Luminescent Properties of Ca8Mg(SiO4)4Cl2 : Eu2+ ,Dy2+ Phosphor for White LED

SHEN Chao; SHAO Qi-yue; HAN Xue-lin; DONG Yan; JIANG Jian-qing

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Luminescent Properties of Ca₈Mg(SiO₄)₄Cl₂ : Eu²⁺ ,Dy²⁺ Phosphor for White LED

paper | 更新时间：2020-08-12

- Luminescent Properties of Ca₈Mg(SiO₄)₄Cl₂ : Eu²⁺ ,Dy²⁺ Phosphor for White LED
- Chinese Journal of Luminescence Vol. 31, Issue 1, Pages: 44-48(2010)
- 作者机构：
  
  东南大学材料科学与工程学院江苏省先进金属材料高技术重点实验室, 江苏南京 211189
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：08 June 2009，
  
  Revised：02 January 1900，
  
  Published Online：20 February 2010，
  
  Published：20 February 2010
- 稿件说明：
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SHEN Chao, SHAO Qi-yue, HAN Xue-lin, et al. Luminescent Properties of Ca₈Mg(SiO₄)₄Cl₂ : Eu²⁺ ,Dy²⁺ Phosphor for White LED[J]. Chinese journal of luminescence, 2010, 31(1): 44-48.
DOI：

SHEN Chao, SHAO Qi-yue, HAN Xue-lin, et al. Luminescent Properties of Ca₈Mg(SiO₄)₄Cl₂ : Eu²⁺ ,Dy²⁺ Phosphor for White LED[J]. Chinese journal of luminescence, 2010, 31(1): 44-48. DOI：

摘要

采用高温固相法合成了白光LED用Ca

Mg(SiO

)

: Eu和Ca

Mg(SiO

)

: Eu

Dy绿色发光粉。研究发现:共掺Dy可以明显地提高Ca

Mg(SiO

)

: Eu发光粉的发光性能

表明Dy

和Eu

之间存在着能量传递过程。当Dy

的最佳掺杂摩尔分数为0.02时

发光粉505 nm处绿光发射的强度约提高12%。通过对Dy

和Eu

光谱特性的分析

和Eu

之间的能量传递机制可归因于无辐射交叉弛豫。

Abstract

Calcium magnesium chlorosilicate doped with Eu

can be used as a kind of green phosphor for white-light LED because of its effective excitation under NUV light source and bright green emission. However

according to the current research

the relative brightness of this green phosphor had to be improved. In this paper

calcium magnesium chlorosilicate green phosphors

doped with Eu

or co-doped with Eu

and Dy

were synthesized by high-temperature solid-state reaction in reducing atmosphere. The luminescent properties of these phosphors

as well as the interaction mechanism between Dy

and Eu

were investigated. The significant enhancement of Ca

Mg(SiO

)

∶ Eu

green emission was obtained by co-doping with Dy

and the 505 nm emission intensity of Eu

is increased by 12% with an optimum Dy

content of 0.02. Funthermore

the concentration quenching process was also discovered

and the luminescent intensity of Ca

Mg (SiO

)

∶ Eu

phosphor decreases with further increasing the concentration of Dy

. In this paper

It is suggested to be an energy transfer process between Dy

and Eu

on the basis of spectral characteristics of Dy

and Eu

. On account of the relatively low intensity of Dy

4f-4f emission

the energy transfer could be radiation reabsorption process. On the other hand

the energy transfer mechanism might be ascribed to resonant transfer process

for the radiative lifetime of the 4f-4f forbidden electric-dipole transition of Dy

is much longer than that of the 5d-4f transitions of Eu

. Thus

the most likely energy transfer mechanism between Dy

and Eu

can be attributed to nonradiative cross relaxation process.

关键词

Keywords

references

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