Sol-gel Chemical Synthesis of Eu<sup>3+</sup>-doped Lanthanum Cerium Composite Oxide Phosphor

Ya-xin YUE; Lu LIU; Shi-kao SHI; Ji-ye WANG; Rui-long ZONG; Shu-ping WANG

doi:10.3788/fgxb20204106.0664

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Sol-gel Chemical Synthesis of Eu³⁺-doped Lanthanum Cerium Composite Oxide Phosphor

Synthesis and Properties of Materials | 更新时间：2020-09-15

- Sol-gel Chemical Synthesis of Eu³⁺-doped Lanthanum Cerium Composite Oxide Phosphor
- Chinese Journal of Luminescence Vol. 41, Issue 6, Pages: 664-669(2020)
- 作者机构：
  
  1.河北师范大学化学与材料科学学院, 河北石家庄 050024
  2.清华大学化学系, 北京 100084
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;Technical Innovation Foundation of Hebe
- DOI：10.3788/fgxb20204106.0664
  CLC： O482.31
- Received：30 March 2020，
  
  Accepted：24 April 2020，
  
  Published：2020-06
- 稿件说明：
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Ya-xin YUE, Lu LIU, Shi-kao SHI, et al. Sol-gel Chemical Synthesis of Eu³⁺-doped Lanthanum Cerium Composite Oxide Phosphor[J]. Chinese journal of luminescence, 2020, 41(6): 664-669.
DOI：

Ya-xin YUE, Lu LIU, Shi-kao SHI, et al. Sol-gel Chemical Synthesis of Eu³⁺-doped Lanthanum Cerium Composite Oxide Phosphor[J]. Chinese journal of luminescence, 2020, 41(6): 664-669. DOI： 10.3788/fgxb20204106.0664.

摘要

以硝酸铈、氧化镧和氧化铕为原料，柠檬酸为络合剂，采用溶胶-凝胶化学法合成了稀土Eu

掺杂的镧铈复合氧化物（镧铈的量比分别为1：1和1：2）荧光粉。通过X射线衍射、扫描电镜、拉曼光谱和光致发光等手段研究了不同组成下样品的结构、发光及显色性能。结果表明，所得复合氧化物样品与CeO

相似，均为立方萤石结构，空间群为

，但复合氧化物的晶胞参数

大于CeO

。粉体形貌近似球形，颗粒均匀，粒径范围在50~60 nm之间。在466 nm蓝光激发下，位于613 nm和628 nm处Eu

的

→

特征红色跃迁为主发射峰。固定Eu

掺杂摩尔分数为15%，镧铈复合氧化物的荧光强度明显优于氧化铈基质，而当基质中镧铈的量比为1：1时，样品的荧光进一步优化达到最强。由于466 nm对应的蓝光区与半导体GaN芯片的发光重合，这有利于Eu

掺杂的镧铈复合氧化物在固态照明中的应用。

Abstract

The Eu

-doped lanthanum cerium composite oxides (the molar ratio of La to Ce is 1:1 and 1:2

respectively) were sol-gel synthesized by using cerium nitrate

lanthanum and europium oxide as raw materials

and appropriate amount of citric acid as chelating agent. The crystal structure

luminescent properties and chromaticity coordinate of the samples with different composition were analyzed through X-ray diffraction patterns

scanning electron microscope

Raman spectra and photoluminescence. The results reveal that the composite samples are of cubic fluorite structure with the space group

which is almost identical with CeO

except for larger lattice parameter

. The powder morphology shows round shape and the particle sizes are around 50-60 nm. Excited with 466 nm blue light

the characteristic red transition (

→

) emission of Eu

at 613 nm and 628 nm plays predominant roles. As the doping concentration of Eu

is stable at 15%

the luminescence intensity of lanthanum cerium composite is obviously superior to CeO

and the luminescence is further optimized as the molar ratio of La to Ce is 1:1. Due to the coincidence of 466 nm blue light with the emission of GaN chips

the Eu

-doped lanthanum cerium composite oxide may potentially be used in solid state lighting fields.

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Keywords

references

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⁰

Sol-gel Chemical Synthesis of Eu3+-doped Lanthanum Cerium Composite Oxide Phosphor

DOI：10.3788/fgxb20204106.0664

摘要

Abstract

关键词

Keywords

references

Sol-gel Chemical Synthesis of Eu³⁺-doped Lanthanum Cerium Composite Oxide Phosphor