Synthesis and Luminescence Properties of LiGd(WyMo1-y)2O8-x/2Fx: Eu3+ Red Phosphors

YE Xin-yu; LUO Yang; LIU Song-bin; HOU De-jian; YOU Wei-xiong; XIA Li-bin

doi:10.3788/fgxb20163710.1203

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Synthesis and Luminescence Properties of LiGd(W_yMo_1-y)₂O_8-x/2F_x: Eu³⁺ Red Phosphors

更新时间：2020-08-12

- Synthesis and Luminescence Properties of LiGd(W_yMo_1-y)₂O_8-x/2F_x: Eu³⁺ Red Phosphors
- Chinese Journal of Luminescence Vol. 37, Issue 10, Pages: 1203-1212(2016)
- 作者机构：
  
  1. 江西理工大学冶金与化学工程学院, 江西赣州 341000
  2. 国家离子型稀土资源高效开发利用工程技术研究中心, 江西赣州 341000
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20163710.1203
  CLC： O482.31
- Received：01 May 2016，
  
  Revised：30 May 2016，
  
  Published：05 October 2016
- 稿件说明：
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叶信宇, 罗洋, 刘松彬等. LiGd(WyMo1-y)2O8-x/2Fx:Eu3+红色荧光粉的制备和发光特性[J]. 发光学报, 2016,37(10): 1203-1212

YE Xin-yu, LUO Yang, LIU Song-bin etc. Synthesis and Luminescence Properties of LiGd(WyMo1-y)2O8-x/2Fx: Eu3+ Red Phosphors[J]. Chinese Journal of Luminescence, 2016,37(10): 1203-1212
叶信宇, 罗洋, 刘松彬等. LiGd(WyMo1-y)2O8-x/2Fx:Eu3+红色荧光粉的制备和发光特性[J]. 发光学报, 2016,37(10): 1203-1212 DOI： 10.3788/fgxb20163710.1203.

YE Xin-yu, LUO Yang, LIU Song-bin etc. Synthesis and Luminescence Properties of LiGd(WyMo1-y)2O8-x/2Fx: Eu3+ Red Phosphors[J]. Chinese Journal of Luminescence, 2016,37(10): 1203-1212 DOI： 10.3788/fgxb20163710.1203.

摘要

采用高温固相法制备了LiGd（W

）

：0.4Eu

（

=0~1，

=0~1）系列白光LED用红色荧光粉。通过扫描电子显微镜、X射线衍射仪、红外光谱仪、荧光光谱仪对荧光粉的形貌、结构、光学性能进行了表征。结果表明，Eu

、F

和WO

的掺杂没有改变LiGd（MoO

）

的四方晶系白钨矿结构；F

和WO

最佳掺杂量分别为

=0.6，

=0.4。在396 nm激发下，LiGd（W

0.4

0.6

）

7.7

0.6

：0.4Eu

的发光强度比未掺杂样品提高了60%，量子效率可达66.23 %。当温度升高至100 ℃时，样品的发射强度降为25 ℃时的76.6%。在460 nm激发下，样品的最强窄带发射峰位于617 nm处，归属于

跃迁，色坐标为（0.649 9，0.346 3）。

能级的荧光寿命曲线遵循单指数规律衰减，随着F

掺杂浓度的增加，

能级的荧光寿命不断增加，归因于低声子能量的F

掺入有效减小了能量的无辐射跃迁概率。所制备的LiGd（W

0.4

0.6

）

7.7

0.6

：0.4Eu

荧光粉有望应用于白光LED。

Abstract

LiGd(W

)

:0.4Eu

red phosphors with different F

and WO

doping concentrations for white LEDs were synthesized by the solid state reaction method. Morphology

structure

optical properties of LiGd(W

)

:0.4Eu

phosphors were studied by scanning electron microscope(SEM)

X-ray diffraction (XRD)

Fourier transform infrared spectroscopy (FT-IR) and fluorescence spectrometer. The results show that the samples doped with Eu

and WO

have tetragonal scheelite structure. The optimum doping content of F

and WO

=0.6 and

=0.4

respectively. Under 396 nm excitation

the maximum emission intensity of LiGd(W

0.4

0.6

)

7.7

0.6

:0.4Eu

in which the quantum efficiency is 66.23% is higher than 60% in comparison with LiGd(MoO

)

:0.4Eu

. When the temperature turned up to 100 ℃

the emssion intensity of LiGd(W

0.4

0.6

)

7.7

0.6

:0.4Eu

is 76.6% of the initial value at 25 ℃. Under 460 nm excitation

intense red emissions corresponding to

transitions of Eu

are observed. The chromaticity coordinates of LiGd(W

0.4

0.6

)

7.7

0.6

:0.4Eu

phosphors are (0.649 9

0.346 3). Decay curve of

state for as-prepared samples fits the single order exponential behavior

the lifetime of

increases with the increasing of F

doping concentration

which is due to the reduction of non-radiative transition probability results from the low phonon energy property of F

. LiGd-(W

0.4

0.6

)

7.7

0.6

:0.4Eu

phosphors are suitable for the white LEDs.

关键词

Keywords

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