Enhanced photoluminescence of CaTiO₃:Pr³⁺ phosphor films deposited on SiO₂ buffered Si substrates

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• 作者：Wei Wang ; Mingrong Shen ; Yun Li ; Liang Fang ; Fengang Zheng ; Xinglong Wu
• 关键词：CaTiO₃ ; Pr³⁺ ; Photoluminescence ; Crystallinity
• 刊名：Thin Solid Films
• 出版年：2009
• 出版时间：2 April 2009
• 年：2009
• 卷：517
• 期：11
• 页码：3398-3401
• 全文大小：505 K

文摘

CaTiO₃:Pr³⁺ films have been prepared by pulsed-laser deposition method on SiO₂-buffered Si substrates, and their microstructure and photoluminescence properties have been compared with those of the films deposited directly on bare Si substrates. The SiO₂ buffer layers were prepared using thermal oxidization and HF-etching. Photoluminescence intensities of CaTiO₃:Pr³⁺ films on the SiO₂-buffered Si substrates are significantly higher (up to 800 % ) than those of the films on bare Si substrates, which is attributed to the low refractive index and low light absorption of the SiO₂ buffer layer. This study reveals that the presence of the buffer layer is effective in improving the red emission brightness of CaTiO₃:Pr³⁺ films without sacrificing the surface roughness.