Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation

G. H. Mhlongo; O. M. Ntwaeaborwa; H. C. Swart; R. E. Kroon; P. Solarz; W. Ryba-Romanowski; K. T. Hillie

doi:10.1021/jp201142d

Luminescence dependence of Pr³⁺ activated SiO₂ nanophosphor on Pr³⁺ concentration, temperature, and ZnO incorporation

G. H. Mhlongo, O. M. Ntwaeaborwa, H. C. Swart, R. E. Kroon, P. Solarz, W. Ryba-Romanowski, K. T. Hillie

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Green-emitting ZnO nanoparticles were successfully embedded in Pr ³⁺-doped SiO₂ by a sol-gel method resulting in a red-emitting ZnO•SiO₂:Pr³⁺ nanocomposite phosphor. The particle morphology and luminescent properties of SiO₂:Pr ³⁺ phosphor powders, with or without ZnO nanoparticles, were, respectively, investigated by electron microscopy and luminescence spectroscopy. Luminescence of SiO₂:Pr³⁺ was studied as a function of different Pr³⁺ concentrations and temperature. Both Pr³⁺ concentration and temperature were found to influence the ¹D ₂ emission from Pr³⁺ strongly. Defects emission from ZnO nanoparticles was measured at 517 nm compared with the normal peak at 470 nm from micrometer-sized ZnO powders. Only red emission at 614 nm from Pr ³⁺ ions in SiO₂:Pr³⁺ and ZnO•SiO ₂:Pr³⁺ was observed. The green emission from ZnO in ZnO•SiO₂:Pr³⁺ was quenched, and the red emission from Pr³⁺ was doubly enhanced compared with SiO₂:Pr ³⁺. The enhancement of the PL intensity from SiO₂:Pr ³⁺ with ZnO incorporation denotes the presence of energy transfer from ZnO to Pr³⁺ ions.

Original language	English
Pages (from-to)	17625-17632
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	36
DOIs	https://doi.org/10.1021/jp201142d
Publication status	Published - 15 Sept 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation",

abstract = "Green-emitting ZnO nanoparticles were successfully embedded in Pr 3+-doped SiO2 by a sol-gel method resulting in a red-emitting ZnO•SiO2:Pr3+ nanocomposite phosphor. The particle morphology and luminescent properties of SiO2:Pr 3+ phosphor powders, with or without ZnO nanoparticles, were, respectively, investigated by electron microscopy and luminescence spectroscopy. Luminescence of SiO2:Pr3+ was studied as a function of different Pr3+ concentrations and temperature. Both Pr3+ concentration and temperature were found to influence the 1D 2 emission from Pr3+ strongly. Defects emission from ZnO nanoparticles was measured at 517 nm compared with the normal peak at 470 nm from micrometer-sized ZnO powders. Only red emission at 614 nm from Pr 3+ ions in SiO2:Pr3+ and ZnO•SiO 2:Pr3+ was observed. The green emission from ZnO in ZnO•SiO2:Pr3+ was quenched, and the red emission from Pr3+ was doubly enhanced compared with SiO2:Pr 3+. The enhancement of the PL intensity from SiO2:Pr 3+ with ZnO incorporation denotes the presence of energy transfer from ZnO to Pr3+ ions.",

author = "Mhlongo, {G. H.} and Ntwaeaborwa, {O. M.} and Swart, {H. C.} and Kroon, {R. E.} and P. Solarz and W. Ryba-Romanowski and Hillie, {K. T.}",

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T1 - Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation

AU - Mhlongo, G. H.

AU - Ntwaeaborwa, O. M.

AU - Swart, H. C.

AU - Kroon, R. E.

AU - Solarz, P.

AU - Ryba-Romanowski, W.

AU - Hillie, K. T.

PY - 2011/9/15

Y1 - 2011/9/15

N2 - Green-emitting ZnO nanoparticles were successfully embedded in Pr 3+-doped SiO2 by a sol-gel method resulting in a red-emitting ZnO•SiO2:Pr3+ nanocomposite phosphor. The particle morphology and luminescent properties of SiO2:Pr 3+ phosphor powders, with or without ZnO nanoparticles, were, respectively, investigated by electron microscopy and luminescence spectroscopy. Luminescence of SiO2:Pr3+ was studied as a function of different Pr3+ concentrations and temperature. Both Pr3+ concentration and temperature were found to influence the 1D 2 emission from Pr3+ strongly. Defects emission from ZnO nanoparticles was measured at 517 nm compared with the normal peak at 470 nm from micrometer-sized ZnO powders. Only red emission at 614 nm from Pr 3+ ions in SiO2:Pr3+ and ZnO•SiO 2:Pr3+ was observed. The green emission from ZnO in ZnO•SiO2:Pr3+ was quenched, and the red emission from Pr3+ was doubly enhanced compared with SiO2:Pr 3+. The enhancement of the PL intensity from SiO2:Pr 3+ with ZnO incorporation denotes the presence of energy transfer from ZnO to Pr3+ ions.

AB - Green-emitting ZnO nanoparticles were successfully embedded in Pr 3+-doped SiO2 by a sol-gel method resulting in a red-emitting ZnO•SiO2:Pr3+ nanocomposite phosphor. The particle morphology and luminescent properties of SiO2:Pr 3+ phosphor powders, with or without ZnO nanoparticles, were, respectively, investigated by electron microscopy and luminescence spectroscopy. Luminescence of SiO2:Pr3+ was studied as a function of different Pr3+ concentrations and temperature. Both Pr3+ concentration and temperature were found to influence the 1D 2 emission from Pr3+ strongly. Defects emission from ZnO nanoparticles was measured at 517 nm compared with the normal peak at 470 nm from micrometer-sized ZnO powders. Only red emission at 614 nm from Pr 3+ ions in SiO2:Pr3+ and ZnO•SiO 2:Pr3+ was observed. The green emission from ZnO in ZnO•SiO2:Pr3+ was quenched, and the red emission from Pr3+ was doubly enhanced compared with SiO2:Pr 3+. The enhancement of the PL intensity from SiO2:Pr 3+ with ZnO incorporation denotes the presence of energy transfer from ZnO to Pr3+ ions.

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Luminescence dependence of Pr³⁺ activated SiO₂ nanophosphor on Pr³⁺ concentration, temperature, and ZnO incorporation

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