XIAN De-ling, HUANG Ke-long, LI Zhao-jian. Preparation and Spectral Properties of SrAl<sub>12</sub>O<sub>19</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Violet Fluorescent Powder[J]. Chinese Journal of Luminescence, 2007,28(3): 397-401
XIAN De-ling, HUANG Ke-long, LI Zhao-jian. Preparation and Spectral Properties of SrAl<sub>12</sub>O<sub>19</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Violet Fluorescent Powder[J]. Chinese Journal of Luminescence, 2007,28(3): 397-401DOI:
Preparation and Spectral Properties of SrAl12O19:Eu2+,Dy3+ Violet Fluorescent Powder
Strontium aluminates doped with europium and dysprosium have been attracting people's attention for their great stability
high quantum transformation rate and fine luminescence performance. The preparation and spectra properties of yellow-green phosphor SrAl
2
O
4
:Eu
2+
Dy
3+
and blue-green phosphor Sr
4
Al
14
O
25
:Eu
2+
Dy
3+
are commonly researched while those of SrAl
12
O
19
:Eu
2+
Dy
3+
is rarely studied. In this paper
SrAl
12
O
19
:Eu
2+
Dy
3+
violet fluorescent powder was synthesized using SrCO
3
and Al
2
O
3
as raw materials employing high temperature solid-state reaction
whose emission spectrum located at 395nm. The crystal structure was analysised by X-ray diffraction(XRD) when n
Sr
:n
Al
=1:12. The XRD results suggested the characteristic peaks of Sr
4
Al
14
O
25
gradurally decreased while those of SrAl
12
O
19
increased by degrees when reaction temperature rised from 1150℃ to 1250℃. That's to say
the change of reaction temperature brought about the transformation of crystal structure. The excitation and emission spectra were tested by fluorescence spectrophotometer. When the reaction temperature was 1150
1200
1250℃ respectively
the ratio of Sr and Al differed from 1:6 to 1:18 in order to investigate the corporate effect of matrix composing and reaction temperature on spectra properties. According to the binary phase diagram of SrO and Al
2
O
3
the lower of SrO content and the higher of Al
2
O
3
content
the higher of the reaction temperature of corresponding strontium aluminates. With the content of Al in matrix increasing and reaction temperature rising
the transformation of crystal structure might change the crystal field environment
leading to the variety of emission spectra. The emission spectra shifted from 490nm to 395nm. The luminescence intensity of SrAl
12
O
19
:Eu
2+
D
+
t to be the strongest under the condition that n
Sr
:n
Al
=1:12 and reaction temperature was 1 250℃. The decay curve investigation was also tested in fluorescence spectrophotometer
which showed SrAl
12
O
19
:Eu
2+
Dy
3+
has no afterglow performance
which may correspond with the spinel structure of SrAl
12
O
19
. The preparation and spectra properties of SrAl
12
O
19
:Eu
2+
Dy
3+
violet fluorescent powder were studied. The effect of reaction temperature and the matrix composing on crystal structure and emission spectra was investigated. The research may be helpful for correlative workers.
关键词
SrAl12O19EuDy固相法发射光谱
Keywords
SrAl12O19EuDysolid-state reactionemission spectra
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