FENG Shan, XIANG Ming, LEI Ting, MENG Xiao-kang, TAN Jin. Effect of Ba<sup>2+</sup> Substitution and Fluxes on The Crystal Structure and Luminescent Properties of Sr<sub>3</sub>SiO<sub>5</sub>:Eu<sup>2+</sup> Orange Phosphor[J]. Chinese Journal of Luminescence, 2013,34(4): 438-443
FENG Shan, XIANG Ming, LEI Ting, MENG Xiao-kang, TAN Jin. Effect of Ba<sup>2+</sup> Substitution and Fluxes on The Crystal Structure and Luminescent Properties of Sr<sub>3</sub>SiO<sub>5</sub>:Eu<sup>2+</sup> Orange Phosphor[J]. Chinese Journal of Luminescence, 2013,34(4): 438-443 DOI: 10.3788/fgxb20133404.0438.
Effect of Ba2+ Substitution and Fluxes on The Crystal Structure and Luminescent Properties of Sr3SiO5:Eu2+ Orange Phosphor
phosphors were synthesized by high temperature solid state reaction method under a reductive atmosphere. The effects of Ba
2+
substitution for Sr
2+
and fluxes on the crystal structure and the luminescent properties of Sr
3
SiO
5
:Eu
2+
phosphors were investigated by X-ray powder diffraction (XRD)
scanning electron microscopy (SEM)
and fluorescence spectrophotometer. The substitution of the host lattice cation Sr
2+
by Ba
2+
can make the polyhedron enlarged and then cause the shrinking of the neighboring Sr
2+
or Eu
2+
sites
which may explain an increased crystal field. Along with the increase of the Ba
2+
concentration
Eu
2+
occupies the Ba
2+
site by degrees and the crystal field decreases. Thus
the emission wavelengths of the sample display red-shift from 575 nm to 592 nm at first and then blue-shift back to 583 nm. The maximum emission wavelength appears when
n
(Sr):
n
(Ba)=4. The experimental results also indicate that the influence of different flux on the luminescent intensity of the Sr
3
SiO
5
:Eu
2+
phosphors varied: H
3
BO
3
decreased sharply
NH
4
F improved a little and NH
4
Cl improved greatly. The optimum mass fraction was 2% for NH
4
F and 0.3% for NH
4
Cl
respectively.
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references
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