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Eu2+在Ba2Ca(BO3)2中的发光特性及浓度猝灭
Luminescent Properties and Concentration Quenching of Eu2+ in Ba2 Ca(BO3)2
- 发光学报 2012年33卷第7期 页码：729-735
- 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 研究生学院, 河北 保定 071002
- 作者简介：
- 基金信息：国家自然科学基金(50902042)();河北省自然科学基金(E2009000209();E2010000283)();河北省教育厅基金( 2009313)();发光与
DOI：10.3788/fgxb20123307.0729
中图分类号： TN383.1纸质出版日期：2012-7-10，
网络出版日期：2012-7-10，
收稿日期：2012-4-5，
修回日期：2012-5-18，
扫 描 看 全 文
王志军, 刘冲, 杨志平, 李盼来, 郭庆林. Eu<sup>2+</sup>在Ba<sub>2</sub>Ca(BO<sub>3</sub>)<sub>2</sub>中的发光特性及浓度猝灭[J]. 发光学报, 2012,33(7): 729-735
WANG Zhi-jun, LIU Chong, YANG Zhi-ping, LI Pan-lai, GUO Qing-lin. Luminescent Properties and Concentration Quenching of Eu<sup>2+</sup> in Ba<sub>2</sub> Ca(BO<sub>3</sub>)<sub>2</sub>[J]. Chinese Journal of Luminescence, 2012,33(7): 729-735
王志军, 刘冲, 杨志平, 李盼来, 郭庆林. Eu<sup>2+</sup>在Ba<sub>2</sub>Ca(BO<sub>3</sub>)<sub>2</sub>中的发光特性及浓度猝灭[J]. 发光学报, 2012,33(7): 729-735 DOI： 10.3788/fgxb20123307.0729.
WANG Zhi-jun, LIU Chong, YANG Zhi-ping, LI Pan-lai, GUO Qing-lin. Luminescent Properties and Concentration Quenching of Eu<sup>2+</sup> in Ba<sub>2</sub> Ca(BO<sub>3</sub>)<sub>2</sub>[J]. Chinese Journal of Luminescence, 2012,33(7): 729-735 DOI： 10.3788/fgxb20123307.0729.
摘要
采用高温固相法
以CaCO
3
(A.R)、BaCO
3
(A.R)、H
3
BO
3
(A.R)和Eu
2
O
3
(99.99%)为原料制备了Ba
2
Ca(BO
3
)
2
∶Eu
2+
绿色发光材料
测量了材料的晶体结构、发光特性及色坐标等。Ba
2
Ca(BO
3
)
2
∶Eu
2+
材料的激发光谱覆盖200~500 nm的紫外-可见光区。在400 nm近紫外光激发下
材料的发射光谱为一主峰位于537 nm的非对称宽谱
对应于Eu
2+
的4f
6
5d
1
→4f
7
特征跃迁。研究发现
随Eu
2+
掺杂浓度的增大
Ba
2
Ca-(BO
3
)
2
∶Eu
2+
材料的发射强度呈现先增大、后减小的变化趋势
最大发射强度对应的Eu
2+
掺杂摩尔分数为2%。造成发射强度下降的原因为浓度猝灭
其机理为电偶极-电偶极相互作用。依据晶格常数及实验光谱数据
得出临界距离
R
c
分别为2.64 nm和2.11 nm。随Eu
2+
掺杂浓度的增大
Ba
2
Ca(BO
3
)
2
∶Eu
2+
材料的色坐标变化微小。计算得到Ba
2
Ca(BO
3
)
2
∶2%Eu
2+
的转换效率约为72%。
Abstract
Ba
2
Ca(BO
3
)
2
∶Eu
2+
phosphor was synthesized by a high temperature solid-state method. CaCO
3
(A.R)
BaCO
3
(A.R)
H
3
BO
3
(A.R) and Eu
2
O
3
(99.99%) were used as raw materials. Its crystal structure
luminescent characteristics and Commission International de lEclairage (CIE) chromaticity coordinates values were measured. Under the ultraviolet to visible light irradiation
Ba
2
Ca(BO
3
)
2
∶Eu
2+
shows an asymmetrically single green emission band with a maximum at 537 nm
which corresponds to the 4f
6
5d
1
→4f
7
transition of Eu
2+
. The emission intensity of Ba
2
Ca(BO
3
)
2
∶Eu
2+
was influenced by Eu
2+
molefraction
at first
it increases with the increase of Eu
2+
mole fraction
and reaches a maximum value at 2%Eu
2+
then decreases with further increasing its concentration because of the concentration quenching effect. And the concentration quenching mechanism is verified to be dipole-dipole interaction. According to the crystal structure data and the experimental spectral data
the critical distances(
R
c
) can be obtained
and are 2.64 nm and 2.11 nm
respectively. Moreover
with increasing the Eu
2+
doped content
the CIE chromaticity coordinates of the samples were slightly varied. For Ba
2
Ca(BO
3
)
2
∶2%Eu
2+
the quantum efficiency is approximately 72%.
关键词
发光Eu2+Ba2Ca(BO3)2浓度猝灭
Keywords
luminescenceEu2+Ba2Ca(BO3)2concentration quenching
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