Abstract 1 at% Dy3+: CaF2 and 1 at% Dy3+/5 at% Y3+: CaF2 crystals were grown by Bridgman method. Absorptions, visible and mid-infrared emissions, and fluorescence decay curves were measured. By applying Judd-Ofelt (J-O) theory, for Dy3+/Y3+: CaF2 crystal stronger oscillator strength and radiation transition probability were derived. The effect of Y3+ ions incorporation into CaF2 crystals on the light emission of Dy3+ ions was discussed. Co-doped Y3+ ions can destroy Dy clusters, cripple the concentration quenching effect, and enhance the yellow and mid-infrared fluorescence intensity. The yellow fluorescence intensity of Dy3+/Y3+: CaF2 is ~ 70 times higher than that of Dy3+: CaF2 crystal. The local structure of Dy3+ ions was analyzed, and co-doping Y3+ can increase the quantity of tetragonal Dy clusters. In Dy3+/Y3+: CaF2 crystal, the tetragonal Dy clusters occupy the dominant position, and the fluorescence lifetime (τf) is relatively short. It can be concluded that Dy3+: CaF2 and Dy3+/Y3+: CaF2 crystals are expected to achieve yellow and mid-infrared laser output simultaneously.

中文翻译：

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Dy3+: CaF2 和 Dy3+/ Y3+: CaF2 晶体的可见光和中红外光谱性能

摘要 1 at% Dy3+: CaF2 和 1 at% Dy3+/5 at% Y3+: CaF2 晶体通过 Bridgman 方法生长。测量了吸收、可见光和中红外发射以及荧光衰减曲线。应用Judd-Ofelt (JO)理论，推导出Dy3+/Y3+:CaF2晶体更强的振子强度和辐射跃迁概率。讨论了 Y3+ 离子掺入 CaF2 晶体对 Dy3+ 离子发光的影响。共掺杂的 Y3+ 离子可以破坏 Dy 簇，削弱浓度猝灭效应，增强黄色和中红外荧光强度。Dy3+/Y3+:CaF2 的黄色荧光强度比 Dy3+:CaF2 晶体高约 70 倍。分析了Dy3+离子的局部结构，共掺杂Y3+可以增加四方Dy簇的数量。在 Dy3+/Y3+：CaF2 晶体中，四方Dy簇占据主导地位，荧光寿命（τf）相对较短。可以得出结论，Dy3+:CaF2和Dy3+/Y3+:CaF2晶体有望同时实现黄光和中红外激光输出。