Glass-Ceramic Materials with Luminescent Properties in the System ZnO-B 2 O 3 -Nb 2 O 5 -Eu 2 O 3 .

In this paper, the crystallization behavior of 50ZnO:47B 2 O 3 :3Nb 2 O 3 :0.5Eu 2 O 3 (G-0 h) glass has been investigated in detail by DSC, XRD and TEM analysis. The luminescent properties of the resulting glass-ceramics were also investigated. By XRD and TEM analysis, crystallization of several crystalline phases has been proved (α-Zn 3 B 2 O 6 , β-Zn 3 B 2 O 6 and ZnNb 2 O 6 ). By calculating crystal parameters, it was found that europium ions are successfully incorporated in the β-Zn 3 B 2 O 6 . Photo-luminescent spectra showed increased emission in the resulting glass-ceramic samples compared to the parent glass sample due to higher asymmetry of Eu 3+ ions in the obtained crystalline phases. It was established that the optimum emission intensity is registered for glass-ceramic samples obtained after 25 h heat treatment of the parent glass.