Abstract
Red persistent luminescent diopside nanoparticles doped with Mn 2+ and codoped with RE 3+ (Eu 2+ , Dy 3+ ) have been obtained by sol-gel method. The influence of codoping rare earth ions on the persistent luminescence was studied by wavelength-resolved thermally stimulated luminescence (TSL) measurements from 30 to 650 K after X-ray irradiation. From these first results, a mechanism of persistent luminescence is proposed. In this mechanism Mn 2+ and Eu 2+ act as TSL recombination centers, Mn 3+ and Eu 3+ being stable hole centers, whereas Dy 3+ acts as a good electron trap giving rise to a TSL peak at high temperature. Finally, persistent luminescence was measured. Intensity and persistence of the red luminescence of CaMgSi 2 O 6 : Mn 2+ -Dy 3+ are better than those of CaMgSi 2 O 6 : Mn 2+ and CaMgSi 2 O 6 : Mn 2+ -Eu 2+ , which are in agreement with the results of TSL.
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