Development of rare-earth-doped hybrid materials towards luminescence enhancement
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2020
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PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS
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Resumo
The rapid growth on the development of rare-earth-doped luminescent materials
has been drawing attention due to complex energy converting systems that can be
structurally engineered to tune absorption and emission wavelengths, outlining new
materials and applications for photonics. [1, 2] In this scenario, this work presents the
development of rare-earth-doped strontium aluminate phosphors prepared by the
Pechini method and modified with 3-aminopropyltrimethoxysilane via
microwaveassisted synthesis, integrating a silica network with rare-earth β-diketonate
complexes in order to enhance the absorption section and promote energy-transfer
processes within the system. The prepared materials were analyzed by X-ray powder
diffraction, where a characteristic monoclinic SrAl2O4: Eu2+, Dy3+ phase with crystallite
size around 30 nm was observed. Several structural changes attributed to surface
modification were also noted. Scanning Electron Microscopy images and Energy-
Dispersive X-ray Spectroscopy results revealed the expected surface alteration effects, as
well as the element mapping throughout the samples. Standard UV-Vis and Vacuum-UV
Luminescence Spectroscopies were also performed. The optical behavior of the
synthesized materials was characterized by green Eu2+ emission assigned to the
4f65d1→4f7(8S7/2) interconfigurational transition under near-ultraviolet excitation
alongside narrow 4f-4f transitions of non-reduced Eu3+. Furthermore, in functionalized
samples, S0→Sn transitions attributed to β-diketonate ligands were also observed,
unveiling an increasing absorption section under ultraviolet light. Finally, it was noted a
significant increase in the persistence decay time under near Band-Gap excitation in
modified materials, suggesting interactions between the inorganic host-matrix, the silica
network, and the β-diketonate complexes.
Como referenciar
FRANCISCO, LEONARDO; FELINTO, MARIA; BRITO, HERMI. Development of rare-earth-doped hybrid materials towards luminescence enhancement. In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS, October 13-15, 2020, Online. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/32676. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.