DrCHATCHYUTHA RAO | Andhra University (original) (raw)
I am sr.asst prof , working on Luminescence.
Phone: 09949522835
Address: Flat No:201,Brundavanam Apartment,Sriniv
Colony Ist Line,Bapatla-522101,A.P
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Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state r... more Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state reaction technique and is proposed to be one of the potential candidates as a phosphor for use in lamps and field emission displays. There have been many reports on the preparation of Sr2CeO4 by various chemical methods in recent past. Here we report the effect of flux on sr2ceo4:Gd 3+ (0.5mol %) phosphor prepared by solid state reaction method. Xray powder diffraction confirms the formation of pure Sr2CeO4 phase crystallizing in orthorhombic structure after annealing at 1200°C for 12 hrs without any trace of impurities. The crystallite size calculated by using Scherrer’s formula revealed the presence of formation of nano crystallites. Scanning Electron Microscope (SEM) images showed that the sample fired at 1200C exhibits grain like morphology with different sizes and shape. Fourier Transform Infrared Spectroscopy (FTIR) determined the chemical bonds in a molecule and the particle size d...
Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state r... more Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state reaction technique and is proposed to be one of the potential candidates as a phosphor for use in lamps and field emission displays. There have been many reports on the preparation of Sr2CeO4 by various chemical methods in recent past. Here we report the effect of flux on sr2ceo4:Gd 3+ (0.5mol %) phosphor prepared by solid state reaction method. Xray powder diffraction confirms the formation of pure Sr2CeO4 phase crystallizing in orthorhombic structure after annealing at 1200°C for 12 hrs without any trace of impurities. The crystallite size calculated by using Scherrer's formula revealed the presence of formation of nano crystallites. Scanning Electron Microscope (SEM) images showed that the sample fired at 1200 0 C exhibits grain like morphology with different sizes and shape. Fourier Transform Infrared Spectroscopy (FTIR) determined the chemical bonds in a molecule and the particle size distribution histogram indicated the mean diameter of sample.Commission international de l'eclairage (CIE) coordinates of samples revealed that the emission of blue colour. The photo luminescence spectra confirmed the formation of Gd 3+ (0.5mol %) doped Sr2CeO4 phosphor with maximum emission intensity for sample prepared at 1200 0 C at 470 nm. The present work shows that the phosphor can be prepared at relatively higher temperatures and can be used for many display applications.
Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state r... more Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state reaction technique and is proposed to be one of the potential candidates as a phosphor for use in lamps and field emission displays. There have been many reports on the preparation of Sr2CeO4 by various chemical methods in recent past. Here we report the effect of flux on sr2ceo4:Gd 3+ (0.5mol %) phosphor prepared by solid state reaction method. Xray powder diffraction confirms the formation of pure Sr2CeO4 phase crystallizing in orthorhombic structure after annealing at 1200°C for 12 hrs without any trace of impurities. The crystallite size calculated by using Scherrer’s formula revealed the presence of formation of nano crystallites. Scanning Electron Microscope (SEM) images showed that the sample fired at 1200C exhibits grain like morphology with different sizes and shape. Fourier Transform Infrared Spectroscopy (FTIR) determined the chemical bonds in a molecule and the particle size d...
Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state r... more Sr2CeO4 is a blue white phosphor which has been recently identified by conventional solid state reaction technique and is proposed to be one of the potential candidates as a phosphor for use in lamps and field emission displays. There have been many reports on the preparation of Sr2CeO4 by various chemical methods in recent past. Here we report the effect of flux on sr2ceo4:Gd 3+ (0.5mol %) phosphor prepared by solid state reaction method. Xray powder diffraction confirms the formation of pure Sr2CeO4 phase crystallizing in orthorhombic structure after annealing at 1200°C for 12 hrs without any trace of impurities. The crystallite size calculated by using Scherrer's formula revealed the presence of formation of nano crystallites. Scanning Electron Microscope (SEM) images showed that the sample fired at 1200 0 C exhibits grain like morphology with different sizes and shape. Fourier Transform Infrared Spectroscopy (FTIR) determined the chemical bonds in a molecule and the particle size distribution histogram indicated the mean diameter of sample.Commission international de l'eclairage (CIE) coordinates of samples revealed that the emission of blue colour. The photo luminescence spectra confirmed the formation of Gd 3+ (0.5mol %) doped Sr2CeO4 phosphor with maximum emission intensity for sample prepared at 1200 0 C at 470 nm. The present work shows that the phosphor can be prepared at relatively higher temperatures and can be used for many display applications.