当前位置: X-MOL 学术Eur. J. Inorg. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Rare‐Earth Germanate Visible, Near‐Infrared, and Up‐Conversion Emitters
European Journal of Inorganic Chemistry ( IF 2.3 ) Pub Date : 2018-04-06 , DOI: 10.1002/ejic.201800153
Duarte Ananias 1 , Filipe A. Almeida Paz 1 , Luís D. Carlos 2 , João Rocha 1
Affiliation  

The hydrothermal synthesis and structural characterization of new trivalent rare‐earth germanates, Na4[(Y1–aLna)2Ge4O13] (Ln = Eu, Tb, or Yb and Er; a = 0.05, 0.1) and Na4[(Yb0.9Er0.1)2Ge4O13] are reported. The structure of these solids was solved by single‐crystal X‐ray diffraction (150 K). The materials crystallize in the orthorhombic non‐centrosymmetric Pna21 space group, and exhibit a framework comprising unprecedented anionic tetrameric [Ge4O13]10– units, tetrameric units of {GeO4} tetrahedra, and isolated dimeric units encompassing two distinct distorted {REO6} octahedra. These rare‐earth germanates feature interesting photoluminescence properties in the visible and near‐infrared spectral regions. Eu3+ photoluminescence confirms the presence of two distinct rare‐earth sites. Energy transfer between the latter sites is shown for the Yb3+/Er3+ pair, both displaying significant near‐infrared emission. Isomorphous Na4[(Yb0.9Er0.1)2Ge4O13] features up‐conversion emission, an unusual property among rare‐earth crystalline germanates.

中文翻译:

稀土锗酸盐可见光,近红外和上转换发射器

新的三价稀土锗酸盐Na 4 [(Y 1– a Ln a2 Ge 4 O 13 ](Ln = Eu,Tb或Yb和Er;a = 0.05、0.1)的水热合成和结构表征报道了Na 4 [(Yb 0.9 Er 0.12 Ge 4 O 13 ]。这些固体的结构通过单晶X射线衍射(150 K)解析。材料在正交各向异性非中心对称Pna 2 1中结晶空间组,并显示出一个框架,该框架包含前所未有的阴离子四聚体[Ge 4 O 13 ] 10-单元,{GeO 4 }四面体的四聚体单元和孤立的二聚体单元,其中包含两个不同的扭曲{REO 6 }八面体。这些稀土锗酸盐在可见光和近红外光谱区域具有有趣的光致发光特性。Eu 3+光致发光证实存在两个不同的稀土位点。对于Yb 3+ / Er 3+对,显示了后面两个位点之间的能量转移,都显示出显着的近红外发射。同构Na 4 [(Yb 0.9 Er0.12 Ge 4 O 13 ]具有上转换发射,这是稀土晶体锗酸盐中的一种不寻常的特性。
更新日期:2018-05-17
down
wechat
bug