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河北大学 化学与环境科学学院,河北 保定,071002
纸质出版日期:2016-7-5,
收稿日期:2016-3-7,
修回日期:2016-5-9,
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翟永清, 韩英, 张弯等. CaMoO<sub>4</sub>:Dy黄绿色荧光粉的微波合成及掺杂PO<sub>4</sub><sup>3-</sup>的荧光增强效应[J]. 发光学报, 2016,37(7): 765-772
ZHAI Yong-qing, HAN Ying, ZHANG Wan etc. Microwave Synthesis of Yellow-green Phosphors CaMoO<sub>4</sub>: Dy and Luminescence Enhancement of PO<sub>4</sub><sup>3-</sup> Doping[J]. Chinese Journal of Luminescence, 2016,37(7): 765-772
翟永清, 韩英, 张弯等. CaMoO<sub>4</sub>:Dy黄绿色荧光粉的微波合成及掺杂PO<sub>4</sub><sup>3-</sup>的荧光增强效应[J]. 发光学报, 2016,37(7): 765-772 DOI: 10.3788/fgxb20163707.0765.
ZHAI Yong-qing, HAN Ying, ZHANG Wan etc. Microwave Synthesis of Yellow-green Phosphors CaMoO<sub>4</sub>: Dy and Luminescence Enhancement of PO<sub>4</sub><sup>3-</sup> Doping[J]. Chinese Journal of Luminescence, 2016,37(7): 765-772 DOI: 10.3788/fgxb20163707.0765.
采用微波辐射法合成了一系列的Ca
1-
x
MoO
4
:
x
Dy
3+
(0
<
x
0.12)和Ca
0.98
(MoO
4
)
1-1.5
y
(PO
4
)
y
:0.02Dy
3+
(0
y
0.10)黄绿色荧光粉
分别用X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)和荧光分光光度计对荧光粉的物相结构、微观形貌、发光特性进行了分析和表征。结果表明:所制得的CaMoO
4
:Dy
3+
晶体结构与CaMoO
4
相似
为四方晶系、白钨矿结构。样品颗粒呈立方形
边长约为5 m
且是由尺寸约为120~540 nm的类球形小颗粒组成。样品的最大激发峰位于300 nm处。发射光谱由一系列尖峰组成
最强发射峰位于572 nm处
对应于Dy
3+
的
4
F
9/2
6
H
13/2
跃迁
发光强度随Dy
3+
浓度的增加先增大后减小
当Dy
3+
摩尔分数为0.02时发光强度最大
而后随Dy
3+
浓度的增加
发生了浓度猝灭效应。由Dexter浓度猝灭理论知
Dy
3+
浓度猝灭主要为电偶极-电偶极相互作用和Dy
3+
离子间交叉弛豫造成的。在254 nm波长激发下
CaMoO
4
:Dy
3+
的色坐标集中在黄绿光区域。此外
PO
4
3-
的掺杂有效提高了CaMoO
4
:Dy
3+
体系的发光亮度
PO
4
3-
的最佳掺杂量为
y
=0.04
此时样品的发光强度比未掺杂样品提高了约19%。
A series of yellow-green emitting phosphors Ca
1-
x
MoO
4
:
x
Dy
3+
(0
<
x
0.12) and Ca
0.98
-(MoO
4
)
1-1.5
y
(PO
4
)
y
:0.02Dy
3+
(0
y
0.10) were fabricated
via
microwave radiation method. The phase structure
morphology and luminescence properties of the as-fabricated samples were investigated by X-ray diffraction (XRD)
scanning electron microscope (SEM)
and fluorescence spectrophotometer
respectively. The results reveal that the obtained CaMoO
4
:Dy
3+
phosphor powders are well assigned to the tetragonal scheelite-type similar to that of CaMoO
4
. The particles are approximately cubic in shape with the side length about 5m
and cubic big particle is composed by a large number of spherical-like particles with a diameter of about 120-540 nm. The maximum excitation peak of CaMoO
4
:Dy
3+
is located at 300 nm. The emission spectrum is composed of a series of sharp peaks with the strongest emission peak at 572 nm
which is ascribed to the
4
F
9/2
6
H
13/2
transition of Dy
3+
. The fluorescence intensity firstly increases with the increase of Dy
3+
concentration in CaMoO
4
host and then decreases. The optimum luminescence is observed when the mole fraction of Dy
3+
is 0.02. When the mole fraction of Dy
3+
exceeds 0.02
luminescence intensity reduces obviously due to the concentration quenching. The mechanism of concentration quenching is mainly caused by the electric dipole-dipole interaction and the cross relaxation between Dy
3+
ions. Under 254 nm excitation
the chromaticity coordinates of CaMoO
4
:Dy
3+
are concentrated in yellow-green region. In addition
the emission intensity of the CaMoO
4
:Dy
3+
system is improved effectively by the doping of anions (PO
4
3-
). The optimum content(
y
) is about 0.04 and the luminescence intensity is enhanced about 19% than that of the undoped.
CaMoO4:Dy3+PO43-微波辐射法发光
CaMoO4:Dy3+PO43-microwave radiation methodluminescence
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