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Ca2MgSi2O7 :Eu2+绿色发光粉的低温合成及光致发光
Preparation and Photoluminescence of Ca2MgSi2O7 : Eu2+ Phosphor Powder
- 发光学报 2010年31卷第1期 页码：54-58
- 作者机构：
1. 南昌大学 材料科学与工程学院,江西 南昌,330031
2. 南昌大学 分析测试中心,江西 南昌,330029
- 作者简介：
- 基金信息：
DOI：
中图分类号： O482.31收稿日期：2009-05-26，
修回日期：1900-01-02，
网络出版日期：2010-02-20，
纸质出版日期：2010-02-20
- 稿件说明：
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章少华;胡江峰;周明斌;王建军;谢 冰. Ca<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> :Eu<sup>2+</sup>绿色发光粉的低温合成及光致发光[J]. 发光学报, 2010,31(1): 54-58
ZHANG Shao-hua;HU Jiang-feng;ZHOU Ming-bin;WANG Jian-jun;XIE Bing. Preparation and Photoluminescence of Ca<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> : Eu<sup>2+</sup> Phosphor Powder[J]. 发光学报, 2010,31(1): 54-58
章少华;胡江峰;周明斌;王建军;谢 冰. Ca<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> :Eu<sup>2+</sup>绿色发光粉的低温合成及光致发光[J]. 发光学报, 2010,31(1): 54-58 DOI：
ZHANG Shao-hua;HU Jiang-feng;ZHOU Ming-bin;WANG Jian-jun;XIE Bing. Preparation and Photoluminescence of Ca<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> : Eu<sup>2+</sup> Phosphor Powder[J]. 发光学报, 2010,31(1): 54-58 DOI：
摘要
采用CaCl
2
作助熔剂同时又作反应物
利用固相法在碳还原气氛下合成了Ca
2
MgSi
2
O
7
: Eu
2+
发光粉
确定其最佳的合成条件为按CaCO
3
、Mg(OH)
2
、SiO
2
、CaCl
2
的量的比1.5 : 1 : 2 : 2.4称取原料
烧结温度为900 ℃
烧结时间为3 h。合成的样品可被360~480 nm的光有效激发
得到发射峰值位于529 nm的绿光。该发光粉Eu
2+
的最佳掺杂摩尔分数为0.02。与高温法相比
低温法制备的Ca
2
MgSi
2
O
7
: Eu
2+
发光粉激发光谱形状表现出一些差别
并且发射光强度显著增强
低温制备的Ca
2
MgSi
2
O
7
: 0.02Eu
2+
的发射强度是高温制备样品的261%。
Abstract
Alkaline earth silicate Ca
2
MgSi
2
O
7
: Eu
2+
phosphors were prepared under a reducing atmosphere by solid-state reaction using CaCl
2
as flux medium and starting materials. Samples sintered under different CaCO
3
concentration
different temperatures and different time were obtained. The effect of these conditions on the structure was studied by X-ray diffraction (XRD). The synthetic conditions were optimized at the molar ratio of starting materials CaCO
3
: Mg(OH)
2
: SiO
2
: CaCl
2
equal to 1.5 : 1 : 2 : 2.4
sintering temperature 900 ℃ and sintering time 3 h. The photoluminescence (PL) spectra of the as-prepared phosphor powders were measured. The results indicated that the Ca
2
MgSi
2
O
7
: Eu
2+
phosphor can be effectively excited by the light in the wavelength range of 360~480 nm and emission spectrum shows a broad green emission band centered at 529 nm with a bright green emission. And it is possible to determine the distribution of this broad emission band in the spectrum associated with transition from the 4f5d level of Eu
2+
ion which only replaces the Ca
2+
ion site with a coordinate number of eight. Furthermore
the broad green emission band is asymmetric as a result of the re-absorption of the blue light by the green-emission light. The Ca
2
MgSi
2
O
7
∶ Eu
2+
phosphors were also synthesized at 1 200 ℃ for 4 h in a reducing atmosphere using H
3
BO
3
as flux medium and CaCO
3
Mg(OH)
2
SiO
2
as starting materials. Comparing the high temperature and low temperature methods
we found that their exitaton spectrum profiles are different
and the emission intensity of Ca
2
MgSi
2
O
7
∶
x
Eu
2+
(
x
=0.01
0.02
0.03
0.04
0.07) phosphor prepared at 900 ℃ is higher than that of powders prepared at 1 200 ℃.
关键词
Keywords
references
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