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Energy level diagram of and showing the mechanism for the cooperative energy transfer from a UV-excited ion to two ions that relax by NIR emission.
Emission spectra of the singly doped Eu glasses under 325 nm excitation at room temperature. Spectra of both as-prepared and various heat-treated glasses are shown. The broad peak around 350–500 nm is ascribed to , whereas the sharp peaks from 575 to 725 nm are ascribed to . Inset: area under the broad peak as a function of heat-treatment temperature .
Emission spectra of the codoped Eu–Yb glasses under 325 nm excitation at room temperature. Spectra of both as-prepared and various heat-treated glasses are shown. The broad peak around 350–500 nm is ascribed to , the sharp peaks from 575 to 725 nm to , and the peaks in the NIR region to . Inset (a): excitation spectrum monitored at 985 nm of the as-prepared codoped Eu–Yb glass (solid curve) and the same glass heat-treated at (dashed curve). Inset (b): luminescence decay curves of emission under 325 nm excitation of Eu and Eu–Yb doped glasses heat-treated at .
(a) SNMS depth profile of the codoped Eu–Yb glass heat-treated at . The curves are plotted as concentration of the element at a given depth divided by the concentration of the same element in the bulk of the glass . Inset: depth of calcium diffusion (closed squares) and Vickers hardness (open squares) as a function of heat-treatment temperature . of the as-prepared glass is . (b) XPS spectra of O from the as-prepared and heat-treated codoped Eu–Yb glasses. The solid lines are the experimental data, whereas the dashed and dashed-dotted lines are the fit to the BO and NBO components, respectively. The peaks were deconvoluted using Gaussian functions.
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