Microwave Synthesis of Yellow-green Phosphors CaMoO4: Dy and Luminescence Enhancement of PO43- Doping

ZHAI Yong-qing; HAN Ying; ZHANG Wan; YIN Yan-jie; ZHAO Xin; WANG Li-li

doi:10.3788/fgxb20163707.0765

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Microwave Synthesis of Yellow-green Phosphors CaMoO₄: Dy and Luminescence Enhancement of PO₄^3- Doping

更新时间：2020-08-12

- Microwave Synthesis of Yellow-green Phosphors CaMoO₄: Dy and Luminescence Enhancement of PO₄^3- Doping
- Chinese Journal of Luminescence Vol. 37, Issue 7, Pages: 765-772(2016)
- 作者机构：
  
  河北大学化学与环境科学学院,河北保定,071002
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20163707.0765
  CLC： O482.31
- Received：07 March 2016，
  
  Revised：09 May 2016，
  
  Published：05 July 2016
- 稿件说明：
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翟永清, 韩英, 张弯等. CaMoO4:Dy黄绿色荧光粉的微波合成及掺杂PO43-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 CaMoO4: Dy and Luminescence Enhancement of PO43- Doping[J]. Chinese Journal of Luminescence, 2016,37(7): 765-772
翟永清, 韩英, 张弯等. CaMoO4:Dy黄绿色荧光粉的微波合成及掺杂PO43-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 CaMoO4: Dy and Luminescence Enhancement of PO43- Doping[J]. Chinese Journal of Luminescence, 2016,37(7): 765-772 DOI： 10.3788/fgxb20163707.0765.

摘要

采用微波辐射法合成了一系列的Ca

MoO

0.12)和Ca

0.98

(MoO

)

1-1.5

(PO

)

:0.02Dy

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

:Dy

晶体结构与CaMoO

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

的

9/2

13/2

跃迁

发光强度随Dy

浓度的增加先增大后减小

当Dy

摩尔分数为0.02时发光强度最大

而后随Dy

浓度的增加

发生了浓度猝灭效应。由Dexter浓度猝灭理论知

浓度猝灭主要为电偶极-电偶极相互作用和Dy

离子间交叉弛豫造成的。在254 nm波长激发下

CaMoO

:Dy

的色坐标集中在黄绿光区域。此外

的掺杂有效提高了CaMoO

:Dy

体系的发光亮度

的最佳掺杂量为

=0.04

此时样品的发光强度比未掺杂样品提高了约19%。

Abstract

A series of yellow-green emitting phosphors Ca

MoO

0.12) and Ca

0.98

-(MoO

)

1-1.5

(PO

)

:0.02Dy

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

:Dy

phosphor powders are well assigned to the tetragonal scheelite-type similar to that of CaMoO

. 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

:Dy

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

9/2

13/2

transition of Dy

. The fluorescence intensity firstly increases with the increase of Dy

concentration in CaMoO

host and then decreases. The optimum luminescence is observed when the mole fraction of Dy

is 0.02. When the mole fraction of Dy

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

ions. Under 254 nm excitation

the chromaticity coordinates of CaMoO

:Dy

are concentrated in yellow-green region. In addition

the emission intensity of the CaMoO

:Dy

system is improved effectively by the doping of anions (PO

). The optimum content(

) is about 0.04 and the luminescence intensity is enhanced about 19% than that of the undoped.

关键词

Keywords

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