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Eu3+ ,Dy3+ ,Sm3+掺杂Ca(Sr,Ba)WO4的光谱性质
Optical Properties of Eu3+ ,Dy3+ ,Sm3+ Doped Ca(Sr,Ba)WO4
- 发光学报 2011年32卷第7期 页码：699-703
- 作者机构：
1. 河北大学 物理科学与技术学院,河北 保定,071002
2. 河北大学 工商学院,河北 保定,071002
3. 河北大学 研究生学院,河北 保定,071002
4. 大连海事大学 物理系,辽宁 大连,116026
- 作者简介：
- 基金信息：国家自然科学基金(50902042)();河北省自然基金(E2010000283)();中国博士后基金(20100480840)();河北大学博士启动基金(Y20091
DOI：10.3788/fgxb20113207.0699
中图分类号： O482.31收稿日期：2011-01-25，
修回日期：2011-02-24，
网络出版日期：2011-07-22，
纸质出版日期：2011-07-22
- 稿件说明：
移动端阅览
杨艳民, 刘冲, 刘云峰, 陈宝玖, 张浩. Eu<sup>3+</sup> ,Dy<sup>3+</sup> ,Sm<sup>3+</sup>掺杂Ca(Sr,Ba)WO<sub>4</sub>的光谱性质[J]. 发光学报, 2011,32(7): 699-703
YANG Yan-min, LIU Chong, LIU Yun-feng, CHEN Bao-jiu, ZHANG Hao. Optical Properties of Eu<sup>3+</sup> ,Dy<sup>3+</sup> ,Sm<sup>3+</sup> Doped Ca(Sr,Ba)WO<sub>4</sub>[J]. Chinese Journal of Luminescence, 2011,32(7): 699-703
杨艳民, 刘冲, 刘云峰, 陈宝玖, 张浩. Eu<sup>3+</sup> ,Dy<sup>3+</sup> ,Sm<sup>3+</sup>掺杂Ca(Sr,Ba)WO<sub>4</sub>的光谱性质[J]. 发光学报, 2011,32(7): 699-703 DOI： 10.3788/fgxb20113207.0699.
YANG Yan-min, LIU Chong, LIU Yun-feng, CHEN Bao-jiu, ZHANG Hao. Optical Properties of Eu<sup>3+</sup> ,Dy<sup>3+</sup> ,Sm<sup>3+</sup> Doped Ca(Sr,Ba)WO<sub>4</sub>[J]. Chinese Journal of Luminescence, 2011,32(7): 699-703 DOI： 10.3788/fgxb20113207.0699.
摘要
采用共沉淀方法制备了稀土离子Eu
3+
Dy
3+
Sm
3+
掺杂的Ca(Sr
Ba)WO
4
发光材料
目的是研究金属阳离子改变对稀土离子发光性质的影响。X射线衍射光谱数据表明
CaWO
4
、SrWO
4
、BaWO
4
都是四方晶系
I4
1
/a
(88)结构
随着阳离子半径增大
衍射峰向小角移动。不同温度制备的BaWO
4
样品X射线衍射光谱数据表明
温度较低时制备的晶体样品X射线衍射峰较宽;当制备温度升高后
晶体样品X射线衍射峰宽变窄。样品的SEM 照片表明
低温制备的样品晶粒尺寸较小
约为100~300 nm;高温制备样品晶粒尺寸较大
约为2~6 m。测试了Eu
3+
Dy
3+
Sm
3+
掺杂的Ca(Sr
Ba)WO
4
发光材料的激发和发射光谱。计算了Eu
3+
掺杂的Ca(Sr
Ba)WO
4
的J-O强度参数
(=2
4)
2
值随着阳离子半径增大迅速减小
经分析它是导致Eu
3+
掺杂的Ca(Sr
Ba)WO
4
的发射强度随着阳离子半径增大迅速减弱的原因。然而Sm
3+
掺杂的SrWO
4
其他两种晶体相比
其发射强度反而增强。根据激发光谱和文献报道
我们认为可能是由于钨酸根离子与稀土离子的能量传递引起的。从Dy
3+
Sm
3+
掺杂的Ca(Sr
Ba)WO
4
的发射光谱可以看到
随着阳离子半径增大发射峰蓝移
发射峰的Stark劈裂减弱。我们用位形坐标图解释了这一现象产生的原因。
Abstract
Eu
3+
Dy
3+
Sm
3+
doped Ca(Sr
Ba)WO
4
phosphors were synthesized by the co-precipitation method in order to investigate the effect of different metallic cations on luminescence properties of rare earth ions. The data of X ray diffraction (XRD) indicated that the crystal structures of CaWO
4
SrWO
4
BaWO
4
belong to tetragonal
I4
1
/a
(88) and the diffraction peaks moved towards smaller angle with the increasing diameter of the metal cation. The data of X-ray diffraction (XRD) of BaWO
4
synthesized under different temperatures showed that the diffraction peaks were broader under lower synthesized temperature
which can be attributed to the smaller particle sizes (about 100~300 nm seen from SEM morphology) of BaWO
4
phosphors under lower synthesized temperature. The emission spectrum and excitation spectrum of Eu
3+
Dy
3+
Sm
3+
doped Ca(Sr
Ba)WO
4
phosphors were measured. J-O strength parameters
(
=2
4) of Eu
3+
ion
were calculated. The data indicated that
2
decreased with increasing diameter of the metal cation
which can be used to explain the decrease of emission intensity of Eu
3+
doped Ca(Sr
Ba)WO
4
with increasing diameter of the metal cation. However
the emission intensity of Sm
3+
doped SrWO
4
phosphors were more stronger than that of Sm
3+
doped Ca(Ba)WO
4
which can be explained by the energy transfer between WO
2-
4
and rare earth ions. It can be seen from the emission spectrum of Dy
3+
Sm
3+
doped Ca(Sr
Ba)WO
4
the emission peaks moved towards shorter wavelength and their bandwidths were reduced
which was explained by the configurational coordinate diagram.
关键词
Keywords
references
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