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1. 江西理工大学 冶金与化学工程学院, 江西 赣州 341000
2. 国家离子型稀土资源高效开发利用工程技术研究中心, 江西 赣州 341000
纸质出版日期:2016-10-5,
收稿日期:2016-5-1,
修回日期:2016-5-30,
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叶信宇, 罗洋, 刘松彬等. LiGd(W<sub><em>y</em></sub>Mo<sub>1-<em>y</em></sub>)<sub>2</sub>O<sub>8-<em>x</em>/2</sub>F<sub><em>x</em></sub>:Eu<sup>3+</sup>红色荧光粉的制备和发光特性[J]. 发光学报, 2016,37(10): 1203-1212
YE Xin-yu, LUO Yang, LIU Song-bin etc. Synthesis and Luminescence Properties of LiGd(W<sub><em>y</em></sub>Mo<sub>1-<em>y</em></sub>)<sub>2</sub>O<sub>8-<em>x</em>/2</sub>F<sub><em>x</em></sub>: Eu<sup>3+</sup> Red Phosphors[J]. Chinese Journal of Luminescence, 2016,37(10): 1203-1212
叶信宇, 罗洋, 刘松彬等. LiGd(W<sub><em>y</em></sub>Mo<sub>1-<em>y</em></sub>)<sub>2</sub>O<sub>8-<em>x</em>/2</sub>F<sub><em>x</em></sub>:Eu<sup>3+</sup>红色荧光粉的制备和发光特性[J]. 发光学报, 2016,37(10): 1203-1212 DOI: 10.3788/fgxb20163710.1203.
YE Xin-yu, LUO Yang, LIU Song-bin etc. Synthesis and Luminescence Properties of LiGd(W<sub><em>y</em></sub>Mo<sub>1-<em>y</em></sub>)<sub>2</sub>O<sub>8-<em>x</em>/2</sub>F<sub><em>x</em></sub>: Eu<sup>3+</sup> Red Phosphors[J]. Chinese Journal of Luminescence, 2016,37(10): 1203-1212 DOI: 10.3788/fgxb20163710.1203.
采用高温固相法制备了LiGd(W
y
Mo
1-
y
)
2
O
8-
x
/2
F
x
:0.4Eu
3+
(
x
=0~1,
y
=0~1)系列白光LED用红色荧光粉。通过扫描电子显微镜、X射线衍射仪、红外光谱仪、荧光光谱仪对荧光粉的形貌、结构、光学性能进行了表征。结果表明,Eu
3+
、F
-
和WO
4
2-
的掺杂没有改变LiGd(MoO
4
)
2
的四方晶系白钨矿结构;F
-
和WO
4
2-
最佳掺杂量分别为
x
=0.6,
y
=0.4。在396 nm激发下,LiGd(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
的发光强度比未掺杂样品提高了60%,量子效率可达66.23 %。当温度升高至100 ℃时,样品的发射强度降为25 ℃时的76.6%。在460 nm激发下,样品的最强窄带发射峰位于617 nm处,归属于
5
D
0
7
F
2
跃迁,色坐标为(0.649 9,0.346 3)。
5
D
0
能级的荧光寿命曲线遵循单指数规律衰减,随着F
-
掺杂浓度的增加,
5
D
0
能级的荧光寿命不断增加,归因于低声子能量的F
-
掺入有效减小了能量的无辐射跃迁概率。所制备的LiGd(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
荧光粉有望应用于白光LED。
LiGd(W
y
Mo
1-
y
)
2
O
8-
x
/2
F
x
:0.4Eu
3+
red phosphors with different F
-
and WO
4
2-
doping concentrations for white LEDs were synthesized by the solid state reaction method. Morphology
structure
optical properties of LiGd(W
y
Mo
1-
y
)
2
O
8-
x
/2
F
x
:0.4Eu
3+
phosphors were studied by scanning electron microscope(SEM)
X-ray diffraction (XRD)
Fourier transform infrared spectroscopy (FT-IR) and fluorescence spectrometer. The results show that the samples doped with Eu
3+
F
-
and WO
4
2-
have tetragonal scheelite structure. The optimum doping content of F
-
and WO
4
2-
is
x
=0.6 and
y
=0.4
respectively. Under 396 nm excitation
the maximum emission intensity of LiGd(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
in which the quantum efficiency is 66.23% is higher than 60% in comparison with LiGd(MoO
4
)
2
:0.4Eu
3+
. When the temperature turned up to 100 ℃
the emssion intensity of LiGd(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
is 76.6% of the initial value at 25 ℃. Under 460 nm excitation
intense red emissions corresponding to
5
D
0
7
F
2
transitions of Eu
3+
are observed. The chromaticity coordinates of LiGd(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
phosphors are (0.649 9
0.346 3). Decay curve of
5
D
0
state for as-prepared samples fits the single order exponential behavior
the lifetime of
5
D
0
increases with the increasing of F
-
doping concentration
which is due to the reduction of non-radiative transition probability results from the low phonon energy property of F
-
. LiGd-(W
0.4
Mo
0.6
)
2
O
7.7
F
0.6
:0.4Eu
3+
phosphors are suitable for the white LEDs.
发光红色荧光粉白光LED高温固相法
luminescencered phosphorwhite LEDssolid state reaction
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