科研之友
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摘要
Novel, highly stable Bi2S3 and Bi2-xMnxS3 quantum dots (QDs)-glass optical nanosystems were architectured successfully. These advanced nanosystems were characterized by High Resolution Transmission Electron Microscopy (HRTEM), UV-Vis-NIR spectroscopy and room temperature photoluminescence (PL) measurements. HRTEM of the Bi2S3 QD-glass nanosystem revealed the size of Bi2S3 QDs to be in the range of 5-7 nm. However, for the Bi2-xMnxS3 quantum dots (QDs)-glass nanosystem, the size of Bi2-xMnxS3 QDs were around 3-5 nm. The Bi2S3 quantum dots exhibit an orthorhombic structure with good crystallinity. Bi2-xMnxS3 QDs also exhibit the same structure with lower 'd' values due to Mn2+ incorporation. The optical study clearly reveals the growth of Bi2S3 and Bi2-xMnxS3 QDs in the glass matrix. Interestingly, a blue shift of the transmission edge was observed by incorporation of Mn2+ under the same thermodynamic conditions. Photoluminescence spectra show distinct Bi2S3 and Mn2+ related emissions, which are excited via the Bi2S3 host lattice. The Mn2+ emission intensity at 580 nm wavelength confirms the existence of Mn2+ in the Bi2S3 lattice in the glass matrix. The magneto optical Faraday rotation measurements were performed at room temperature with magnetic fields up to 5.6 mT for all the samples. Significantly, we observed a giant heightening in the Verdet constant i.e. from 159.34 to 507.30 deg T-1 cm(-1) after incorporation of Mn2+ (0 to 0.4 moles), which is much higher than conventional single crystal systems like TGG, BFG (76.82 deg T-1 cm(-1)) as well as other materials reported so far. Our strategy provides a versatile route to controlled magneto optical properties of anisotropic semiconductor nanomaterials, which may create new opportunities for photonic devices, magnetic and current sensor applications.
- 出版日期2013
