Trends in Cr3+ red emissions from ZnGa2O4 nanostructures produced by pulsed laser ablation in a liquid medium
Abstract
In the present study, the pulsed laser ablation in water technique was used to produce chromium-doped ZnGa2O4 nanostructures from a sintered pellet target. The materials obtained mainly comprised the cubic spinel crystalline structure of ZnGa2O4 and the monoclinic β-Ga2O3 as a minority phase (3%). Intra-ionic Cr3+ red luminescence from the ions in the spinel structure was the dominant recombination process in the bulk target and nanostructures. Overlapping of the Cr-related emitting centers was identified and the samples exhibited persistent red luminescence, which is of interest for bioimaging. Moreover, the temperature-dependent luminescence demonstrated the versatility of the nanostructures obtained, which can be further explored as temperature sensors based on the low energy shift of the zero phonon line peak positions as the temperature increased.
- Publication:
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Journal of Physics and Chemistry of Solids
- Pub Date:
- June 2019
- DOI:
- 10.1016/j.jpcs.2019.01.022
- Bibcode:
- 2019JPCS..129..413R
- Keywords:
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- Chromium-doped zinc gallate nanostructures;
- Persistent luminescence;
- Pulsed laser ablation in liquid medium