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Grandhe, Bhaskar Kumar,Bandi, Vengala Rao,Jang, Kiwan,Ramaprabhu, S.,Lee, Ho-Sueb,Shin, Dong-Soo,Yi, Soung-Soo,Jeong, Jung-Hyun Elsevier 2012 Composites. Part B, Engineering Vol.43 No.3
<P><B>Abstract</B></P> <P>YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites have been synthesized by means of a modified co-precipitation method (CP-CNT). Multi walled carbon nanotubes (MWCNT’s) have been employed in the synthesis of the YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites to enhance its photoluminescence efficiency. The prepared nanocomposites were thoroughly characterized using the characterization techniques namely XRD, SEM, FTIR and Raman scattering. To evaluate the potentiality of the prepared nanocomposites, the same phosphor has also been prepared by using co-precipitation (CP) method without employing multi walled carbon nanotubes and also by means of conventional solid state reaction method (SSR). The photoluminescence spectra of YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites have shown stronger red emission at 619nm (<SUP>5</SUP>D<SUB>0</SUB> → <SUP>7</SUP>F<SUB>2</SUB>) for both the excitation wavelengths (254 and 393nm) than the other two prepared samples. The effect of MWCNT’s on photoluminescent properties of the YVO<SUB>4</SUB>:Eu<SUP>3+</SUP> nanocomposites is also explained.</P>
Enhanced Red Emission from YVO_4:Eu^(3+) Nano Phosphors Prepared by Simple Co-precipitation Method
Bhaskar Kumar Grandhe,Vengala Rao Bandi,Kiwan Jang,Sundara Ramaprabhu,이성수,Jung-Hyun Jeong 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2
Eu^(3+) doped YVO4 nano phosphors were synthesized by adopting a simple Co-Precipitation Method (CPM). In order to compare and evaluate this method’s potentiality, we prepared the same phosphor by using a conventional Solid State Reaction method (SSR). X-Ray Diffraction (XRD) profile confirms the tetragonal nature of Eu^(3+) doped YVO4 nano phosphors. The efficiency of the prepared phosphors was analyzed by means of its emission spectral profiles. We also observed a rich red emission from the prepared phosphors under a Ultra-Violet (UV) source. Such luminescent powders are expected to be applied as red phosphors in display device applications. In addition, Scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), Fourier-Transform IR spectroscopy (FTIR), and Raman Spectrum were also used to characterize the synthesized phosphor.