Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors

G. H. Mhlongo; M. S. Dhlamini; H. C. Swart; O. M. Ntwaeaborwa; K. T. Hillie

doi:10.1016/j.optmat.2011.03.009

Dependence of photoluminescence (PL) emission intensity on Eu³⁺ and ZnO concentrations in Y₂O₃:Eu³⁺ and ZnO·Y₂O₃:Eu³⁺ nanophosphors

G. H. Mhlongo, M. S. Dhlamini, H. C. Swart, O. M. Ntwaeaborwa, K. T. Hillie

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

24 Citations (Scopus)

Abstract

Y₂O₃:Eu³⁺ and ZnO·Y ₂O₃:Eu³⁺ nanophosphor powders with different concentrations of Eu³⁺ ions were synthesized by a sol-gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu³⁺ ions with the main emission peak at 612 nm was observed to increase with Eu³⁺ concentration from 0.25 to 0.75 mol% and decreased notably when the concentration was increased to 1 mol%. The decrease in the PL intensity at higher Eu³⁺ concentrations can be associated with concentration quenching effects. The red emission at 612 nm was shown to increase considerable when ZnO nanoparticles were incorporated in Y ₂O₃:Eu³⁺ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu ³⁺.

Original language	English
Pages (from-to)	1495-1499
Number of pages	5
Journal	Optical Materials
Volume	33
Issue number	10
DOIs	https://doi.org/10.1016/j.optmat.2011.03.009
Publication status	Published - Aug 2011
Externally published	Yes

Keywords

Concentration quenching effect
Energy transfer
Phosphors

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Computer Science
Atomic and Molecular Physics, and Optics
Spectroscopy
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Electrical and Electronic Engineering

Access to Document

10.1016/j.optmat.2011.03.009

Cite this

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title = "Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors",

abstract = "Y2O3:Eu3+ and ZnO·Y 2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol-gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main emission peak at 612 nm was observed to increase with Eu3+ concentration from 0.25 to 0.75 mol% and decreased notably when the concentration was increased to 1 mol%. The decrease in the PL intensity at higher Eu3+ concentrations can be associated with concentration quenching effects. The red emission at 612 nm was shown to increase considerable when ZnO nanoparticles were incorporated in Y 2O3:Eu3+ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu 3+.",

keywords = "Concentration quenching effect, Energy transfer, Phosphors",

author = "Mhlongo, {G. H.} and Dhlamini, {M. S.} and Swart, {H. C.} and Ntwaeaborwa, {O. M.} and Hillie, {K. T.}",

year = "2011",

month = aug,

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language = "English",

volume = "33",

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journal = "Optical Materials",

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T1 - Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors

AU - Mhlongo, G. H.

AU - Dhlamini, M. S.

AU - Swart, H. C.

AU - Ntwaeaborwa, O. M.

AU - Hillie, K. T.

PY - 2011/8

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N2 - Y2O3:Eu3+ and ZnO·Y 2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol-gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main emission peak at 612 nm was observed to increase with Eu3+ concentration from 0.25 to 0.75 mol% and decreased notably when the concentration was increased to 1 mol%. The decrease in the PL intensity at higher Eu3+ concentrations can be associated with concentration quenching effects. The red emission at 612 nm was shown to increase considerable when ZnO nanoparticles were incorporated in Y 2O3:Eu3+ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu 3+.

AB - Y2O3:Eu3+ and ZnO·Y 2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol-gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main emission peak at 612 nm was observed to increase with Eu3+ concentration from 0.25 to 0.75 mol% and decreased notably when the concentration was increased to 1 mol%. The decrease in the PL intensity at higher Eu3+ concentrations can be associated with concentration quenching effects. The red emission at 612 nm was shown to increase considerable when ZnO nanoparticles were incorporated in Y 2O3:Eu3+ while green emission from ZnO was suppressed. The increase is attributed to energy transfer from ZnO to Eu 3+.

KW - Concentration quenching effect

KW - Energy transfer

KW - Phosphors

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