FRANCISCO, LEONARDO H.C.MOREIRA, RENAN P.BRITO, HERMI F.MALTA, OSCAR L.FELINTO, MARIA C.F. da C.2025-01-312025-01-31FRANCISCO, LEONARDO H.C.; MOREIRA, RENAN P.; BRITO, HERMI F.; MALTA, OSCAR L.; FELINTO, MARIA C.F. da C. Investigation of site-selective luminescence on core-shell persistent phosphors using synchrotron radiation. In: BRAZIL MRS MEETING, 22nd, September 29 - October 3, 2024, Santos, SP. <b>Abstract...</b> São Carlos, SP: Aptor Software, 2024. p. 62-62. Disponível em: https://repositorio.ipen.br/handle/123456789/48948.https://repositorio.ipen.br/handle/123456789/48948With the growing interest in the development of multifunctional luminescent nanomaterials for applications in energy conversion and storage, several new methods have been studied for the fabrication of efficient core-shell persistent phosphors with long-lasting persistent luminescence in the visible and near-infrared range. Such materials often exhibit particular optical properties that may be precisely tuned via the modification of structural parameters and surface functionalization. [1-3] Hence, in this work, site-selective luminescence of core-shell green-emitting rare-earth-doped strontium aluminate persistent phosphors functionalized with europium β-diketonate (tta, dbm) complexes were investigated utilizing a combination of synchrotron-based techniques at the CARNAÚBA beamline of Sirius, such as X-ray absorption near edge structure (XANES), X-ray Excited Optical Luminescence (XEOL), and X-ray fluorescence (XRF). X-ray excited luminescence spectroscopy revealed that single-shell materials exhibit distinct emission profiles associated with energy-transfer mechanisms via the “antenna effect” for the different β-diketonate ligands, while double-shell materials showed that the ratio between Eu2+ (green) and Eu3+ (red) emission is intrinsically different for the edge and the bulk of the studied particles. Promising results also revealed the influence of shell thickness and distance in potential energy-transfer processes, outlining an important framework for the development of multifunctional persistent phosphors utilizing rare-earth complexes as luminescent sensitizers.62-62openAccessResumo de eventos científicoshttps://orcid.org/0000-0001-7028-0878