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.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
K
4
CaGe
3
O
9
:Mn
2+
, Yb
3+
: A novel orange-emitting long persistent luminescence phosphor with special
nano structure
Xufeng Zhou
and
Yuhua Wang
Lanzhou University, China
A
novel germanate based orange emitting long persistent luminescence (PersL) phosphor: K
4
CaGe
3
O
9
(KCGO):Mn
2+
,Yb
3+
has
been successfully synthesized by the solid-state reaction. The special nano structures of KCGO:Mn
2+
and KCGO:Mn
2+
,Yb
3+
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:Mn
2+
. Furthermore, after co-doping
with Yb
3+
, the PersL properties have been effectively improved due to the new traps with high concentration caused by the
nonequivalent substitution of Yb
3+
. With the optimum doping concentration and sufficient excitation with UV light, the after
glow of KCGO:0.02Mn
2+
,0.015Yb
3+
can persist over 5 h above the recognizable intensity level (0.32 mcd/m
2
). Both fluorescence
and phosphorescence spectra of KCGO:Mn
2+
,Yb
3+
exhibit only one broad emission band, which belongs to the
4
T
1
(G)-
6
A
1
(S)
transitions of Mn
2+
. 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 Ca
10-x
Sr
x
(PO
4
)6F
2
: Eu
2+
(x=4, 6, 8). Dyes and Pigments, 152: 75-84.
2. Xufeng Zhou et al. (2018) K
4
CaGe
3
O
9
:Mn
2+
, Yb
3+
: A novel orange-emitting long persistent luminescence phosphor with
special nano structure. Journal of Materials Chemistry C 6:7353-7360.
Biography
Xufeng Zhou is a PhD student at Lanzhou University. His main research direction is solid luminescence material.
810773647@qq.comXufeng Zhou et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021