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A series of Eu 2+ /Ln 3+ (Ln = La-Lu) co-doped SrS phosphors were successfully prepared by a conventional solid-state reaction. Both red persistent luminescence and near-infrared photo-stimulated red luminescence of Eu 2+ was observed in the Eu 2+ single-doped SrS sample benefited from the existence of intrinsic shallow and deep traps. Importantly, different to other Ln 3+ (Ln = La, Ce, Pr, Nd, Gd, Tb, Dy, Er, Ho, Tm, Yb, Lu) codopants, Sm 3+ ions were demonstrated to play an important role in increasing states/densities of deep traps, being beneficial to significantly enhance photo-stimulated red luminescence of Eu 2+ under the excitation of 808/980/1530 nm laser. Finally, persistent decay kinetics under the irradiation of periodically incident near-infrared laser were investigated to reveal the releasing process of electrons captured in the deep traps of Eu 2+ /Sm 3+ :SrS phosphor. [ABSTRACT FROM AUTHOR]

Yb/Tm: YF 3 nanoparticles embedded transparent bulk glass ceramic was successfully prepared to explore its possible application in optical temperature sensors. Specifically, owing to the competition of electron population in the thermally coupled Tm 3+ 3 F 2,3 and 3 H 4 excited states, two upconversion emission bands corresponding to Tm 3+ : 3 F 2,3 → 3 H 6 transition and 1 G 4 → 3 F 4 one exhibited opposite temperature-dependent behaviors, which resulted in monotonous enhancement of the related fluorescence intensity ratio with increase of temperature. As a consequence, Tm 3+ activators in the present YF 3 glass ceramic had advantages of a high sensitivity of 1.84% per K, an avoidable spectral overlapping and a negligible thermal effect for accurate temperature detecting. [ABSTRACT FROM AUTHOR]