Trends in Cr3+ red emissions from ZnGa2O4 nanostructures produced by pulsed laser ablation in a liquid medium

authors	Relvas, MS; Soares, MRN; Pereira, SO; Girao, AV; Costa, PM; Monteiro, T
nationality	International
journal	JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
author keywords	Chromium-doped zinc gallate nanostructures; Persistent luminescence; Pulsed laser ablation in liquid medium
keywords	PERSISTENT LUMINESCENT NANOPARTICLES; PROMISING FLUORESCENT-PROBE; IN-VIVO; SPINEL OXIDES; N-LINES; SPECTRA; IONS; AFTERGLOW; DISORDER; PHOSPHOR
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 beta-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.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0022-3697
isbn	1879-2553
year published	2019
volume	129
beginning page	413
ending page	423
digital object identifier (doi)	10.1016/j.jpcs.2019.01.022
web of science category	Chemistry, Multidisciplinary; Physics, Condensed Matter
subject category	Chemistry; Physics
unique article identifier	WOS:000466250300050