Visible quantum cutting through downconversion in KLiGdF5:Eu3+ crystals
Visible quantum cutting through downconversion in KLiGdF5:Eu3+ crystals
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DOI：
10.1063/1.2135893
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发表时间：
2005-11
影响因子：
3.2
通讯作者：
N. Kodama;S. Oishi
中科院分区：
文献类型：
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作者：
N. Kodama;S. Oishi
KLiGdF5:Eu3+ (KLGF:Eu3+) 中的 Gd3+–Eu3+ 对观察到通过下转换的可见量子切割。在这种基于 Gd3+ 的氟化物中，可见光量子切割（即每个吸收光子发射两个可见光光子）是在 GJ6 能级上的 Gd3+ 真空紫外激发时发生的，通过交叉弛豫和剩余激发能的顺序转移从 Gd3+ 到 Eu3+ 的两步能量转移。从Eu3+的能量转移概率和D05发射的衰减行为等方面讨论了可见光量子切割所需的交叉弛豫效率对Eu3+掺杂浓度的依赖性，发现掺杂2at.%Eu3+的KLGF晶体表现出最大交叉弛豫效率为0.4。根据 Gd3+ 离子周围最近邻居的数量和 D05 发射强度，确定在量子切割过程中从激发的 Gd3+ 离子的能量转移延伸到第四个最近的 Eu3+ 邻居。
Visible quantum cutting through downconversion is observed for the Gd3+–Eu3+ couple in KLiGdF5:Eu3+ (KLGF:Eu3+). In this Gd3+-based fluoride, visible quantum cutting, the emission of two photons of visible light per absorbed photon, occurs upon vacuum ultraviolet excitation of Gd3+ at the GJ6 level via two-step energy transfer from Gd3+ to Eu3+ by cross relaxation and sequential transfer of the remaining excitation energy. The dependence of the efficiency of cross relaxation required for visible quantum cutting on the Eu3+ doping concentration is discussed in terms of the probability of energy transfer and the behavior of decay of the D05 emission of Eu3+, and it is found that the KLGF crystal doped with 2at.% Eu3+ exhibits the maximum cross-relaxation efficiency of 0.4. From the number of nearest neighbors around Gd3+ ions and the D05 emission intensity, energy transfer from excited Gd3+ ions is determined to extend to the fourth-nearest Eu3+ neighbors in the quantum cutting process.