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.com
Volume 5, Issue 5
Res. Rev. J Mat. Sci. 2017
ISSN: 2321-6212
Advanced Materials 2017
September 07-08, 2017
September 07-08, 2017 | Edinburgh, Scotland
Advanced materials & Processing
11
th
International Conference on
Encapsulation of oxynitride phosphors into sintered Li
2
O-ZnO-B
2
O
3
-P
2
O
5
-CaF
2
glass body
N. Akiyama
1
, H. Kuwahara
1
, H. Kuroe
1
, H. T. Hintzen
2
and
K. Itatani
1
1
Sophia University, Japan
2
Delft University of Technology, The Netherlands
T
he conditions for the fabrication of transparent glass body in the Li
2
O-ZnO-B
2
O
3
-P
2
O
5
-CaF
2
system were examined by a
pressureless firing and subsequent oxygen-supplied hot isostatic pressing (O
2
-HIP). The starting glass was prepared by melting
the mixture of LiOH, ZnO, H
3
BO
4
, H
3
PO
4
and CaF
2
at 1100ºC in air, followed by quenching on copper plates cooled by liquid nitrogen.
The glass powder compact was pressurelessly-fired at 370ºC for 1 h in order to remove the open pores, and the subsequent O
2
-HIP
treatment at 370 ºC for 24 h under the pressure of 130 MPa made the clear light transmission possible, regardless of the formation
of Ca
2
P
2
O
7
on the surface. The glass body obtained by firing at 370˚C for 1 h and the subsequent O
2
-HIP treatment at 370 ºC for
24 h was hydrothermally-treated in water at 100˚C for 1 h, and found that the mass loss of this body was as low as 0.25%, showing
excellent water resistance. When the oxynitride phosphors, i.e., blue-emitting (La
0.96
Ce
0.04
)
3
Si
8
O
4
N
11
and yellow-emitting (Ca
0.97
Eu
0.03
)
Si
2
O
2
N
2
, were encapsulated into the glass, no peak shifts in the emission/excitation spectra were found, which demonstrated that no
significant degradation of phosphors has occurred during the encapsulation operation. Pseudo-white light emission was observed by
the equi-mass addition (total amount: 3 mass%) of (La
0.96
Ce
0.04
)
3
Si
8
O
4
N
11
and (Ca
0.97
Eu
0.03
)Si
2
O
2
N
2
. Overall, the transparent glass body
could be fabricated by the pressureless firing and subsequent O
2
-HIP treatment, and the phosphors were encapsulated into the glass
without significant degradation.
Biography
Nanako Akiyama is a student of Sophia graduate school. Her research interest is the luminescence properties of oxide, oxynitride and nitride phosphors, and the
encapsulation technique of the phosphors in the glass.
nanako.jennifer@gmail.comN. Akiyama et al., Res. Rev. J Mat. Sci. 2017, 5:5
DOI: 10.4172/2321-6212-C1-006
Figure1
:
Chromaticity coordinate of glass body with
(La0.96Ce0.04)3Si8O4N11 and (Ca0.97Eu0.03)
Si2O2N2 addition（Excitation WL：370 nm）