Luminescence Properties of New Ca5(SiO4)2F2 ∶ Eu2+ Green Phosphors for White LEDs

DING Wei-jia; ZHANG Mei; WANG Jing; SU Qiang

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Luminescence Properties of New Ca₅(SiO₄)₂F₂ ∶ Eu²⁺ Green Phosphors for White LEDs

paper | 更新时间：2020-08-12

- Luminescence Properties of New Ca₅(SiO₄)₂F₂ ∶ Eu²⁺ Green Phosphors for White LEDs
- Chinese Journal of Luminescence Vol. 32, Issue 3, Pages: 256-261(2011)
- 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：
- DOI：
  CLC： O482.31
- Received：08 September 2010，
  
  Revised：07 December 2010，
  
  Published Online：22 March 2011，
  
  Published：22 March 2011
- 稿件说明：
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丁唯嘉, 张梅, 王静, 苏锵. 白光LED用新型绿色荧光粉 Ca5(SiO4)2F2 ∶ Eu2+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 Ca5(SiO4)2F2 ∶ Eu2+ 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 Ca5(SiO4)2F2 ∶ Eu2+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 Ca5(SiO4)2F2 ∶ Eu2+ 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

(SiO

)

荧光粉

并对其发光特性进行了研究。Eu

离子在Ca

(SiO

)

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

离子的最佳掺杂摩尔分数为0.15

通过计算推测出Eu

离子在Ca

(SiO

)

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

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

-activated Ca

(SiO

)

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

(SiO

)

∶ Eu

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

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

ions in Ca

4.85

0.15

(SiO

)

phosphors are determined to be 1.78 s and 7.79 s

respectively. All of these indicate that Ca

(SiO

)

∶ Eu

is a promising green phosphor candidate for phosphor-converted white LEDs.

关键词

Keywords

references

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