中国物理B ›› 2009, Vol. 18 ›› Issue (5): 2068-2071.doi: 10.1088/1674-1056/18/5/057

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Luminescence characteristics of Eu2+ activated Ca2SiO4, Sr2SiO4 and Ba2SiO4 phosphors for white LEDs

王志军, 杨志平, 郭庆林, 李盼来, 傅广生   

  1. College of Physics Science & Technology, Hebei University, Baoding 071002, China
  • 收稿日期:2008-12-01 修回日期:2008-12-18 出版日期:2009-05-20 发布日期:2009-05-20
  • 基金资助:
    Project supported by Hebei Provincial Technology Development Foundation of China (Grant No 51215103b), and Science Foundation of Hebei University of China (Grant No 2006Q06).

Luminescence characteristics of Eu2+ activated Ca2SiO4 Sr2SiO4 and Ba2SiO4 phosphorsfor white LEDs

Wang Zhi-Jun(王志军)†, Yang Zhi-Ping(杨志平), Guo Qing-Lin(郭庆林), Li Pan-Lai(李盼来), and Fu Guang-Sheng(傅广生)   

  1. College of Physics Science & Technology, Hebei University, Baoding 071002, China
  • Received:2008-12-01 Revised:2008-12-18 Online:2009-05-20 Published:2009-05-20
  • Supported by:
    Project supported by Hebei Provincial Technology Development Foundation of China (Grant No 51215103b), and Science Foundation of Hebei University of China (Grant No 2006Q06).

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摘要： This paper investigates the luminescence characteristics of Eu2+ activated Ca2SiO4, Sr2SiO4 and Ba2SiO4 phosphors. Two emission bands are assigned to the f--d transitions of Eu2+ ions doped into two different cation sites in host lattices, and show different emission colour variation caused by substituting M2+ cations for smaller cations. This behaviour is discussed in terms of two competing factors of the crystal field strength and covalence. These phosphors with maximum excitation of around 370nm can be applied as a colour-tunable phosphor for light-emitting diodes (LEDs) based on ultraviolet chip/phosphor technology.

关键词: luminescence, white LEDs, Eu*

Abstract: This paper investigates the luminescence characteristics of Eu2+ activated Ca2SiO4, Sr2SiO4 and Ba2SiO4 phosphors. Two emission bands are assigned to the f--d transitions of Eu2+ ions doped into two different cation sites in host lattices, and show different emission colour variation caused by substituting M2+ cations for smaller cations. This behaviour is discussed in terms of two competing factors of the crystal field strength and covalence. These phosphors with maximum excitation of around 370nm can be applied as a colour-tunable phosphor for light-emitting diodes (LEDs) based on ultraviolet chip/phosphor technology.

Key words: luminescence, white LEDs, Eu2+, silicate

中图分类号:  (Other solid inorganic materials)

  • 78.55.Hx
85.60.Jb (Light-emitting devices)