Abstract
We report a persistent phosphor of KY3(1−x)Tb3xF10 (KY3F10:xTb3+) synthesized by solid-state reaction for x-ray or cathode-ray tubes. The phosphorescence consists of a group of blue and green emission lines originating from D53→F7J and D54→F7J transitions of Tb3+, respectively. The phosphorescent emitting color can be tuned from blue to green by gradually increasing Tb3+ concentrations, which is attributed to the enhanced D53-D54 relaxation through the cross relaxation between two Tb3+ ions, as described by of (D53,F76)-(D54,F70). The Tb3+ concentration dependent phosphorescence spectra are well simulated based on the analysis of luminescence dynamical processes using the Judd–Ofelt theory and rate equations concerning the D53 and D54 levels. The energy charge and release pattern of the phosphor are presented and a 10% decay time is 29 s. The measurement of the thermoluminescence glow curve gives convincing evidence for the traps analysis.
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