Optical Properties of Eu2+-activated Blue-emitting Phosphor LiCaPO4 under Ultraviolet Excitation

YANG Zhi-ping; WANG Feng-he; GUO Ying-nan; LI Xu; MA Xin; WEN Jian-wei

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Optical Properties of Eu²⁺-activated Blue-emitting Phosphor LiCaPO₄ under Ultraviolet Excitation

paper | 更新时间：2020-08-12

- Optical Properties of Eu²⁺-activated Blue-emitting Phosphor LiCaPO₄ under Ultraviolet Excitation
- Chinese Journal of Luminescence Vol. 31, Issue 2, Pages: 181-184(2010)
- 作者机构：
  
  1. 河北大学物理科学与技术学院发光与显示研究所,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：
- DOI：
  CLC： O482.31
- Received：25 October 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 April 2010，
  
  Published：30 April 2010
- 稿件说明：
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YANG Zhi-ping, WANG Feng-he, GUO Ying-nan, et al. Optical Properties of Eu²⁺-activated Blue-emitting Phosphor LiCaPO₄ under Ultraviolet Excitation[J]. Chinese journal of luminescence, 2010, 31(2): 181-184.
DOI：

YANG Zhi-ping, WANG Feng-he, GUO Ying-nan, et al. Optical Properties of Eu²⁺-activated Blue-emitting Phosphor LiCaPO₄ under Ultraviolet Excitation[J]. Chinese journal of luminescence, 2010, 31(2): 181-184. DOI：

摘要

采用高温固相法合成了LiCaPO

: Eu

蓝色发光粉

并对其发光特性进行了研究。该发光粉发射峰值位于470 nm

属于Eu

的4f

→4f的特征跃迁发射

与结构相似的LiSrPO

: Eu

和NaBaPO

: Eu

相比其峰值有明显红移。Eu

在LiCaPO

晶体中可被250~440 nm光有效激发

这与紫外发光二极管的发射光谱(350~410 nm)匹配。考察了Eu

的掺杂浓度对发光强度的影响

最佳掺杂摩尔分数为5%

摩尔分数超过5%后发生猝灭现象。浓度猝灭机理为电多极-电多极的交互作用。LiCaPO

: Eu

是适合UV-LED管芯激发的白光发光二极管用高亮度蓝色发光粉。

Abstract

A novel blue-emitting phosphor LiCaPO

: Eu

for LEDs was prepared by high temperature solid-state reaction and its luminescent properties were investigated. The emission spectrum shows a single intense band centered at 470 nm

which corresponds to the 4f

→4f

transition of Eu

. Comparing with LiSrPO

: Eu

and NaBaPO

: Eu

the emission spectrum shows a red shift obviously. It is caused by the decrease of cationic radii which change the degree of Eu

energy splitting and affect the electron cloud expansion. The excitation spectrum is a broad band extending in 250~440 nm

which matches the emission of ultraviolet light-emitting diodes (UV-LEDs) well. The effect of doped Eu

content on the emission intensity of LiCaPO

: Eu

was also investigated. Different Eu

contents have little effort on the emission spectrum

but the emission intensity shows a great different. The emission intensity is enhanced with the increase of the Eu

content

and the optimal doping content is 5%. Concentration quenching occurs when the Eu

content is beyond 5%

as a result of multipole-multipole interaction. The LiCaPO

: Eu

phosphor is a potential blue-emitting phosphor for white-emitting LEDs.

关键词

Keywords

references

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