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Na+离子掺杂Gd2O3 ∶ Sm3+纳米晶的发光增强
Enhanced Photoluminescence of Na+-doped Gd2O3 ∶ Sm3+ Nanocrystals
- 发光学报 2010年31卷第5期 页码：706-711
- 作者机构：
河南大学 物理与电子学院, 河南 开封 475004
- 作者简介：
- 基金信息：河南省高等学校创新人才培养工程资助课题(200211)();河南大学开放基金(2006)资助项目()
DOI：
中图分类号： O482.31收稿日期：2009-07-11，
修回日期：2009-09-26，
网络出版日期：2010-09-21，
纸质出版日期：2010-09-21
- 稿件说明：
移动端阅览
刘广生, 丁玲红, 张伟风. Na<sup>+</sup>离子掺杂Gd<sub>2</sub>O<sub>3</sub> ∶ Sm<sup>3+</sup>纳米晶的发光增强[J]. 发光学报, 2010,31(5): 706-711
LIU Guang-sheng, DING Ling-hong, ZHANG Wei-feng. Enhanced Photoluminescence of Na<sup>+</sup>-doped Gd<sub>2</sub>O<sub>3</sub> ∶ Sm<sup>3+</sup> Nanocrystals[J]. 发光学报, 2010,31(5): 706-711
刘广生, 丁玲红, 张伟风. Na<sup>+</sup>离子掺杂Gd<sub>2</sub>O<sub>3</sub> ∶ Sm<sup>3+</sup>纳米晶的发光增强[J]. 发光学报, 2010,31(5): 706-711 DOI：
LIU Guang-sheng, DING Ling-hong, ZHANG Wei-feng. Enhanced Photoluminescence of Na<sup>+</sup>-doped Gd<sub>2</sub>O<sub>3</sub> ∶ Sm<sup>3+</sup> Nanocrystals[J]. 发光学报, 2010,31(5): 706-711 DOI：
摘要
采用柠檬酸作燃烧剂
在柠檬酸-硝酸盐体系下制备了Gd
2
O
3
∶ Sm
3+
和Gd
2
O
3
∶ Sm
3+
Na
+
纳米晶。用X射线衍射仪、透射电子显微镜、荧光光谱仪等对样品的结构、形貌和光致发光性能进行了分析。结果表明:所得纳米样品为纯立方相
晶粒尺寸约为30 nm。在室温下
用275 nm激发光激发各样品时
可观测到Sm
3+
离子 的较强发光
其主发射峰位分别位于561.5
603.5
651.5 nm
分别对应着Sm
3+
离子的
4
G
5/2
6
H
5/2
4
G
5/2
6
H
7/2
和
4
G
5/2
6
H
9/2
的电子跃迁
其中以
4
G
5/2
6
H
7/2
跃迁的光谱强度最强。实验表明:Na
+
离子的掺入使得Sm
3+
离子的光发射强度显著增强。对引起样品荧光强度变化的原因进行了分析。
Abstract
The luminescence properties of nanosized lanthanide oxide materials have attracted extensive interest because of their fundamental and technological importance. Gd
2
O
3
has been widely used as host material due to abundant resource in nature. The emission of Sm
3+
ions associated with the intra-4f-shell transition is very efficient and can be observed in the visible and near-infrared regions. Therefore
Sm
3+
ion often plays a very important role in the luminescent processes of material. On the basis of studying on the luminescent properties of Gd
2
O
3
∶ Sm
3+
we have made a comprehensive study on the effect of Na
+
doping on the photoluminescent properties of nanocrystalline Gd
2
O
3
∶ Sm
3+
. Nanocrystalline Gd
2
O
3
∶ Sm
3+
and Gd
2
O
3
∶ Sm
3+
Na
+
have been prepared by combustion synthesis using citric acid as the fuel and metal nitrates as oxidants. The structural
morphological and luminescent properties of the nanocrystals are also investigated. The results show that the samples obtained after annealing at 800 ℃ exist in cubic phase
and the grain size is approximately 30 nm. Photoluminescence properties were investigated for Gd
2
O
3
∶ Sm
3+
and Gd
2
O
3
∶ Sm
3+
Na
+
obtained at different annealing temperatures and different doping contents. The emission spectra of all samples present the characteristic narrow lines arising from the
4
G
5/2
6
H
<
em
>
J transitions (
J
=5/2
7/2
and 9/2) of Sm
3+
ion under 275 nm excitation. The emission intensity of Sm
3+
ion is enhanced with introducing Na
+
ion into Gd
2
O
3
∶ Sm
3+
. The highest emission intensity is observed in Gd
1.88
Sm
0.02
Na
0.10
O
3
whose intensity is 2 times than that of Gd
2
O
3
∶ Sm
3+
. The enhanced luminescence by Na
+
doping is mainly regarded as the results of the flux effect of Na
+
and the creation of oxygen vacancy by Na
+
ion doping. The Na
+
codoping results in the better crystallization and larger grain size
furthermore reduced the luminescence quenching by the surface defects. This fact causes an increase in the luminescent intensity. The oxygen vacancy is resulted from the occupation of Gd
3+
site by Na
+
ion
acting as sensitizer for the effective energy transfer
resulting in the improvement of luminescent intensity. A lot of defects can be induced in the system with a gradual increase of Na
+
content. They act as non-radiative transition channels and thus lead to the luminescence quenching.
关键词
Keywords
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