Effect of Tb3+ concentration in the visible emission of terbium-doped gadolinium oxysulfide microspheres

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...

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Bibliographic Details
Published in:Solid state sciences 2018-10, Vol.84, p.8-14
Main Authors: Hernandez-Adame, Luis, Palestino, Gabriela, Meza, Octavio, Hernandez-Adame, Pablo Luis, Vega-Carrillo, Hector Rene, Sarhid, Iyad
Format: Article
Language:English
Subjects:
Chemical Sciences
Gadolinium oxysulfide
Luminescence simulation
Microspheres
Rate equations
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Summary: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. [Display omitted] •The rate equation model can simulate the visible emission and concentration quenching of luminescence.•The mechanism of quenching traps was found the main route that affect the emission intensity and color tonality.•For high Tb3+ concentrations, the green emission is dominant, but for low concentrations, the violet-blue increase.
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2018.07.021