Optical investigation of Eu3+:PbF2 ceramics and transparent glass–ceramics
Optical investigation of Eu3+:PbF2 ceramics and transparent glass–ceramics
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Eu3+:PbF2 陶瓷和透明微晶玻璃的光学研究
DOI：
10.1016/j.optmat.2010.12.024
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Diaf
中科院分区：
文献类型：
--
作者：
C. Bensalem;M. Mortier;D. Vivien;M. Diaf
本文报道了由成分为50 GeO_2 -40 PbO-10 PbF_2-x EuF_3（x=[0.5;1;1.5;2]）的玻璃和成分为100 PbF_2，y EuF_3（y= 5，10，15和20）的多晶陶瓷退火形成的微晶玻璃的光学性质。测量了每种材料的5D 0、5D 1和5D2 Eu ~（3+）能级的光致发光光谱和光致发光寿命。Eu 3+：β-PbF 2纳米微晶在微晶玻璃中的存在被证实，并且完全陶瓷化需要相对于起始玻璃中的PbF 2超过10%的EuF 3。在Eu 3+：β-PbF 2陶瓷和微晶玻璃中，Eu 3+离子取代Pb 2+的规则立方位置，但它们相互作用形成二聚体和更高核度的团簇。这两个物种很容易区分，根据其光致发光衰减率。对于EuF 3速率研究在这里，有没有孤立的Eu 3+离子在PbF 2晶格。对Gd ~（3+）：Eu ~（3+）：β-PbF_2共掺杂陶瓷的光学性质进行了初步研究。结果表明，在陶瓷中形成了Gd ~（3+）-Eu ~（3+）混合二聚体和团簇，并发生了有效的Gd ~（3+）→ Eu ~（3+）能量转移。晶格中的Pb 2+离子也可能参与能量转移过程。
This paper reports an optical investigation of glass–ceramics formed by annealing glasses with compositions 50 GeO2–40 PbO–10 PbF2–x EuF3, x=[0.5;1;1.5;2] and polycrystalline ceramics with composition 100 PbF2, y EuF3, with y=5,10,15 and 20. For each material, the photoluminescence spectrum and the photoluminescence lifetimes of the5D0,5D1and5D2Eu3+levels are measured. Occurrence of Eu3+:β-PbF2nanocrystallites in the glass–ceramics is confirmed and total ceramisation requires more than 10% of EuF3with respect to PbF2in the starting glass. In the Eu3+:β-PbF2ceramics and glass–ceramics, Eu3+ions replace Pb2+in their regular cubic site, but they interact together to form dimers and higher nuclearity clusters. These two species are easily distinguished according to their photoluminescence decay rate. For the EuF3rates investigated here, there are no isolated Eu3+ions in the PbF2lattice. A preliminary investigation of the optical properties of co-doped Gd3+:Eu3+:β-PbF2ceramics was also performed. It shows that mixed Gd3+–Eu3+dimers and clusters are formed, and that efficient Gd3+→Eu3+energy transfer occurs in these ceramics. The Pb2+ions of the lattice may also be involved in the energy transfer process.