Abstract
The structure of tin fluorophosphate glasses and their low melting point properties have attracted a great deal of attention recently, but their own luminescent features have not been well studied. Photoluminescence properties of ultra-low glass transition temperature (<200 °C) tin fluorophosphate glasses with varying SnO/SnF(2) molar ratios at room temperature have been investigated in the present study. Broad photoluminescence in the range from 400 nm to 700 nm, originating from the S(1)-S(0) and T(1)-S(0) transitions of Sn(2+) with the ultra-high concentration (70 mol%), was obtained. And the SnF(2)-SnO-P(2)O(5) glasses exhibited a fast decay lifetime of 2 ns. Both wavelengths of the excitation peak and emission peak depend on the local structure of Sn(2+), which is influenced by different SnO/SnF(2) molar ratios. White light can be generated by appropriately altering the SnO/SnF(2) molar ratios in the SnF(2)-SnO-P(2)O(5) glasses. The ultra-low glass transition temperature SnF(2)-SnO-P(2)O(5) glasses without rare earth elements are a possible candidate for future high white light emission.