Transition Metals (Cr3+) and Lanthanides (Eu3+) in Inorganic Glasses with Extremely Different Glass-Formers B2O3 and GeO2.

Karolina Kowalska,Wojciech A Pisarski,Joanna Pisarska,Justyna Polak,Marta Kuwik

doi:10.3390/ma14237156

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.

Highlights

Introduction and AJavier Sanchez-HerenciaIn recent years, the field of engineering materials has evolved, introducing new information about the interesting properties of systems [1,2,3]
The present paper presents the correlation between the content of two different glass-network formers (GeO2 and B2 O3 ) and the spectroscopic properties of inorganic glasses singly doped with transition metal ions (Cr3+ ) and lanthanide ions (Eu3+ )
GeO2 -B2 O3 -BaO-Ga2 O3 glass systems singly doped with transition metals (Cr3+ ) and lanthanides (Eu3+ ) were prepared by high-temperature meltquenching method

Summary

Introduction

Introduction and AJavier Sanchez-HerenciaIn recent years, the field of engineering materials (including glasses) has evolved, introducing new information about the interesting properties of systems [1,2,3]. In an excellent communication [5], Zanotto and Mauro declared that a comprehensive definition of glass, combining the aspect of knowledge improvement and modernity, is still being explored. To this day, the technology to prepare glass is based on substances such as SiO2 , B2 O3 , GeO2 , P2 O5 , which are the only ones that meet. A variety of modifications in the chemical composition of glasses enables the introduction of different optically active ions such as transition metal and rare-earth ions. This allows obtaining unique luminescent properties and developing new optical materials operating in a wide spectral range. Jiao et al [16] presented that increasing the boron oxide ratio visibly improves the luminescence characterizations of Sm3+ , Dy3+ , and Tb3+

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