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Ca2+掺杂对BaMgSiO4 ∶ Eu2+发光材料发光性能的影响
Effect of Ca2+ Doping on Luminescence Properties of BaMgSiO4 ∶ Eu2+ Phosphor
- 发光学报 2010年31卷第3期 页码：316-320
- 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：
中图分类号： O482.31收稿日期：2009-06-04，
修回日期：1900-01-02，
网络出版日期：2010-06-30，
纸质出版日期：2010-06-30
- 稿件说明：
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杨创涛;陈清清;孟建新;刘应亮. Ca<sup>2+</sup>掺杂对BaMgSiO<sub>4</sub> ∶ Eu<sup>2+</sup>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 Ca<sup>2+</sup> Doping on Luminescence Properties of BaMgSiO<sub>4</sub> ∶ Eu<sup>2+</sup> Phosphor[J]. 发光学报, 2010,31(3): 316-320
杨创涛;陈清清;孟建新;刘应亮. Ca<sup>2+</sup>掺杂对BaMgSiO<sub>4</sub> ∶ Eu<sup>2+</sup>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 Ca<sup>2+</sup> Doping on Luminescence Properties of BaMgSiO<sub>4</sub> ∶ Eu<sup>2+</sup> 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
1-
x
Ca
x
MgSiO
4
∶ Eu
2+
(
x
0.15)发光材料
测量其光谱特性
分析Ca
2+
掺杂对该发光材料光谱的影响。XRD图谱研究表明:Ca
2+
在BaMgSiO
4
基质中极限溶解度
x
=0.075。发光性能研究表明
当Ca
2+
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
2+
掺入量的增加激发光谱的形状也发生变化。从Ca
2+
取代不同点阵位的Ba
2+
并结合晶体场强度的变化讨论了光谱变化的原因。
Abstract
The Eu
2+
-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
2+
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
1-
x
Ca
<
em
>
xMgSiO
4
: Eu
2+
doped with Ca
2+
(
x
0.15)was synthesized by conventional solid-state reaction in a reductive atmosphere(95%N
2
+5%H
2
)
their luminescent properties and the influence of Ca
2+
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
2+
increases in 0~0.05.The maximum emission and excitation intensity are reached when the content of Ca
2+
is equals to 0.075
and the shape of the excitation spectra also changes as increasing the content of Ca
2+
. The XRD curves show that the single phase limit of Ca
2+
in the phosphors is below 0.075.The results can be explained by Ca
2+
substitution for Ba
2+
in different lattice sites and the crystal field strength. As reported by Mingying Peng
et al
in the structure of BaMgSiO
4
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
2+
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
2+
centers on Ba(1) and Ba(2) sites
respectively. The Ba
2+
at the Ba(2) can be more easily substituted by Ca
2+
because of a longer average Ba-O distances . The strength of crystal field around the Eu
2+
ion on Ba(1) sites changes when Ca
2+
substitutes the Ba
2+
at Ba(2)
which leads to the change of excitation and emission spectra of the Eu
2+
ion on Ba(1) sites. Then
when the content of Ca
2+
is over 0.075
Ca
2+
at Ba(2) reaches saturation
and the CaMgSiO
4
phase occurs. This leads to impurity quenching. Ca
2+
substitution for Ba
2+
at Ba(1) also causes the change of the excitation spectrum.
关键词
Keywords
references
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