Effect of Tb3+ concentration in the visible emission of terbium-doped gadolinium oxysulfide microspheres
Abstract
Experimental data obtained from optical characterization of Gd2O2S:Tb3+ 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+ 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+→Tb3+ ions and the migration of the excitation energy between Tb3+ play an important role in the luminescence intensity, while the color tonality is mainly governed by the non-radiative relaxation processes between Tb3+ 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.
- Publication:
-
Solid State Sciences
- Pub Date:
- October 2018
- DOI:
- 10.1016/j.solidstatesciences.2018.07.021
- Bibcode:
- 2018SSSci..84....8H
- Keywords:
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- Gadolinium oxysulfide;
- Rate equations;
- Luminescence simulation;
- Microspheres