Photoluminescence at room temperature in polycrystalline Ba_xSr_1−xTiO₃ ceramics obtained by solid-state reaction method

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• 作者：Wanhui Zhang ; Haiyan Wang ; Jian Chen ; Weihong Zhang ; Xiaomin Xiong ; Jinxiu Zhang
• 关键词：Photoluminescence ; Oxygen vacancies
• 刊名：Journal of Luminescence
• 出版年：2008
• 出版时间：August 2008
• 年：2008
• 卷：128
• 期：8
• 页码：1359-1362
• 全文大小：541 K

文摘

Stoichiometric Ba_xSr_1−xTiO₃ ceramics (x=0.7, 0.8, and 0.9) have been prepared by solid-state reaction method. It has been observed in our experiments that the photoluminescence (PL) spectra in such samples at room temperature were centered around 800 nm; the results have been found to differ from observations in current literature. An explanation of this phenomenon was given, and the origin of such photoluminescence is ascribed to certain defects existing in these compounds, such as oxygen vacancies.