁹ high-spin states to the ground ⁵I₈ states of Ho³⁺ ions. Weak spin allowed 5d¹4f⁹(low-spin)-4f¹⁰ emission band at 158?nm was observed only in CaF₂-Ho crystals. Spin allowed and spin-forbidden excitation bands were observed near 166 and 155?nm, respectively, in all studied crystals. Fast component of spin-forbidden emissions due to multiphonon relaxation to low-lying 4f¹⁰ Ho³⁺ level also was observed for all crystals.