Near-infrared emitting Cr(3+)-doped mixed oxide luminescent materials for optical imaging
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2021
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BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS
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The rapid growth of optical imaging in the latest years proposes novel alternatives to well-established
imaging techniques, in a way that current research interest within this field is
now focused on the design of efficient photonic materials and optical sensors[1-2]. In this
scenario, this work presents the development of Cr3+-doped Zn/Mg/Sn mixed oxides
prepared via solid-state and microwave synthesis, exhibiting interesting spectroscopic
properties in the red to near-infrared (NIR) range. Prepared compounds were analyzed by
PXRD, where the obtained diffraction profiles followed mainly the overlapping Mg2SnO4 and
Zn2SnO4 patterns, and crystallite size was estimated to be about 70 nm. SEM/EDS analysis
revealed micrometer-sized particles up to 20 μm, but much smaller particles and
homogeneous Cr3+ distribution were also observed. Moreover, Synchrotron radiation
measurements obtained at the Brazilian Synchrotron Light Laboratory, on the TGM
beamline via Vacuum UV Spectroscopy within the 4.5–7.5 eV energy range revealed distinct
emission profiles with increasing Zn concentration, affecting the contribution of deep-red
and NIR vibronic sidebands at 700 and 720 nm, respectively. Still, maximum absorption
energies (about 6.6 eV) remained constant for all the analyzed compounds, whereas the
broad-band NIR emission of Cr3+ ion centered around 770 nm assigned to the [4T2(t2e)→4A2]
transition is predominant. Persistent luminescence decay curves under near-band gap
excitation were also probed. Thus, in this work, we demonstrated an effective way to
assemble NIR emitting luminescent materials with potential applications in optical imaging
and photonics, where similar and expensive Cr3+-doped gallates are already widely explored.
Como referenciar
FRANCISCO, LEONARDO H.C.; MOREIRA, RENAN P.; SALVADOR, FRANCINE F. da S.; MOTTA, MARCIO P.; FELINTO, MARIA C.F. da C.; BRITO, HERMI F. Near-infrared emitting Cr(3+)-doped mixed oxide luminescent materials for optical imaging. In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS, August 30 - September 3, 2021, Online. Abstract... São Carlos, SP: Aptor Software, 2021. p. 194-194. Disponível em: http://repositorio.ipen.br/handle/123456789/32830. Acesso em: 24 Apr 2024.
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.