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  Journal of Spectroscopy and Dynamics 2011, 1: 1
  Research Article
Effect of plasmonic Au nanoparticles on red 5D0- 7F2 electric dipole emission transition of Eu3+ ions in low phonon antimony based dichroic metallo-dielectric nanocomposites
  Tirtha Som, Basudeb Karmakar  
Glass Science & Technology Section, Glass Division, Central Glass and Ceramic Research Institute (Council of Scientific and Industrial Research (CSIR), India) 196 Raja S. C. Mullick Road, Kolkata 700 032, India
  Eu3+ ions and elliptical Au nanoparticles incorporated new antimony based reducing dielectric (here glass) matrix, K2O-B2O3-Sb2O3 (KBS), has been prepared by a new single-step methodology involving selective thermochemical reduction without employing any external reducing agent. X-ray diffraction (XRD) and selected area electron diffraction (SAED) results of these hybrid nanocomposites indicate that Au0 nanoparticles are grown along the (111) and (200) plane direction. The transmission electron microscopic (TEM) image reveals formation of elliptical Au0 nanoparticles of major axis (diagonal) 5 to 12 nm range. Dichroic behavior is due to elliptical shape of Au0 nanoparticles having aspect ratio of about 1.2. Presence of Au nanoparticles introduces a local crystalline environment and perturbs the local site symmetry around the Eu3+ ions resulting in well-resolved stark splitting of the electric dipole 5D07F2 emission transition into two components (617 and 640 nm). The photoluminescence intensity of the 640 nm red emission of Eu3+ drastically enhances by ~ 8 folds in presence of Au0 nanoparticles and then attenuates with further increase in Au0 concentration. This advocates two types of nano Au0 distribution, clustered and dispersed sites, around the Eu3+ ions. On the contrary, the magnetic dipole 5D07F1 orange (596 nm) transition remain almost unaffected by the presence of nano Au0. Local field enhancement induced by plasmonic Au0 is found to be responsible for the enhancement while reverse energy transfer from Eu3+ ? Au0 and optical re-absorption due to Au0 surface plasmon resonance for attenuation.
  Nano gold; Europium (III); Nanocomposite; Enhanced photoluminescence; Dichroic; Antimony oxide glass  

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