Resolution of Eu2+ asymmetrical emission peak of SrAl2O4:Eu2+, Dy3+ phosphor by cathodoluminescence measurements

J. M. Ngaruiya; S. Nieuwoudt; O. M. Ntwaeaborwa; J. J. Terblans; H. C. Swart

doi:10.1016/j.matlet.2008.02.016

Resolution of Eu²⁺ asymmetrical emission peak of SrAl₂O₄:Eu²⁺, Dy³⁺ phosphor by cathodoluminescence measurements

J. M. Ngaruiya, S. Nieuwoudt, O. M. Ntwaeaborwa, J. J. Terblans, H. C. Swart

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

48 Citations (Scopus)

Abstract

The green photoluminescence (PL) peak from SrAl₂O₄:Eu²⁺, Dy³⁺ phosphor is normally asymmetrical and tails towards the longer wavelengths. Previous Gaussian de-convolution resulted in two peaks attributed to Eu²⁺ occupying the two different crystallographic Sr²⁺ sites. In this letter two resolved peaks through cathodoluminescence (CL) measurements are reported. The intensity degradation upon the phosphor charging when exposed to electron beam reveals additional information about the electronic transitions. The observed peak in the longer wavelength is associated with preferential alignment of one of the Eu²⁺ d-orbital. The observations are used to modify Clabau et al.'s model of afterglow mechanism.

Original language	English
Pages (from-to)	3192-3194
Number of pages	3
Journal	Materials Letters
Volume	62
Issue number	17-18
DOIs	https://doi.org/10.1016/j.matlet.2008.02.016
Publication status	Published - 30 Jun 2008
Externally published	Yes

Keywords

Characterization methods
Luminescence
Phosphors

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.matlet.2008.02.016

Cite this

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title = "Resolution of Eu2+ asymmetrical emission peak of SrAl2O4:Eu2+, Dy3+ phosphor by cathodoluminescence measurements",

abstract = "The green photoluminescence (PL) peak from SrAl2O4:Eu2+, Dy3+ phosphor is normally asymmetrical and tails towards the longer wavelengths. Previous Gaussian de-convolution resulted in two peaks attributed to Eu2+ occupying the two different crystallographic Sr2+ sites. In this letter two resolved peaks through cathodoluminescence (CL) measurements are reported. The intensity degradation upon the phosphor charging when exposed to electron beam reveals additional information about the electronic transitions. The observed peak in the longer wavelength is associated with preferential alignment of one of the Eu2+ d-orbital. The observations are used to modify Clabau et al.'s model of afterglow mechanism.",

keywords = "Characterization methods, Luminescence, Phosphors",

author = "Ngaruiya, {J. M.} and S. Nieuwoudt and Ntwaeaborwa, {O. M.} and Terblans, {J. J.} and Swart, {H. C.}",

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language = "English",

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T1 - Resolution of Eu2+ asymmetrical emission peak of SrAl2O4:Eu2+, Dy3+ phosphor by cathodoluminescence measurements

AU - Ngaruiya, J. M.

AU - Nieuwoudt, S.

AU - Ntwaeaborwa, O. M.

AU - Terblans, J. J.

AU - Swart, H. C.

PY - 2008/6/30

Y1 - 2008/6/30

N2 - The green photoluminescence (PL) peak from SrAl2O4:Eu2+, Dy3+ phosphor is normally asymmetrical and tails towards the longer wavelengths. Previous Gaussian de-convolution resulted in two peaks attributed to Eu2+ occupying the two different crystallographic Sr2+ sites. In this letter two resolved peaks through cathodoluminescence (CL) measurements are reported. The intensity degradation upon the phosphor charging when exposed to electron beam reveals additional information about the electronic transitions. The observed peak in the longer wavelength is associated with preferential alignment of one of the Eu2+ d-orbital. The observations are used to modify Clabau et al.'s model of afterglow mechanism.

AB - The green photoluminescence (PL) peak from SrAl2O4:Eu2+, Dy3+ phosphor is normally asymmetrical and tails towards the longer wavelengths. Previous Gaussian de-convolution resulted in two peaks attributed to Eu2+ occupying the two different crystallographic Sr2+ sites. In this letter two resolved peaks through cathodoluminescence (CL) measurements are reported. The intensity degradation upon the phosphor charging when exposed to electron beam reveals additional information about the electronic transitions. The observed peak in the longer wavelength is associated with preferential alignment of one of the Eu2+ d-orbital. The observations are used to modify Clabau et al.'s model of afterglow mechanism.

KW - Characterization methods

KW - Luminescence

KW - Phosphors

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