Optical Properties of Sr1-yEuySi2O2-zN2+2z/3 Phosphors and Their Applications in White LED

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

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Optical Properties of Sr_1-yEu_ySi₂O_2-zN_2+2z/3 Phosphors and Their Applications in White LED

paper | 更新时间：2020-08-12

- Optical Properties of Sr_1-yEu_ySi₂O_2-zN_2+2z/3 Phosphors and Their Applications in White LED
- Chinese Journal of Luminescence Vol. 31, Issue 1, Pages: 31-38(2010)
- 作者机构：
  
  1. 五邑大学功能材料研究所,广东江门,529020
  2. 中山大学化学与化学工程学院,广东广州,510275
  3. 华南农业大学理学院,广东广州,510642
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：01 April 2009，
  
  Revised：02 January 1900，
  
  Published Online：20 February 2010，
  
  Published：20 February 2010
- 稿件说明：
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ZHANG Mei, DING Wei-jia, WANG Jing, et al. Optical Properties of Sr_1-yEu_ySi₂O_2-zN_2+2z/3 Phosphors and Their Applications in White LED[J]. Chinese journal of luminescence, 2010, 31(1): 31-38.
DOI：

ZHANG Mei, DING Wei-jia, WANG Jing, et al. Optical Properties of Sr_1-yEu_ySi₂O_2-zN_2+2z/3 Phosphors and Their Applications in White LED[J]. Chinese journal of luminescence, 2010, 31(1): 31-38. DOI：

摘要

采用高温固相法合成出系列黄绿色Sr

1-y

2-z

2+2z/3

荧光材料

进行了光学性质表征并探索了其在LED上的应用。在Eu

掺杂浓度为0~0.200范围内

所合成的化合物为系列色坐标可调的黄绿光-黄光连续固溶体

在250~500 nm具有高的激发效率

激发和发射光谱位置及其发射强度随Eu

浓度改变产生规律性变化;利用光谱理论系统研究了Eu

的最低5d吸收能级、5d轨道重心移动、晶体场分裂和Stokes位移对激发和发射光谱位置、半峰全宽和荧光寿命的影响及其相互关系。该类荧光材料在77~425 K具有良好的温度特性

425 K时的发射强度为77 K的58%左右。首次将它们和近紫外LED(~400 nm)、蓝光LED(~460 nm)封装成高亮度黄绿光和黄光LED以及白光LED

发光效率高达19 lm/W

这些封装的LED的发光性能也随着Eu

浓度

以及粉胶比例变化而呈规律性变化。

Abstract

A series of Sr

1-y

2-z

2+2z/3

phosphors were synthesized by the high-temperature solid-state reaction and characterized systematically.The X-ray powder diffraction analysis confirms the formation of a solid solution of Sr

1-y

2-z

2+2z/3

phosphor for Eu concentration from 0 to 0.2. The photoluminescence properties show that the phosphors can be efficiently excited by UV-visible light from 250 to 500 nm and exhibit intense tunable yellowish green light due to Eu concentration. The relationship among the lowest 5d absorption bands

Stocks shifts

the centroid shifts and splitting of Eu

levels was studied in details. The temperature dependent emission spectra in the temperature range of 77~450 K show that they have a high thermal quenching temperature above 450 K. The LED based on UV/blue chip and Sr

1-y

2-z

2+2z/3

phosphors were encapsulated firstly

which show intense green

white and lower UV light emission. Their luminescent properties agree well with these phosphors. The luminous efficiency of the fabricated LED can reach 19 lm/W and the white LED can be obtained from the phosphors fabricated with blue chip based on different gel concentration. These results indicate that Sr

1-y

2-z

2+2z/3

phosphors are promising candidates for solid-state lighting LED.

关键词

Keywords

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