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Na3La2(BO3)3：Sm3+的合成及其光谱特性
Synthesis and Spectral Characteristics of Sm3+ Doped Na3La2(BO3)3
- 发光学报 2001年22卷第3期 页码：237-242
- 作者机构：
1. 中国科学技术大学化学系 合肥,230026
2. 中国科学院北京人工晶体研究发展中心 北京,100080
- 作者简介：
- 基金信息：国家自然科学基金资助项目(59872036)()
DOI：
中图分类号： O482.31收稿日期：2000-08-10，
修回日期：2001-01-02，
纸质出版日期：2001-08-30
- 稿件说明：
移动端阅览
张国春, 傅佩珍, 王国富, 郭范, 官向国. Na<sub>3</sub>La<sub>2</sub>(BO<sub>3</sub>)<sub>3</sub>：Sm<sup>3+</sup>的合成及其光谱特性[J]. 发光学报, 2001,22(3): 237-242
ZHANG Guo-chun, FU Pei-zhen, WANG Guo-fu, GUO Fan, GUAN Xiang-guo. Synthesis and Spectral Characteristics of Sm<sup>3+</sup> Doped Na<sub>3</sub>La<sub>2</sub>(BO<sub>3</sub>)<sub>3</sub>[J]. Chinese Journal of Luminescence, 2001,22(3): 237-242
张国春, 傅佩珍, 王国富, 郭范, 官向国. Na<sub>3</sub>La<sub>2</sub>(BO<sub>3</sub>)<sub>3</sub>：Sm<sup>3+</sup>的合成及其光谱特性[J]. 发光学报, 2001,22(3): 237-242 DOI：
ZHANG Guo-chun, FU Pei-zhen, WANG Guo-fu, GUO Fan, GUAN Xiang-guo. Synthesis and Spectral Characteristics of Sm<sup>3+</sup> Doped Na<sub>3</sub>La<sub>2</sub>(BO<sub>3</sub>)<sub>3</sub>[J]. Chinese Journal of Luminescence, 2001,22(3): 237-242 DOI：
摘要
本文采用固相反应法
合成了一系列掺Sm
3+
的Na
3
La
2
(BO
3
)
3
[Na
3
(La1-xSmx)2(BO3)3]发光体
X射线粉末衍射数据分析表明它们属于正交晶系
空间群为
Amm
2。测量了红外光谱、荧光光谱
观察到在599nm、645nm处有较强的荧光发射
并研究了发光强度与Sm
3+
离子浓度(
x
)的关系
确定了Sm
3+
离子在Na
3
La
2
(BO
3
)
3
基质中发光的适宜浓度。
Abstract
In recent years
the borate luminescence materials have received much attention owing to their low synthetic temperature and high luminescent efficiency. In order to search for the new luminescent material
the synthesis and luminescence properties of Na
3
(La
1-x
Sm
x
)
2
(BO
3
)
3
(
x
=0～0.10) were firstly reported in this paper. The samples in polycrystalline form were synthesized by the conventional solid state reaction. The mixture of Na
2
CO
3
La
2
O
3
Sm
2
O
3
and H
3
BO
3
with an excess of 5 mol% were preheating at 500℃ for 10 hours
then sintered 24 hours at 720～750℃for Na
3
(La
1-x
Sm
x
)
2
(BO
3
)
3
(
x
=0.005～0.10)
and 935℃ for Na
3
La
2
(BO
3
)
3
. In the course of experiment
the purity of all samples was checked by X-ray diffraction (XRD). The single phase powder of Na
3
(La
1-x
Sm
x
)
2
(BO
3
)
3
in range of 0.0～1.0mol% were obtained when repeated heat treatment caused no further changes in the X-ray powder diffraction patterns. X-ray diffraction analysis shows that all these compounds are isomorphous with Na
3
La
2
(BO
3
)
3
which belongs to orthorhombic systems
space group
Amm
2. This indicats that the La
3+
ions(
r
=0.105nm) in Na
3
La
2
(BO
3
)
3
can be partly replaced by the smaller rare earth ions Sm
3+
(
r
=0.096nm) without change of crystal structure. The infrared spectra of the compounds Na
3
La
2
(BO
3
)
3
(a)
Na
3
(La
0.995
Sm
0.005
)
2
(BO
3
)
3
(b) and Na
3
(La
0.94
Sm
0.06
)
2
(BO
3
)
3
(c) scanned between 400～2000cm
-1
in the transmittance mode were measured. The results were in agreement with the characteristic values of the BO
3
3-
groups. The minor difference observed in the infrared spectra of (b) and (c) at 450～550 cm
-1
might be due to the changes in the Sm and La ions and their ionic radii. The luminescent properties of Sm
3+
in Na
3
La
2
(BO
3
)
3
host were investigated by the excitation and emission spectra at room temperature. The emission spectrum obtained for Na
3
La
2
(BO
3
)
3
:Sm
3+
under 400nm excitation at room temperature in range of 500～750nm was shown in Fig.2(a). There were four main emission peaks at near 564
599
645 and 707nm
among which the intensity of the 599nm line was the highest. These emission peaks were all narrow sharp peak not broad bands. They originated from the f f transitions of Sm
3+
ions 4f electrons
which assigned to
4
G
5/2
4
H
5/2
transition between 550～570nm
4
G
5/2
6
H
7/2
transitions between 580～610nm
4
G
5/2
6
H
9/2
transition between 630～655nm and
4
G
5/2
6
H
11/2
transitions between 700～710nm
respectively. They belonged to the characteristic emission of Sm
3+
ions. The excitation spectrum for Sm
3+
599nm emission recorded at room temperature showed lines corresponding to transitions
6
H
5/2
(4K
4L)
17/2
(345nm)
6
H
5/2
(4D
6P)
15/2
(362nm)
6
H
5/2
4
L
17/2
(375nm)
6
H
5/2
4
K
11/2
(400nm)
6
H
5/2
4
M
19/2
(
6
P
4
P)
5/2
(418nm)
and
6
H
5/2
4
I
13/2
(
4
I
9/2
)(475nm). As we can see in Fig.2(b). The intensity of the transition at 400nm was found to be the highest in all the spectra. It showed that the strongest fluorescence emission at 599nm could be obtained under 400nm excitation. At room temperature
the emission spectra of Na
3
(La
1-x
Sm
x
)
2
(BO
3
)
3
at different concentration were recorded by the excitation of 400nm. The relative peak heights can change with the concentration of Sm
3+
while the peak positions remain practically unchanged. The relationship between fluorescent intensities of 599nm emission peak of Sm
3+
and act ive rare earth ion concent rat ions in Na
3
(La
1-x
Sm
x
)
2
(BO
3
)
3
was described in Fig.4.It shows that Sm
3+
luminescence exhibits the concentration quenching effect
which might be due to energyt ransfer resulted from higher concentrations and the cross relaxation process among mate levels pairs
for example
4
G
5/2
6
F
9/2
and
6
F
9/2
6
H
5/2
energy levels.So the suitable concentration of Sm
3+
luminescence in the Na
3
La
2
(BO
3
)
3
host was about 6mol%.
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