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白光LED用新型绿色荧光粉 Ca5(SiO4)2F2 ∶ Eu2+的发光性能
Luminescence Properties of New Ca5(SiO4)2F2 ∶ Eu2+ Green Phosphors for White LEDs
- 发光学报 2011年32卷第3期 页码：256-261
- 作者机构：
1. 五邑大学 功能材料研究所,广东 江门,529020
2. 华南农业大学 理学院生物材料研究所,广东 广州,510642
3. 中山大学 化学与化学工程学院,广东 广州,510275
- 作者简介：
- 基金信息：国家自然科学基金面上基金(20501023)();2009年广东高校优秀青年创新人才培养计划(育苗工程)项目(LYM09031)();华南农业大学211工程重点学科建设
DOI：
中图分类号： O482.31收稿：2010-09-08，
修回：2010-12-7，
网络出版：2011-03-22，
纸质出版：2011-03-22
- 稿件说明：
移动端阅览
丁唯嘉, 张梅, 王静, 苏锵. 白光LED用新型绿色荧光粉 Ca<sub>5</sub>(SiO<sub>4</sub>)<sub>2</sub>F<sub>2</sub> ∶ Eu<sup>2+</sup>的发光性能[J]. 发光学报, 2011,32(3): 256-261
DING Wei-jia, ZHANG Mei, WANG Jing, SU Qiang. Luminescence Properties of New Ca<sub>5</sub>(SiO<sub>4</sub>)<sub>2</sub>F<sub>2</sub> ∶ Eu<sup>2+</sup> Green Phosphors for White LEDs[J]. Chinese Journal of Luminescence, 2011,32(3): 256-261
丁唯嘉, 张梅, 王静, 苏锵. 白光LED用新型绿色荧光粉 Ca<sub>5</sub>(SiO<sub>4</sub>)<sub>2</sub>F<sub>2</sub> ∶ Eu<sup>2+</sup>的发光性能[J]. 发光学报, 2011,32(3): 256-261 DOI：
DING Wei-jia, ZHANG Mei, WANG Jing, SU Qiang. Luminescence Properties of New Ca<sub>5</sub>(SiO<sub>4</sub>)<sub>2</sub>F<sub>2</sub> ∶ Eu<sup>2+</sup> Green Phosphors for White LEDs[J]. Chinese Journal of Luminescence, 2011,32(3): 256-261 DOI：
摘要
采用高温固相法合成出系列绿色Ca
5-
x
Eu
x
(SiO
4
)
2
F
2
荧光粉
并对其发光特性进行了研究。Eu
2+
离子在Ca
5
(SiO
4
)
2
F
2
基质中可被250~440 nm光有效激发发出绿光
适合作为 UV-LED用绿色荧光粉。浓度猝灭实验结果表明
Eu
2+
离子的最佳掺杂摩尔分数为0.15
通过计算推测出Eu
2+
离子在Ca
5-
x
Eu
x
(SiO
4
)
2
F
2
中的能量转移机制应该为偶极-偶极相互作用。温度猝灭特性表明
450 K时的发射强度约为10 K时的35%。不同温度下Eu
2+
离子的荧光寿命结果表明
随着温度的不断升高
荧光寿命不断缩短。
Abstract
A series of new green-emitting phosphors
Eu
2+
-activated Ca
5-
x
Eu
x
(SiO
4
)
2
F
2
were synthesized at 1 223 K by conventional high-temperature solid-state reactions under reductive atmosphere. And the photoluminescence excitation
diffuse reflectance and emission spectra
concentration quenching process
temperature dependence of luminescence and lifetime of phosphors were systematically investigated. The excitation spectrum shows that Ca
5
(SiO
4
)
2
F
2
∶ Eu
2+
can be efficiently excited by the incident lights of 250~440 nm
perfectly matching with the emissions wavelength of near-UV LEDs. The emission intensity is influenced by the Eu
2+
content
and the optimal doping mole fraction is about 0.15. The concentration quenching mechanism was verified as dipole-dipole interaction and the value of the critical transfer distance was calculated as 1.5 nm. The temperature dependent emission spectra in the temperature range of 10~450 K show that the emission intensity at 450 K is 35% of the emission intensity at 10 K. At room temperature
the lifetimes of Eu
2+
ions in Ca
4.85
Eu
0.15
(SiO
4
)
2
F
2
phosphors are determined to be 1.78 s and 7.79 s
respectively. All of these indicate that Ca
5
(SiO
4
)
2
F
2
∶ Eu
2+
is a promising green phosphor candidate for phosphor-converted white LEDs.
关键词
Keywords
references
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