Abstract
Luminescence emission of Tm 3+ in YAG codoped with Cr 3+ under selective (into 2 E Cr 3+ levels or 3 F 3 Tm 3+ levels) and nonselective (into 4 T 2 Cr 3+ level) excitation is dominate by three new centers. Based on structural and spectral characteristics, these centers are associated with the three possible perturbations produced by Cr 3+ ions at the nearest neighbour Tm 3+ ions. A selective energy transfer within these Cr 3+ -Tm 3+ pairs is observed
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