Preparation of Eu-activated strontium orthosilicate (Sr_1.95SiO₄:Eu_0.05) phosphor by a sol–gel method and its luminescent properties

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• 作者：Wei-Hsiang Hsu ; Meng-Huei Sheng ; Ming-Shyong Tsai
• 关键词：Phosphers ; Sol– ; gel synthesis ; Luminescence
• 刊名：Journal of Alloys and Compounds
• 出版年：2009
• 出版时间：7 January 2009
• 年：2009
• 卷：467
• 期：1-2
• 页码：491-495
• 全文大小：847 K

文摘

Eu²⁺-activated Sr₂SiO₄ phosphor was successfully synthesized by a sol–gel method using sodium silicate and SrO as the starting materials. The wavelength of the emission peak and the emission intensity of the phosphor powders were influenced by the pre-treating temperature. The maximum emission intensity of the phosphor was found as pre-treated at 1200 °C in air and then heated at 1300 °C in the reducing atmosphere (10 % H₂ + 90 % He). As the pre-treating temperature was <1200 °C, the composition of the phosphor powder was not uniform, which leads to decrease of the emission intensity, whereas >1200 °C, the decrease of the emission intensity may be caused from the reversible phase transformation of Sr₃SiO₅ → Sr₂SiO₄ at 1300 °C, which also shows the red-shift behavior.