Xufeng Zhou and Yuhua Wang
Lanzhou University, China
Posters & Accepted Abstracts: Res. Rev. J Mat. Sci
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 block particles of these samples and consists 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-doping 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 after glow 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. Recent Publications 1. Xufeng Zhou et al. (2018) Structure, bandgap, photoluminescence evolution and thermal stability improved of Sr replacement apatite phosphors Ca10-xSrx(PO4)6F2: Eu2+(x=4, 6, 8). Dyes and Pigments, 152: 75-84. 2. Xufeng Zhou et al. (2018) K4CaGe3O9:Mn2+, Yb3+: A novel orange-emitting long persistent luminescence phosphor with special nano structure. Journal of Materials Chemistry C 6:7353-7360.
Xufeng Zhou is a PhD student at Lanzhou University. His main research direction is solid luminescence material.
E-mail: [email protected]