Spectroscopic properties and quantum cutting in Tb3+-Yb3+ co-doped ZrO2 nanocrystals
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2013
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Journal of Applied Physics
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Ultraviolet-visible to near-infrared quantum cutting (QC) materials are a promising tool to enhance
the efficiency of conventional crystalline silicon solar cells. The spectroscopic properties of Tb3þ–Yb3þ
co-doped ZrO2 nanocrystals are presented, and the QC mechanisms in these nanocrystals are
investigated. The materials were fabricated using the sol gel method and characterized using X-ray
powder diffraction, X-ray absorption near edge structure, and luminescence spectroscopy. The
incorporation of Yb3þ ions into the host induced a crystalline phase change of ZrO2 from monoclinic to
tetragonal to cubic symmetry and influenced the Tb valence state. The Tb3þ visible emission,
excitation intensity (monitored by the Tb3þ:
5
D4 emission), decay time of the Tb3þ:
5
D4 emitter level,
and down-conversion (DC) emission intensity increased with Yb3þ concentration. Furthermore, a
sublinear dependence of the DC intensity on the excitation power at the Tb3þ:
5
D4 level indicated
the coexistence of two different QC mechanisms from Tb3þ ! Yb3þ. The first one is a linear process
in which one Tb3þ ion transfers its energy simultaneously to two Yb3þ ions, known as cooperative
energy transfer, and the second one is a non-linear process involving an intermediated virtual level
in the Tb3þ ion.
Como referenciar
TERRA, I.A.A.; BORRERO GONZALEZ, L.J.; CARVALHO, J.M.; TERRILE, M.C.; FELINTO, M.C.F.C.; BRITO, H.F.; NUNES, L.A.O. Spectroscopic properties and quantum cutting in Tb3+-Yb3+ co-doped ZrO2 nanocrystals. Journal of Applied Physics, v. 113, p. 073105-1 - 073105-6, 2013. DOI: 10.1063/1.4792743. Disponível em: http://repositorio.ipen.br/handle/123456789/4047. Acesso em: 11 May 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.