Structural and Optical Properties of Erbium and Ytterbium Codoped Germanoniobophosphate Glasses

Abstract

A series of glasses with compositions of 20Na2O–30Nb2O5–(5−y−z)Al2O3–30P2O5–(15−x)TiO2–xGeO2–yEr2O3–zYb2O3, where x = (0; 5; 10; 15), y = (0; 1), z = (0; 2) mol%, were investigated with respect to their structural, optical, and luminescence properties. The coordination of the germanium(IV) ion is normally reported as being mainly tetrahedral. However, results of this study suggest that the germanium(IV) ion may have an octahedral coordination and that TiO2 is substituted. This proposition can be done mainly by 31P MAS‐NMR spectroscopy, which spectra show predominantly pyrophosphate chains in the different glasses, without changes in their polymerization after substitution. A similar coordination of germanium can also be identified by the photoluminescence behavior of the different codoped samples, which shows similar erbium(III) emission decay lifetimes (5 ms), and Judd–Ofelt intensity parameters. It was found that the upconversion emission process involved 1.5 photons. Regarding the thermal behavior, it is noted that the glasses containing higher proportions of GeO2 exhibit higher thermal stability and are therefore more resistant to devitrification when compared to compositions containing more TiO2.

Novel Multicomponent Titanate-Germanate Glasses: Synthesis, Structure, Properties, Transition Metal, and Rare Earth Doping

“…In particular, luminescence spectra and decay curves were examined for glass samples, where germanium dioxide was substituted by titanium dioxide and the relative molar ratio of these two main glass-former components is equal to GeO 2 :TiO 2 = 1:1. In previous work TiO 2 was substituted by GeO 2 in multicomponent germanoniobophosphate glass system allowing the glass stabilization against devitrification and the improvement of photoluminescence behavior, but amount of titanium dioxide playing the role as glass-network modifier did not exceed 15 molar % [ 27 ].…”

Praseodymium ion doped phosphate glasses for integrated broadband ion-exchanged waveguide amplifier

“…In order to expand the bandwidth and increase the population distribution of specific energy levels, some RE 3+ co-doped schemes such as Er 3+ /Yb 3+ , Tm 3+ /Er 3+ , Tm 3+ /Yb 3+ , Er 3+ /Nd 3+ and Ho 3+ /Er 3+ [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been explored. However, the favorable doping host is low-phonon glasses such as sulfide, halide, tellurite and heavy-metal oxide glasses, which are almost impossible to fabricate the channel waveguide devices unless special equipment and complicated technique are employed.…”

Crystal Growth of F‐Phlogopite from Glasses of the SiO2–Al2O3–MgO–K2O–F System

“…The microstructure of F‐phlogopite‐based glass‐ceramics is characterized by cross‐linked mica flakes that are immersed in a residual glass matrix . The microstructure is an important factor to control the design of glass‐ceramics materials because most mechanical and optical properties are related to this feature, and it can promote or diminish the characteristics of glass‐ceramics …”