Spectral-kinetic studies of SrAlF₅ doped by trivalent rare-earth ions

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• 作者：A.N. Yunusova ; M.A. Marisov ; V.V. Semashko ; L.A. Nurtdinova ; S.L. Korableva
• 关键词：Laser spectroscopy ; Color centers ; Rare-earth ions ; UV active media ; Fluoride crystals
• 刊名：Optics Communications
• 出版年：2012
• 出版时间：15 August, 2012
• 年：2012
• 卷：285
• 期：18
• 页码：3832-3836
• 全文大小：633 K

文摘

Photochemical properties of Ce³⁺:SrAlF₅ and Ce³⁺,Yb³⁺:SrAlF₅ single crystals together with spectroscopic and kinetic characteristics of several optically nonequivalent impurity centers and energy transfer between them are described. It is shown that co-activation by Yb³⁺ ions effectively suppresses color centers in Ce,Yb:SAF crystals. It was found out that in Ce,Yb:SAF crystals Yb ions exist simultaneously in 2+ and 3+ valent state. Three types of optically nonequivalent luminescent centers corresponding to the doublets in luminescence spectrum centered at 290, 305 and 370 nm (Ce^I, Ce^II, Ce^III, respectively) have been observed. Analysis of luminescence spectra and decays leads to the conclusion that there is no energy transfer between either cerium centers or from Ce³⁺ to Yb²⁺ apart from the Ce^III center which luminescence is slightly quenched by Yb²⁺.