Abstract
Zinc gallate (ZnGa2O4) spinel ceramics doped with Mn2+ ions was prepared by a solid-state reaction at 1200 °C in air. Manganese concentration was equal to 0.05 mol.% of MnO with respect to ZnO. Ceramics produced in this way show an efficient green emission at about 505 nm under UV or X-ray excitations, which is caused by Mn2+ ions. This green emission is observed also as a relatively long afterglow (visible to the naked eye in the dark for about one hour) after switching-off the X-ray excitation. Time profiles of the beginning of glow and afterglow have been studied together with thermally stimulated (TSL) and optically stimulated (OSL) luminescence. Experimental results demonstrate a presence of few types of shallow and deep traps responsible for the observed afterglow and TSL/OSL emission of the material. The possibility of pulsed optical stimulation and time-resolved OSL characteristics of ZnGa2O4: Mn2+ has been reported for the first time. The presented results suggest the ZnGa2O4: Mn2+ spinel as a promising material for further fundamental research and possibility of application as a green long-lasting phosphor or storage phosphor for TSL/OSL radiation dosimetry.
Highlights
Zinc gallate (ZnGa2O4) spinel ceramics doped with Mn2+ ions was prepared by a solid-state reaction at 1200 °C in air
Mn2+ (3d5) ions, in particular in ZnGa2O4 spinel, produces a bright green color emission under the excitation by UV light or electron beam that can be applicable for vacuum fluorescent displays (VFDs), field emission displays (FEDs) and thin-film electroluminescent devices[22,23,24,25]
The excitation of Mn2+–doped ZnGa2O4 ceramics monitored at 502 nm exhibits relatively strong excitation band in deep UV spectral range with a maximum at about 245 nm at room temperature which is related to the fundamental absorption of zinc gallate host
Summary
The excitation of Mn2+–doped ZnGa2O4 ceramics monitored at 502 nm exhibits relatively strong excitation band in deep UV spectral range with a maximum at about 245 nm at room temperature which is related to the fundamental absorption of zinc gallate host This indicates the recombination mechanism of Mn2+ ions excitation in the spinel host[18,42]. Its intensity is more than an order of magnitude lower than the excitation at 240–245 nm The satellite emission lines at 510 and 517 nm observed in the studied ZnGa2O4: Mn2+ ceramics at the low temperature we attribute to Mn2+ ions in sites with lower symmetry, for example, ones distorted by oxygen vacancies.
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