Abstract K5GdLi2F10 compound doped with Tb3+ and Eu3+ was synthetized. The excited states of these lanthanide ions were analyzed up to VUV range at 125,000 cm−1 (80 nm). Strong coupling between terbium and europium was found. The energy transfer processes from terbium to europium mainly depend on fast migration. The lifetime of 5D4 multiplet in the presence of europium is shorter by about 30% in comparison to singly doped terbium compounds. The character of the decay curve of the 5D4 multiplet is mono-exponential. Non-exponential character was discovered in the case of 5D1 europium multiplet in the presence of terbium. The nature of this quenching was determined to be dipole-dipole interaction with critical distance 9.96 A. The energy transfer is temperature dependent.

中文翻译：

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合金和化合物杂志 K5GdLi2F10:Tb、Eu 的 VIS-VUV 光谱和从铽到铕的温度激活能量转移

摘要 合成了掺杂Tb3+和Eu3+的K5GdLi2F10化合物。这些镧系元素离子的激发态在 125,000 cm-1 (80 nm) 的 VUV 范围内进行了分析。发现铽和铕之间存在强耦合。从铽到铕的能量转移过程主要依赖于快速迁移。与单掺杂铽化合物相比，在铕存在下 5D4 多重态的寿命缩短约 30%。5D4多重峰衰减曲线的特征是单指数的。在铽存在的情况下，在 5D1 铕多重峰的情况下发现了非指数特征。这种猝灭的性质被确定为临界距离为 9.96 A 的偶极-偶极相互作用。能量转移取决于温度。