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K4CaGe3O9:Mn2+,Yb3+: A Novel Orange-emitting Long Persistent Luminescence Phosphor With Special Nano Structure

Abstract

In this work, a novel germanate based orange-emitting long persistent luminescence (PersL) phosphor: K4CaGe3O9(KCGO):Mn2+,Yb3+ has been successfully synthesized by the solid-state reaction. The special nano structures of KCGO:Mn2+ and KCGO:Mn2+,Yb3+ were indicated by transmission electron microscope (TEM) images that the block particles fo these samples are consist of many irregular spherical nano-particles and the size of these spherical particles is less than 10 nm. This special nano structure exist many defects and could provide precondition for the PersL properties of KCGO:Mn2+. Furthermore, after co-doped with Yb3+, the PersL properties have been effectively improved due to the new traps with high concentration caused by the nonequivalent substitution of Yb3+. With the optimum doping concentration and sufficient excitation with UV light, the afterglow of KCGO:0.02Mn2+,0.015Yb3+ can persist over 5 h above the recognizable intensity level (≧0.32 mcd/m2). Both fluorescence and phosphorescence spectra of KCGO:Mn2+,Yb3+ exhibit only one broad emission band, which belongs to the 4T1(G)-6A1(S) transitions of Mn2+. In addition, with the help of thermoluminescence (TL) curves, the processes and possible mechanism are studied and discussed.

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Publication details

The article was received on 18 Apr 2018, accepted on 04 Jun 2018 and first published on 08 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01845F
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    K4CaGe3O9:Mn2+,Yb3+: A Novel Orange-emitting Long Persistent Luminescence Phosphor With Special Nano Structure

    X. Zhou, W. Geng, H. Guo, J. Ding and Y. Wang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01845F

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