Effect of Ca2+ Doping on Luminescence Properties of BaMgSiO4 ∶ Eu2+ Phosphor

YANG Chuang-tao; CHEN Qing-qing; MENG Jian-xin; LIU Ying-liang

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Effect of Ca²⁺ Doping on Luminescence Properties of BaMgSiO₄ ∶ Eu²⁺ Phosphor

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- Effect of Ca²⁺ Doping on Luminescence Properties of BaMgSiO₄ ∶ Eu²⁺ Phosphor
- Chinese Journal of Luminescence Vol. 31, Issue 3, Pages: 316-320(2010)
- 作者机构：
  
  1. 暨南大学纳米化学研究所,广东广州,510632
  2. 暨南大学化学系,广东广州,510632
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：04 June 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 June 2010，
  
  Published：30 June 2010
- 稿件说明：
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杨创涛;陈清清;孟建新;刘应亮. Ca2+掺杂对BaMgSiO4 ∶ Eu2+发光材料发光性能的影响[J]. 发光学报, 2010,31(3): 316-320

YANG Chuang-tao;CHEN Qing-qing;MENG Jian-xin;LIU Ying-liang. Effect of Ca2+ Doping on Luminescence Properties of BaMgSiO4 ∶ Eu2+ Phosphor[J]. 发光学报, 2010,31(3): 316-320
杨创涛;陈清清;孟建新;刘应亮. Ca2+掺杂对BaMgSiO4 ∶ Eu2+发光材料发光性能的影响[J]. 发光学报, 2010,31(3): 316-320 DOI：

YANG Chuang-tao;CHEN Qing-qing;MENG Jian-xin;LIU Ying-liang. Effect of Ca2+ Doping on Luminescence Properties of BaMgSiO4 ∶ Eu2+ Phosphor[J]. 发光学报, 2010,31(3): 316-320 DOI：

摘要

采用高温固相法于弱还原气氛中制备了Ba

MgSiO

∶ Eu

(

0.15)发光材料

测量其光谱特性

分析Ca

掺杂对该发光材料光谱的影响。XRD图谱研究表明:Ca

在BaMgSiO

基质中极限溶解度

=0.075。发光性能研究表明

当Ca

掺入量从0增加至0.05时

最强发射峰从498 nm蓝移至450 nm

在掺入量为0.075时

激发和发射强度达到最强

而随着Ca

掺入量的增加激发光谱的形状也发生变化。从Ca

取代不同点阵位的Ba

并结合晶体场强度的变化讨论了光谱变化的原因。

Abstract

The Eu

-doped silicate based phosphors are very suitable for LEDs. These phosphors show broad emission colors which may vary from near UV to red light through 4f-5d transition of Eu

activator and strongly depend on the host lattice

thus the emission wavelength is tunable by modifying the composition and structure of the hosts. This provides a possible way to fabricate color-tunable phosphors for LEDs.In this article

a new composition of color-tunable phosphor material Ba

xMgSiO

: Eu

doped with Ca

(

0.15)was synthesized by conventional solid-state reaction in a reductive atmosphere(95%N

+5%H

)

their luminescent properties and the influence of Ca

content were investigated by X-ray diffraction(XRD) and fluorescence spectrometer. The results showed that the emission of the phosphors turns from 498 to 450 nm

when the content of Ca

increases in 0~0.05.The maximum emission and excitation intensity are reached when the content of Ca

is equals to 0.075

and the shape of the excitation spectra also changes as increasing the content of Ca

. The XRD curves show that the single phase limit of Ca

in the phosphors is below 0.075.The results can be explained by Ca

substitution for Ba

in different lattice sites and the crystal field strength. As reported by Mingying Peng

et al

in the structure of BaMgSiO

there are three different barium sites Ba(1)

Ba(2) and Ba(3) with equal amounts in the lattice. The 498 nm emission band corresponds to the Eu

emission on the Ba(1) and Ba(2) sites. And the two absorption bands at 360 and 400 nm in the excitation spectrum are assigned to the Eu

centers on Ba(1) and Ba(2) sites

respectively. The Ba

at the Ba(2) can be more easily substituted by Ca

because of a longer average Ba-O distances . The strength of crystal field around the Eu

ion on Ba(1) sites changes when Ca

substitutes the Ba

at Ba(2)

which leads to the change of excitation and emission spectra of the Eu

ion on Ba(1) sites. Then

when the content of Ca

is over 0.075

at Ba(2) reaches saturation

and the CaMgSiO

phase occurs. This leads to impurity quenching. Ca

substitution for Ba

at Ba(1) also causes the change of the excitation spectrum.

关键词

Keywords

references

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