Issue 1, 2016

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

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

Article information

Article type
Paper
Submitted
23 Sep 2015
Accepted
09 Nov 2015
First published
13 Nov 2015

New J. Chem., 2016,40, 613-618

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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