Rare Earth Ions Doped CaSnO₃Longlasting Phosphors

Long-lasting phosphors (LLPs) are a class of important energy storage materials and have been applied in fields such as lighting sources, displays, fire protection, transportation, building decoration, crafts, instruments and meters and other fields because of its special luminescent and energy store properties. In recent years, longlasting materials have acquired a great development, and rare earth ions doped longlasting phosphors have attracted much attention. Among these luminescent materials, CaSnO3is a stannate with Perovskite structure, and have excellent optical properties, chemical stability, single structure and some other advantages. Rare earth ions doped CaSnO3longlasting phosphors are a focus in longlasting materials field. In this paper, we mainly study the structure, luminescent and afterglow properties of the Tb3+single-doped CaSnO3phosphors, alkali ions (Li+, Na+, K+) and Tb3+co-doped CaSnO3phosphors and Eu3+single-doped CaSnO3phosphors.Tb3+single-doped CaSnO3green longlasting phosphors and alkali ions (Li+, Na+, K+) and Tb3+co-doped CaSnO3green longlasting phosphors were synthesized using the conventional solid-state reaction method. The crystal structures were characterized with XRD. Spectroscopic properties and concentration quenching were characterized with excitation spectra and emission spectra. Through measuring the temperature quenching spectra of the samples, the influence of the temperature on luminescent properties was found. Afterglow properties were also discussed using afterglow decay curves. The thermoluminescence glow curves were also studied, and the order of kinetics, activation energy and frequency factor were calculated. Finally, the influence of doping alkali ions on the luminescent properties of CaSnO3green longlasting phosphors was analyzed.Eu3+single-doped CaSnO3red longlasting phosphors were synthesized using solid-state reaction method. The structure and luminescent properties of the samples were studied. The crystal structures were characterized with XRD. Spectroscopic properties and concentration quenching were characterized with excitation and emission spectra. Through measuring the temperature quenching spectra of the samples, the dependence of the temperature on luminescent properties was studied. By measuring the fluorescence spectra of the samples, the influence of the Eu3+-doping concentration on luminescent properties was analyzed. The lifetime of5Doâ†'7F2level was calculated by using the fluorescent decay curves originating from Eu3+5Doâ†'7F2in CaSnO3and the temperature efficiency was discussed. The wavenumber, radiative rates, lifetime, branching ratios and J-O parameters of the Doâ†'FJ level for CaSnO3:Eu3+phosphors were calculated. Moreover, afterglow properties of the samples were also discussed using afterglow curves. Finally, the influence of Eu3+doping concentration on color coordinates was analyzed.