The Dy,Pr:CeF single crystal was successfully grown and its optical characteristics were investigated systematically. The analysis of energy transfer process between Dy and Pr in CeF crystal was also carried out. The XRD study shows the crystal belongs to the hexagonal crystal system and its lattice parameters are a = 7.1252 Å and c = 7.2775 Å. The maximum phonon energy of the crystal was speculated to be 377.1 cm by Raman spectrum. The absorption coefficient at 442 nm of Dy,Pr:CeF crystal is 0.89 cm. The radiative lifetime of Dy:F level is 2.08 ms and the one of Pr:P level is 145.25 μs in Dy,Pr:CeF crystal obtained by J-O theory calculation. The maximum emission cross-section of Dy: F → H transition is calculated to be ∼0.15 × 10 cm in the crystal. The fluorescence lifetimes of Dy:F, Pr:P and Pr:D levels are estimated to be ∼1.25 ms, ∼17.91 μs and ∼112.37 μs, respectively. The results show that Dy,Pr:CeF crystal not only owns a larger absorption coefficient at 442 nm than Dy:CeF crystal, but also holds the much longer lifetime of Pr:P level than Pr:CeF crystal because of the energy transfer in Dy-Pr.

中文翻译：

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CeF3晶体中掺杂Dy3+-Pr3+离子的光学特性及能量传递分析

成功生长了Dy,Pr:CeF单晶并系统研究了其光学特性。还对CeF晶体中Dy和Pr之间的能量传递过程进行了分析。 XRD研究表明该晶体属于六方晶系，其晶格参数为a = 7.1252 Å和c = 7.2775 Å。通过拉曼光谱推测该晶体的最大声子能量为377.1 cm。 Dy,Pr:CeF晶体在442 nm处的吸收系数为0.89 cm。通过JO理论计算得到Dy,Pr:CeF晶体中Dy:F能级的辐射寿命为2.08 ms，Pr:P能级的辐射寿命为145.25 μs。经计算，晶体中 Dy: F → H 跃迁的最大发射截面为 ∼0.15 × 10 cm。 Dy:F、Pr:P 和 Pr:D 水平的荧光寿命估计分别为~1.25 ms、~17.91 μs 和~112.37 μs。结果表明，Dy,Pr:CeF晶体不仅在442 nm处比Dy:CeF晶体具有更大的吸收系数，而且由于Dy中的能量转移，Pr:P能级的寿命也比Pr:CeF晶体长得多。 -Pr。