Effect of Tb3 concentration in the visible emission of terbium-doped gadolinium oxysulfide microspheres Article uri icon

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. © 2018 Elsevier Masson SAS
  • 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

publication date

  • 2018-01-01