Surface enhanced strong visible photoluminescence from one-dimensional multiferroic BiFeO₃ nanostructures

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• 作者：K. Prashanthi ; G. Thakur ; T. Thundat
• 关键词：Multiferroics ; Nanostructures ; Photoluminescence ; Surface states
• 刊名：Surface Science
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：606
• 期：19-20
• 页码：L83-L86
• 全文大小：610 K

文摘

The surface defect dominated visible emission from one-dimensional multiferroic BiFeO₃ (BFO) nanowires (NWs) is characterized by photoluminescence (PL) spectroscopy. The PL spectra of BFO NWs exhibit a weak near band emission (NBE) along with a strong defect-level emission (DLE). It is suggested that excess surface defects exist in BFO NWs which are responsible for strong visible green emission. Passivation of BFO NW surface with H₂ significantly improves the NBE emission while suppressing surface recombination. Such a surface enhanced emission promises many potential applications of BFO NWs not only in photonic devices such as LEDs but also in fluorescence-based chemical sensing.