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Title: Transition metals (Cr3+) and lanthanides (Eu3+) in inorganic glasses with extremely different glass-formers B2O3 and GeO2
Authors: Kowalska, Karolina
Kuwik, Marta
Polak, Justyna
Pisarska, Joanna
Pisarski, Wojciech A.
Keywords: glasses; network-former; luminescence properties; red-emittingmaterials; paramagnetic ions
Issue Date: 2021
Citation: "Materials" (2021), iss. 23, art. no. 7156, s. 1-15
Abstract: Glasses containing two different network-forming components and doped with optically active ions exhibit interesting properties. In this work, glass systems based on germanium dioxide and boron trioxide singly doped with lanthanides (Eu3+) and transition metals (Cr3+) ions are research subjects. Optical spectroscopy was the major research tool used to record excitation and emission spectra in a wide spectral range for studied systems. The emitted radiation of glasses doped with Cr3+ ions is dominated by broadband luminescence centered at 770 nm and 1050 nm (4T2 ! 4A2). Interestingly, the increase of concentration of one of the oxides contributed to the detectable changes of the R-line (2E ! 4A2) of Cr3+ ions. Moreover, EPR spectroscopy confirmed the paramagnetic properties of the obtained glasses. The influence of molar ratio GeO2:B2O3 on spectroscopic properties for Eu3+ ions is discussed. The intensity of luminescence bands due to transitions of trivalent europium ions as well as the ratio R/O decrease with the increase of B2O3. On the other hand, the increase in concentration B2O3 influences the increasing tendency of luminescence lifetimes for the 5D0 state of Eu3+ ions. The results will contribute to a better understanding of the role of the glass host and thus the prospects for new optical materials.
DOI: 10.3390/ma14237156
ISSN: 1996-1944
Appears in Collections:Artykuły (WNŚiT)

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