Enhanced luminescence and degradation of SiO2:Ce,Tb powder phosphors prepared by a sol-gel process

O. M. Ntwaeaborwa; H. C. Swart; R. E. Kroon; P. H. Holloway; J. R. Botha

doi:10.1016/j.jpcs.2006.04.002

Enhanced luminescence and degradation of SiO₂:Ce,Tb powder phosphors prepared by a sol-gel process

O. M. Ntwaeaborwa, H. C. Swart, R. E. Kroon, P. H. Holloway, J. R. Botha

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

48 Citations (Scopus)

Abstract

Enhanced green photoluminescence and cathodoluminescence (CL) from Tb³⁺ ions due to co-doping with Ce³⁺ ions were observed from SiO₂:Ce,Tb powder phosphors prepared by a sol-gel technique. Blue emission from the Ce³⁺ ions was completely suppressed by Tb co-doping, presumably due to energy transfer from Ce³⁺ to Tb³⁺. In addition, the green CL intensity from SiO₂:Ce,Tb degraded by ∼50% when the powders were irradiated for 10 h with a 2 keV, 54 mA/cm² beam of electrons in an ultra-high vacuum chamber containing either 1×10^-8 or 1×10^-7 Torr O₂. Desorption of oxygen from the surface was observed during the decrease of CL intensity. The mechanisms for energy transfer from Ce³⁺ ions to Tb³⁺ ions to enhance the green luminescence, and mechanisms for desorption of oxygen from the phosphor surface that would result in decreased CL intensity are discussed.

Original language	English
Pages (from-to)	1749-1753
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	67
Issue number	8
DOIs	https://doi.org/10.1016/j.jpcs.2006.04.002
Publication status	Published - Aug 2006
Externally published	Yes

Keywords

Cathodoluminescence
Degradation
Energy transfer
Photoluminescence

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2006.04.002

Cite this

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title = "Enhanced luminescence and degradation of SiO2:Ce,Tb powder phosphors prepared by a sol-gel process",

abstract = "Enhanced green photoluminescence and cathodoluminescence (CL) from Tb3+ ions due to co-doping with Ce3+ ions were observed from SiO2:Ce,Tb powder phosphors prepared by a sol-gel technique. Blue emission from the Ce3+ ions was completely suppressed by Tb co-doping, presumably due to energy transfer from Ce3+ to Tb3+. In addition, the green CL intensity from SiO2:Ce,Tb degraded by ∼50% when the powders were irradiated for 10 h with a 2 keV, 54 mA/cm2 beam of electrons in an ultra-high vacuum chamber containing either 1×10-8 or 1×10-7 Torr O2. Desorption of oxygen from the surface was observed during the decrease of CL intensity. The mechanisms for energy transfer from Ce3+ ions to Tb3+ ions to enhance the green luminescence, and mechanisms for desorption of oxygen from the phosphor surface that would result in decreased CL intensity are discussed.",

keywords = "Cathodoluminescence, Degradation, Energy transfer, Photoluminescence",

author = "Ntwaeaborwa, {O. M.} and Swart, {H. C.} and Kroon, {R. E.} and Holloway, {P. H.} and Botha, {J. R.}",

year = "2006",

month = aug,

doi = "10.1016/j.jpcs.2006.04.002",

language = "English",

volume = "67",

pages = "1749--1753",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Ltd.",

number = "8",

}

TY - JOUR

T1 - Enhanced luminescence and degradation of SiO2:Ce,Tb powder phosphors prepared by a sol-gel process

AU - Ntwaeaborwa, O. M.

AU - Swart, H. C.

AU - Kroon, R. E.

AU - Holloway, P. H.

AU - Botha, J. R.

PY - 2006/8

Y1 - 2006/8

N2 - Enhanced green photoluminescence and cathodoluminescence (CL) from Tb3+ ions due to co-doping with Ce3+ ions were observed from SiO2:Ce,Tb powder phosphors prepared by a sol-gel technique. Blue emission from the Ce3+ ions was completely suppressed by Tb co-doping, presumably due to energy transfer from Ce3+ to Tb3+. In addition, the green CL intensity from SiO2:Ce,Tb degraded by ∼50% when the powders were irradiated for 10 h with a 2 keV, 54 mA/cm2 beam of electrons in an ultra-high vacuum chamber containing either 1×10-8 or 1×10-7 Torr O2. Desorption of oxygen from the surface was observed during the decrease of CL intensity. The mechanisms for energy transfer from Ce3+ ions to Tb3+ ions to enhance the green luminescence, and mechanisms for desorption of oxygen from the phosphor surface that would result in decreased CL intensity are discussed.

AB - Enhanced green photoluminescence and cathodoluminescence (CL) from Tb3+ ions due to co-doping with Ce3+ ions were observed from SiO2:Ce,Tb powder phosphors prepared by a sol-gel technique. Blue emission from the Ce3+ ions was completely suppressed by Tb co-doping, presumably due to energy transfer from Ce3+ to Tb3+. In addition, the green CL intensity from SiO2:Ce,Tb degraded by ∼50% when the powders were irradiated for 10 h with a 2 keV, 54 mA/cm2 beam of electrons in an ultra-high vacuum chamber containing either 1×10-8 or 1×10-7 Torr O2. Desorption of oxygen from the surface was observed during the decrease of CL intensity. The mechanisms for energy transfer from Ce3+ ions to Tb3+ ions to enhance the green luminescence, and mechanisms for desorption of oxygen from the phosphor surface that would result in decreased CL intensity are discussed.

KW - Cathodoluminescence

KW - Degradation

KW - Energy transfer

KW - Photoluminescence

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U2 - 10.1016/j.jpcs.2006.04.002

DO - 10.1016/j.jpcs.2006.04.002

M3 - Article

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JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

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