Abstract
Metaphosphate glasses doped with five concentrations of ions have been investigated through absorption and emission spectra, decay curves, and upconversion measurements. Judd–Ofelt parameters have been evaluated from absorption spectrum of the -doped glass, which are in turn used to predict radiative properties of some important luminescence levels of ions in these glasses. Gain bandwidths of an optical amplifier have been evaluated and are compared with those of reported :glass systems. Temperature dependence of the emission has been studied for the -doped glass from to room temperature. Lifetimes of the level were measured and are found to decrease with concentration of ions after . Concentration quenching of lifetimes has been analyzed using the theory developed by Auzel et al. [J. Lumin. 94–95, 293 (2001) ; Opt. Mater. 24, 103 (2003) ]. Infrared to visible upconversion was also measured for three concentrations of -doped metaphosphate glasses with excitation. A mechanism, involving excited state absorption and energy transfer upconversion, has been proposed to explain the upconversion process.
© 2007 Optical Society of America
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