Sensitizing effects of ZnO quantum dots on red-emitting Pr 3+-doped SiO 2 phosphor

P. S. Mbule; G. H. Mhlongo; Shreyas S. Pitale; H. C. Swart; O. M. Ntwaeaborwa

doi:10.1016/j.physb.2011.09.097

Sensitizing effects of ZnO quantum dots on red-emitting Pr ³⁺-doped SiO ₂ phosphor

P. S. Mbule, G. H. Mhlongo, Shreyas S. Pitale, H. C. Swart, O. M. Ntwaeaborwa

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

12 Citations (Scopus)

Abstract

In this study, red cathodoluminescence (CL) (λ _emission= 614 nm) was observed from Pr ³⁺ ions in a glassy (amorphous) SiO ₂ host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO ₂:Pr ³⁺ suggesting that the ZnO QDs transferred excitation energy to Pr ³⁺ ions. That is, ZnO QDs acted to sensitize the Pr ³⁺ emission. The solgel method was used to prepare ZnOSiO ₂:Pr ³⁺ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr ³⁺ are discussed. In addition, the electronic states and the chemical composition of the ZnOSiO ₂:Pr ³⁺ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).

Original language	English
Pages (from-to)	1607-1610
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	407
Issue number	10
DOIs	https://doi.org/10.1016/j.physb.2011.09.097
Publication status	Published - 15 May 2012
Externally published	Yes

Keywords

Absorption
Cathodoluminescence
Phosphor
Quantum dots

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2011.09.097

Cite this

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title = "Sensitizing effects of ZnO quantum dots on red-emitting Pr 3+-doped SiO 2 phosphor",

abstract = "In this study, red cathodoluminescence (CL) (λ emission= 614 nm) was observed from Pr 3+ ions in a glassy (amorphous) SiO 2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO 2:Pr 3+ suggesting that the ZnO QDs transferred excitation energy to Pr 3+ ions. That is, ZnO QDs acted to sensitize the Pr 3+ emission. The solgel method was used to prepare ZnOSiO 2:Pr 3+ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr 3+ are discussed. In addition, the electronic states and the chemical composition of the ZnOSiO 2:Pr 3+ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).",

keywords = "Absorption, Cathodoluminescence, Phosphor, Quantum dots",

author = "Mbule, {P. S.} and Mhlongo, {G. H.} and Pitale, {Shreyas S.} and Swart, {H. C.} and Ntwaeaborwa, {O. M.}",

year = "2012",

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T1 - Sensitizing effects of ZnO quantum dots on red-emitting Pr 3+-doped SiO 2 phosphor

AU - Mbule, P. S.

AU - Mhlongo, G. H.

AU - Pitale, Shreyas S.

AU - Swart, H. C.

AU - Ntwaeaborwa, O. M.

PY - 2012/5/15

Y1 - 2012/5/15

N2 - In this study, red cathodoluminescence (CL) (λ emission= 614 nm) was observed from Pr 3+ ions in a glassy (amorphous) SiO 2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO 2:Pr 3+ suggesting that the ZnO QDs transferred excitation energy to Pr 3+ ions. That is, ZnO QDs acted to sensitize the Pr 3+ emission. The solgel method was used to prepare ZnOSiO 2:Pr 3+ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr 3+ are discussed. In addition, the electronic states and the chemical composition of the ZnOSiO 2:Pr 3+ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).

AB - In this study, red cathodoluminescence (CL) (λ emission= 614 nm) was observed from Pr 3+ ions in a glassy (amorphous) SiO 2 host. This emission was enhanced considerably when ZnO quantum dots (QDs) were incorporated in the SiO 2:Pr 3+ suggesting that the ZnO QDs transferred excitation energy to Pr 3+ ions. That is, ZnO QDs acted to sensitize the Pr 3+ emission. The solgel method was used to prepare ZnOSiO 2:Pr 3+ phosphors with different molar ratios of Zn to Si. The effects of the ZnO QDs concentration and the possible mechanisms of energy transfer from ZnO to Pr 3+ are discussed. In addition, the electronic states and the chemical composition of the ZnOSiO 2:Pr 3+ phosphors were analyzed using X-ray photoelectron spectroscopy (XPS).

KW - Absorption

KW - Cathodoluminescence

KW - Phosphor

KW - Quantum dots

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