Optical study of ions environments in fluorochlorozirconate and fluorobromozirconate glasses

Abstract

Some manganese doped fluorozirconate, fluorochloro- and fluorobromozirconate glasses have been prepared following and improving some standard methods. Electron probe microanalysis has been carried out to obtain the actual composition of the samples. The optical properties of ions, including steady state excitation and emission, and luminescence decay have been studied. Values of the crystal field and Racah parameters have been estimated from the excitation data. The results have been interpreted in terms of the progressive substitution of the fluorine ions in the first coordination shell of by chlorine or bromine ions. A concentration of about 6 at.% of chlorines or bromines with respect to the total number of halide ions is enough to have most of the ions coordinated to only chlorines or bromines.

Lanthanides in Non-Oxide Glasses

“…The optical properties of Pr 3+ ions have been studied in various fluoride glasses based on zirconium, 44,45 indium, 46,47 or zinc fluorides. 46,48 Pr 3+ -doped fluoride glasses are efficient emitters in the visible with strong emissions in the blue, green, and red domains from the ( 3 P 0 , 3 P 1 ) levels as shown in Figure 5. These levels can be excited by various up-conversion mechanisms, that is, with light at 588 nm into the 1 D 2 level followed by a crossrelaxation or by means of two-step excited state absorption (ESA) mechanisms involving two different wavelengths.…”

“…The optical properties of Pr 3+ ions have been studied in various fluoride glasses based on zirconium, , indium, , or zinc fluorides. , …”

Structural investigation of fluorophosphate glasses by 19F, 31P MAS-NMR and IR spectroscopy

“…Optical transmission is restricted to the visible spectrum because the electronic transitions of Mn 2+ cations in octahedral ligand field lead to strong UV absorption [22,23]. It is limited to 4.5 μm in the mid-infrared by the first overtone of the P\O vibrations as this has been shown in fluoride glasses doped with phosphates [24].…”

Fluorophosphate glasses containing manganese

“…The UV absorption edge is shifted towards longer wavelength as MnF 2 concentration increases. Curves show one shoulder at 350 nm and two absorption bands located around 400 and 500 nm that correspond to transitions of Mn 2+ ions in octahedral sites [12,13].…”

“…Optical transmission is restricted to the visible spectrum because the electronic transitions of Mn 2+ cations in octahedral ligand field lead to strong UV absorption [12,13]. It is limited to 4.5 micrometers in the mid-infrared by the first overtone of the P-O vibrations, as this has been shown in fluoride glasses doped with phosphates [14,15,29].…”