Enhanced red fluorescence in Sr₂Si_{1鈭?span style='font-style: italic'>x}Ge_xO₄:Eu³⁺ phosphors by the substitution of Si by Ge for white light emitting diodes

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• 作者：Lihui Huang ; Shiqing Xu ; ^{sxucjlu@hotmail.com} ; Meiquan Guo ; Chenyue Wang ; Youjie Hua ; Shilong Zhao ; Degang Deng ; Huanping Wang ; Guohua Jia
• 关键词：A. Optical materials ; D. Luminescence ; D. Optical properties
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2012
• 期刊代码：69_00223697
• 类别：ch
• 出版时间：July, 2012
• 卷：73
• 期：7
• 页码：886-889
• 文件大小：633 K

摘要

Eu³⁺-doped Sr₂Si_1鈭?em>xGe_xO₄ (x=0-1) phosphors have been prepared by the high temperature solid-state reaction method. The luminescent properties of these phosphors were investigated. Red fluorescence of Eu³⁺ is enhanced gradually in the samples with increasing substitution of Si by Ge upon the excitation of 393 nm light. The intensity is increased by 50%with full substitution of Si by Ge. These results are originated from the structural changes and the phonon energy reduction in the samples due to the substitution of Si by Ge. The CIE chromaticity coordinates of the phosphors vary slightly around (0.62, 0.37) and all are in the red color region. The results indicate that these phosphors could be promising red phosphors for white light emitting diodes.