Ekdal E, Garcia Guinea J, Karabulut Y, Canimoglu A, Harmansah C, Jorge A, Karali T, Can N
Ege University, Institute of Nuclear Sciences, 35100 Bornova, Izmir, Turkey.
Museo Nacional Ciencias Naturales, Jose Gutierrez Abascal 2, Madrid 28006, Spain.
Appl Radiat Isot. 2015 Sep;103:93-9. doi: 10.1016/j.apradiso.2015.05.023. Epub 2015 May 29.
In this study, structural and luminescence properties of magnesium borate of the form MgB4O7 doped with Tm and Na were investigated by X-ray diffraction (XRD), Raman spectroscopy and cathodoluminescence (CL). The morphologies of the synthetised compounds exhibit clustered granules and road-like materials. As doping trivalent ions into a host with divalent cations requires charge compensation, this effect is discussed. The CL spectra of undoped MgB4O7 shows a broad band emission centred around 350 nm which is postulated to be produced by self-trapped excitons and some other defects. From the CL emission spectrum, main emission bands centred at 360, 455, 475 nm due to the respective transitions of (1)D2→(3)H6,(1)D2→(3)F4 and (1)G4→(3)H6 suggest the presence of Tm(3+) ion in MgB4O7 lattice site. CL mechanism was proposed to explain the observed phenomena which are valuable in possibility of the developing new luminescent materials for different applications. In addition, the experimental Raman spectrum of doped and undoped MgB4O7 were reported and discussed.
在本研究中，通过X射线衍射（XRD）、拉曼光谱和阴极发光（CL）对掺杂Tm和Na的MgB4O7形式的硼酸镁的结构和发光特性进行了研究。合成化合物的形态呈现出聚集颗粒和棒状材料。由于将三价离子掺杂到具有二价阳离子的主体中需要电荷补偿，因此对这种效应进行了讨论。未掺杂的MgB4O7的CL光谱显示出以350nm为中心的宽带发射，据推测这是由自陷激子和其他一些缺陷产生的。从CL发射光谱来看，由于（1）D2→（3）H6、（1）D2→（3）F4和（1）G4→（3）H6的各自跃迁，以360、455、475nm为中心的主要发射带表明MgB4O7晶格位点中存在Tm(3+)离子。提出了CL机制来解释观察到的现象，这些现象对于开发用于不同应用的新型发光材料的可能性具有重要价值。此外，还报道并讨论了掺杂和未掺杂的MgB4O7的实验拉曼光谱。
