Abstract
In this work we report the infrared to visible upconversion processes in Nd-doped fluoroarsenate glasses that produce green, orange, and red emissions together with the dynamics of the 4F 3/2 state. The visible emissions can be attributed to transitions from the 4G 7/2 excited state populated by energy transfer upconversion (ETU). It was found that ETU processes involving two Nd 3+ ions in the 4F 3/2 state reduce the energy storage capacity through the reduction of the fluorescence lifetimes of the 4F 3/2 state. From the analysis of the temporal evolution of the infrared emission from the 4F 3/2 state we have estimated the macroscopic ETU parameter for the samples studied.
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