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Issue 1, 2016
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Ca6BaP4O17:Eu2+,Gd3+: a yellow emitting long-lasting phosphor with high brightness and long afterglow duration

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Abstract

A yellow emitting long-lasting phosphor based on a Ca6BaP4O17 matrix was successfully synthesized by means of solid state method in a reducing atmosphere. The persistent phosphor was characterized in detail by X-ray powder diffraction (XRD), photoluminescence (PL), persistent luminescence and decay curves as well as thermoluminescence (TL) spectra. When irradiated by ultraviolet light in advance, Ca6BaP4O17:0.02Eu2+,0.015Gd3+ phosphor shows a yellow persistent luminescence dominating at ∼553 nm at room temperature due to the 5d–4f transitions of Eu2+ ions and the chromaticity coordinate was calculated to be (0.431, 0.545), which is in the yellow region. Moreover, investigation of TL curves reveals that the incorporation of Gd3+ ion creates more appropriate energy traps and increases the density of intrinsic traps leading to the enhancement of afterglow. Consequently, the initial long lasting phosphorescence (LLP) intensity of Ca6BaP4O17:0.02Eu2+,0.015Gd3+ (0.21 cd m−2) is significantly enhanced by a factor of 2 compared with Ca6BaP4O17:0.02Eu2+,0.015Ho3+ and the sustained phosphorescence also can last approximately 19 h above the recognizable intensity level (0.32 mcd m−2). In order to study the trapping process and explain the mechanism of long afterglow, a schematic model is also proposed and discussed in detail.

Graphical abstract: Ca6BaP4O17:Eu2+,Gd3+: a yellow emitting long-lasting phosphor with high brightness and long afterglow duration

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Article information


Submitted
23 Sep 2015
Accepted
09 Nov 2015
First published
13 Nov 2015

New J. Chem., 2016,40, 613-618
Article type
Paper
Author version available

Ca6BaP4O17:Eu2+,Gd3+: a yellow emitting long-lasting phosphor with high brightness and long afterglow duration

H. Guo, Y. Wang, W. Chen, W. Zeng, G. Li and Y. Li, New J. Chem., 2016, 40, 613
DOI: 10.1039/C5NJ02575C

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