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1. 南昌大学 材料科学与工程学院, 江西 南昌 330001
2. 南昌大学 江西省轻质高强结构材料重点实验室, 江西 南昌 330001
收稿日期:2018-12-27,
修回日期:2019-02-27,
网络出版日期:2019-03-14,
纸质出版日期:2019-09-05
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汪雨, 罗岚, 郭锐等. (Mg<sub>1-<em>x</em></sub>Sr<sub><em>x</em></sub>)<sub>2</sub>SiO<sub>4</sub>:(Eu<sup>3+</sup>,F<sup>-</sup>)荧光粉的物相及光谱[J]. 发光学报, 2019,40(9): 1086-1095
WANG Yu, LUO Lan, GUO Rui etc. Phase Constitutions and Luminescent Spectra of(Mg<sub>1-<em>x</em></sub>Sr<sub><em>x</em></sub>)<sub>2</sub>SiO<sub>4</sub>: (Eu<sup>3+</sup>,F<sup>-</sup>) Phosphors[J]. Chinese Journal of Luminescence, 2019,40(9): 1086-1095
汪雨, 罗岚, 郭锐等. (Mg<sub>1-<em>x</em></sub>Sr<sub><em>x</em></sub>)<sub>2</sub>SiO<sub>4</sub>:(Eu<sup>3+</sup>,F<sup>-</sup>)荧光粉的物相及光谱[J]. 发光学报, 2019,40(9): 1086-1095 DOI: 10.3788/fgxb20194009.1086.
WANG Yu, LUO Lan, GUO Rui etc. Phase Constitutions and Luminescent Spectra of(Mg<sub>1-<em>x</em></sub>Sr<sub><em>x</em></sub>)<sub>2</sub>SiO<sub>4</sub>: (Eu<sup>3+</sup>,F<sup>-</sup>) Phosphors[J]. Chinese Journal of Luminescence, 2019,40(9): 1086-1095 DOI: 10.3788/fgxb20194009.1086.
采用高温固相法在空气氛围下在1 150℃制备(Mg
1-
x
Sr
x
)
2
SiO
4
(
x
=0~1)粉末。物相分析表明,随着Sr离子含量由小到大,(Mg
1-
x
Sr
x
)
2
SiO
4
基质晶相组成将发生如下变化:-Mg
2
SiO
4
、-Mg
2
SiO
4
混合相(
x
=0)-Sr
2
SiO
4
、-Sr
2
SiO
4
、-Mg
2
SiO
4
、-Mg
2
SiO
4
、Sr
3
MgSi
2
O
8
混合相(0.2
x
0.8)-Sr
2
SiO
4
和-Sr
2
SiO
4
混合相(
x
=1);当
x
=0.2时主晶相为高温-Mg
2
SiO
4
,而在
x
=0时主晶相为低温-Mg
2
SiO
4
。紫外发光照相和光谱表明,当
x
=0.2时,(Mg
1-
x
Sr
x
)
1.96
SiO
4
:0.04(Eu
3+
,F
-
)红光发射亮度最大。进一步晶体结构分析发现Sr离子可以固溶入-Mg
2
SiO
4
使得-Mg
2
SiO
4
更为稳定,同时晶格略微增大;化学配比为(Mg
0.8
Sr
0.2
)
2
SiO
4
粉末在1 250℃煅烧可以得到平均粒径为21.68 m的单相-Mg
2
SiO
4
粉末。对于单相(Mg
0.8
Sr
0.2
)
2-
y
SiO
4
:
y
(Eu
3+
,F
-
)系列荧光粉,其XPS分析表明Eu离子以三价进入晶格;光谱分析表明在365 nm和254 nm激发下,有595,615(主峰),655,705 nm红光锐峰发射(对应
5
D
0
7
F
n
,
n
=1,2,3,4);且
y
=0.04为最佳铕离子掺杂浓度(此时其量子效率、寿命均达到最大);基于Blasse理论可判断铕离子间能量传递方式为基于辐射跃迁的电四极-电四极作用。
(Mg
1-
x
Sr
x
)
2-
y
SiO
4
(
x
=0~1) powder was prepared at 1 150℃ by high temperature solid-state method. As Sr ion content in matrix increasing
the phase constitutions change from -Mg
2
SiO
4
-Mg
2
SiO
4
mixture(
x
=0) to -Sr
2
SiO
4
-Sr
2
SiO
4
-Mg
2
SiO
4
-Mg
2
SiO
4
Sr
3
MgSi
2
O
8
mixture(0.2
x
0.8)
then to -Sr
2
SiO
4
-Sr
2
SiO
4
mixture(
x
=1). Furthermore
when
x
=0.2
the main phase is -Mg
2
SiO
4
while
x
=0
the main phase is -Mg
2
SiO
4
. UV light excitation and luminescent spectra analysis show (Mg
0.8
Sr
0.2
)
1.96
SiO
4
:0.04(Eu
3+
F
-
) has been picked out as the best red phosphor composition among (Mg
1-
x
Sr
x
)
1.96
SiO
4
:0.04(Eu
3+
F
-
). Sr ion would go into -Mg
2
SiO
4
crystal lattice
and makes the phase more stable. When the annealing temperature reaching at 1 250℃
the powder has the composition as (Mg
0.8
Sr
0.2
)
2
SiO
4
would be single phase as -Mg
2
SiO
4
. (Mg
0.8
Sr
0.2
)
2-
y
SiO
4
:
y
(Eu
3+
F
-
) series(~21.68 m) have red-band emission peaks at 595
615(main)
655
705 nm(related to
5
D
0
7
F
n
n
=1
2
3
4) under 365 nm or 254 nm excitation
and the most suitable Eu
3+
doping amount is 4%(the quantum yields and lifetime both reaching to maxium value among the series). Based on Blasse theory
the main energy transfer mode for activators should be the four electric dipoles(q-q).
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