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白光LED用蓝绿色荧光粉 Sr1-xBaxAl2O4∶Eu2+的发光性质
Luminescence Properties of Blue-green Phosphors Sr1-xBaxAl2O4∶Eu2+ for White LED
- 发光学报 2011年32卷第8期 页码：755-760
- 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 电子信息工程学院,河北 保定,071002
- 作者简介：
- 基金信息：河北省自然科学基金(F2009000217)资助项目()
DOI：10.3788/fgxb20113208.0755
中图分类号： O482.31收稿日期：2011-04-14，
修回日期：2011-06-17，
网络出版日期：2011-08-22，
纸质出版日期：2011-08-22
- 稿件说明：
移动端阅览
杨志平, 周东站, 马淑媛, 于红伟, 刘玉峰, 李旭. 白光LED用蓝绿色荧光粉 Sr<sub>1-<em>x</em></sub>Ba<sub><em>x</em></sub>Al<sub>2</sub>O<sub>4</sub>∶Eu<sup>2+</sup>的发光性质[J]. 发光学报, 2011,32(8): 755-760
YANG Zhi-ping, ZHOU Dong-zhan, MA Shu-yuan, YU Hong-wei, LIU Yu-feng, LI Xu. Luminescence Properties of Blue-green Phosphors Sr<sub>1-<em>x</em></sub>Ba<sub><em>x</em></sub>Al<sub>2</sub>O<sub>4</sub>∶Eu<sup>2+</sup> for White LED[J]. Chinese Journal of Luminescence, 2011,32(8): 755-760
杨志平, 周东站, 马淑媛, 于红伟, 刘玉峰, 李旭. 白光LED用蓝绿色荧光粉 Sr<sub>1-<em>x</em></sub>Ba<sub><em>x</em></sub>Al<sub>2</sub>O<sub>4</sub>∶Eu<sup>2+</sup>的发光性质[J]. 发光学报, 2011,32(8): 755-760 DOI： 10.3788/fgxb20113208.0755.
YANG Zhi-ping, ZHOU Dong-zhan, MA Shu-yuan, YU Hong-wei, LIU Yu-feng, LI Xu. Luminescence Properties of Blue-green Phosphors Sr<sub>1-<em>x</em></sub>Ba<sub><em>x</em></sub>Al<sub>2</sub>O<sub>4</sub>∶Eu<sup>2+</sup> for White LED[J]. Chinese Journal of Luminescence, 2011,32(8): 755-760 DOI： 10.3788/fgxb20113208.0755.
摘要
采用高温固相法在还原气氛中合成Sr
1-
x
Ba
x
Al
2
O
4
∶Eu
2+
荧光材料。XRD显示
当钡掺杂量
x
<
0.4时
对应样品主要为单斜SrAl
2
O
4
晶体结构;当
x
0.4时
对应样品主要为简单六方BaAl
2
O
4
晶体结构。在360 nm激发下
样品的发射光谱随
x
的增加由单一的绿光发射(
max
=516 nm)逐渐转变为蓝绿光双发射(
max1
=441 nm
max2
=486 nm)。在Eu
2+
摩尔分数为0.29%时
双发射峰强度最强;继续增加Eu
2+
浓度
将出现浓度猝灭。研究表明
Sr
1-
x
Ba
x
Al
2
O
4
∶Eu
2+
的浓度猝灭机理为电偶极-电偶极相互作用。
Abstract
Sr
1-
x
Ba
x
Al
2
O
4
∶Eu
2+
phosphors were synthesized in a reducing atmosphere by high temperature solid state method at 1 350 ℃. The patterns of XRD indicated that the crystal structure of the phosphors are the monoclinic phase of SrAl
2
O
4
when
x
<
0.4 and the simple hexagonal phase of BaAl
2
O
4
when
x
0.4 because of crystal lattice expands with Ba
2+
ion substitution for Sr
2+
ion. Photoluminescence experiments were carried out to study the luminescence properties of the phosphors excited under 360 nm. The results showed that emission spectra gradually changed from single green emission (
max
=516 nm) to blue-green dual-emission (
max1
= 441 nm
max2
=486 nm) with the increase of
x
. When
x
was 0.5
there was a better property in Sr
0.5
Ba
0.5
Al
2
O
4
∶Eu
2+
. From the relationship between the concentration of Eu
2+
ion and the intensities of emissions in Sr
0.5
Ba
0.5
Al
2
O
4
∶
y
%Eu
2+
we get that the maximum dual-emission intensity when
y
=0.29%. There exist a concentration quenching effect in Sr
0.5
Ba
0.5
Al
2
O
4
∶Eu
2+
and the study points out that the mechanism of concentration quenching effect is electric dipole-dipole interaction.
关键词
Keywords
references
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