Effect of Er substituting sites on upconversion luminescence of Er³⁺-doped BaTiO₃ films

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• 作者：Lei CHEN ; Xian-hua WEI ; ^{weisansao@yahoo.com.cn} ; Xu FU
• 关键词：Er3+ doping ; BaTiO3 thin films ; upconversion photoluminescence ; sol-gel method
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1156-1160
• 文件大小：372 K

摘要

Erbium-doped BaTiO₃ films on LaNiO₃/Si substrates were fabricated by sol-gel method. The crystalline structure, morphologies and upconversion (UC) luminescence properties of films were respectively investigated by X-ray diffraction (XRD), atomic force microcopy (AFM) and photoluminescence (PL). The results indicate that both of the microstructure and luminescence are found to be dependent on Er³⁺ substituting sites. The samples with A-site substitution have smaller lattice constants, larger grains and smoother surface than those with B-site substitution. The photoluminescence spectra show that both of the samples have two stronger green emission bands centered at 528 and 548 nm and a weak red emission band centered at 673 nm, which correspond to the relaxation of Er³⁺ from ²<em>Hem>_11/2,⁴<em>Sem>_3/2, and ⁴<em>Fem>_9/2 levels to the ground level ⁴<em>Iem>_15/2, respectively. Compared with B-site doped films, A-site doped films have a stronger integrated intensity of green emissions and a weaker relative intensity of red emissions. The differences could be explained by the crystalline quality and cross relaxation (CR) process.