Investigation of site-selective luminescence on core-shell persistent phosphors using synchrotron radiation
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2024
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BRAZIL MRS MEETING, 22nd
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With 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.
Como referenciar
FRANCISCO, 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. Abstract... São Carlos, SP: Aptor Software, 2024. p. 62-62. Disponível em: https://repositorio.ipen.br/handle/123456789/48948. Acesso em: 20 Mar 2026.
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