Nd³⁺-doped perovskite nanosheets with NIR luminescence

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• 作者：Asami Funatsu ; Takaaki Taniguchi ; Yousuke Tokita ; Tomoaki Murakami ; Yuki Nojiri ; Yasumichi Matsumoto
• 关键词：Nanosheet ; Near-infrared ; Luminescence ; Perovskite ; Nanocomposites
• 刊名：Materials Letters
• 出版年：1 January, 2014
• 年：2014
• 卷：114
• 期：Complete
• 页码：29-33
• 全文大小：2419 K

文摘

Exfoliation of layered materials into ultrathin nanosheets introduces a new cost-effective and environmentally safe fabrication method for novel nanostructured devices. In the present study, we have developed for the first time inorganic oxide nanosheets with near-infrared (NIR) luminescence properties. KLa_1鈭?em>xNd_xNb₂O₇ (x=0.025, 0.05, 0.1, 0.2, or 0.3) powders obtained by a solid state reaction were exfoliated into single-layer metal oxide nanosheets with approximately 1.7 nm thickness by osmotic swelling with tetrabutylammonium cations, followed by the protonation of KLa_1鈭?em>xNd_xNb₂O₇. We observed strong coupling of high-energy OH vibration with the Nd³⁺ energy levels upon protonation and exfoliation steps because of the extremely thin nature of oxide nanosheet-layers. Colloidal oxide nanosheets with an optimized Nd-doping concentration yielded detectable NIR luminescence due to ⁴F_3/2-⁴I_11/2 (Nd³⁺) radiative transitions, which opens possible application of these oxide nanosheets as bioimaging probes and bioanalytical sensors.