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

被引：47

作者：

Ngaruiya, J. M. ^{[1
,2
]}

Nieuwoudt, S. ^{[1
]}

Ntwaeaborwa, O. M. ^{[1
]}

Terblans, J. J. ^{[1
]}

Swart, H. C. ^{[1
]}

机构：

[1] Univ Orange Free State, Dept Phys, ZA-9300 Bloemfontein, South Africa

[2] Jomo Kenyatta Univ Agr & Technol, Dept Phys, Nairobi 00200, Kenya

来源：

MATERIALS LETTERS | 2008年 / 62卷 / 17-18期

关键词：

luminescence; phosphors; characterization methods;

D O I：

10.1016/j.matlet.2008.02.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：3192 / 3194

页数：3

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