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Ordering of fluorite-type phases in erbium-doped oxyfluoride glass ceramics
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2017-09-01 , DOI: 10.1016/j.jeurceramsoc.2017.08.037
Guna Krieke , Anatolijs Sarakovskis , Maris Springis

In this study, novel transparent Er3+ doped glass ceramics were prepared from melt-quenched oxyfluoride glasses with general composition of Na2O-NaF-BaF2-YbF3-Al2O3-SiO2. The crystallization of fluorite (BaF2, BaF2-YbF3, NaF-BaF2-YbF3 and Na0.5-xYb0.5+xF2+2x) and distorted fluorite (rhombohedral Ba4Yb3F17 and tetragonal NaF-BaF2-YbF3) phases was analysed in glass ceramics with different BaF2 and YbF3 ratio. The phase composition and microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Intense red upconversion luminescence (UCL) was detected under near-infrared excitation resulting from three photon upconversion followed by cross-relaxation between Er3+ and Yb3+ ions.

The local environment of Er3+ ions in fluorite and distorted phases was analysed using site-selective spectroscopy. The Er3+ ions were found to act as nucleation centres in the glass ceramics containing BaF2. The phase transition from metastable fluorite to rhombohedrally and tetragonally distorted fluorite phases was detected using Er3+ ions as a probe.



中文翻译:

掺er氟氧化物玻璃陶瓷中萤石型相的有序化

在这项研究中,新型的透明Er 3+掺杂的玻璃陶瓷是由具有Na 2 O-NaF-BaF 2 -YbF 3 -Al 2 O 3 -SiO 2的一般组成的熔融淬火的氟氧化物玻璃制成的。萤石(BaF 2,BaF 2 -YbF 3,NaF-BaF 2 -YbF 3和Na 0.5-x Yb 0.5 + x F 2 + 2x)和扭曲的萤石(菱形Ba 4 Yb 3 F 17和四方NaF- BaF 2 -YbF 3在具有不同BaF 2和YbF 3比率的玻璃陶瓷中分析相。通过X射线衍射(XRD)和扫描电子显微镜(SEM)研究了相组成和微观结构。在三个光子上转换然后在Er 3+和Yb 3+离子之间交叉松弛后产生的近红外激发下检测到强烈的红色上转换发光(UCL)。

使用位点选择性光谱法分析了萤石和扭曲相中Er 3+离子的局部环境。发现Er 3+离子在含有BaF 2的玻璃陶瓷中起成核中心的作用。使用Er 3+离子作为探针检测了从亚稳态萤石到菱形和四方扭曲萤石相的相变。

更新日期:2017-09-01
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