Effect of Tb3%2b concentration in the visible emission of terbium-doped gadolinium oxysulfide microspheres
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Experimental data obtained from optical characterization of Gd2O2S:Tb3%2b microspheres were compared with a rate-equation model in order to understand and simulate the emission intensity and color tonality as a function of Tb3%2b concentration. The microparticles were prepared by hydrothermal synthesis and characterized by TEM and XRD to confirm spherical microparticles with a hexagonal lattice. Furthermore, fluorescent spectroscopy and rate equation model revealed that the direct energy transfer between Gd3%2b→Tb3%2b ions and the migration of the excitation energy between Tb3%2b play an important role in the luminescence intensity, while the color tonality is mainly governed by the non-radiative relaxation processes between Tb3%2b at low concentrations. Finally, our results suggest that the rate equation model provides an efficient alternative to estimate theoretically the maximum doping concentration in oxysulfides before they present quenching of luminescence. © 2018 Elsevier Masson SAS
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Gadolinium oxysulfide; Luminescence simulation; Microspheres; Rate equations Energy transfer; Gadolinium compounds; Hydrothermal synthesis; Luminescence; Microspheres; Direct energy transfers; Fluorescent spectroscopy; Gadolinium oxysulfides; Luminescence intensity; Non-radiative relaxation; Optical characterization; Rate equations; Spherical micro particles; Terbium compounds
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