Vikas Dubey

Down conversion luminescence behavior of Er and Yb doped Y2O3 phosphor

Abstract We have studied downconversion luminescence behaviour of Y2O3 phosphor doped with Er 1mol% and 1mol% of Yb. The sample was prepared by modified solid state reaction method. Using inorganic material like (Y2O3), Flux Calcium Fluoride (CaF2) and Er2O3 as well as Yb2O3 with molar ratio 1mol% of dopant. The prepared phosphor sample was characterized using Powder X-Ray Diffraction (PXRD), Field Emission Gun Scanning Electron Microscopy (FEGSEM), High Resolution Transmission Electron Microscopy (HRTEM), Photoluminescence (PL), Thermoluminescence (TL) and CIE techniques. The obtained sample shows an intense greenish-white emission (ranging from 350 to 600nm, centered at 565nm) under a wide range of UV light excitation (220–400nm).

Effect of variable cerium concentration on photoluminescence behaviour in ZrO2 phosphor synthesized by combustion synthesis method

Present paper reports synthesis and characterization of trivalent cerium (Ce3+) doped zirconium dioxide (ZrO2) phosphors. Effect of variable concentration of cerium on photoluminescence (PL) is studied. Samples were prepared by combustion synthesis technique which is suitable for less time taking techniques also for large scale production for phosphors. Starting material used for sample preparation are Zr(NO3)3 and Ce(NO3)3 and urea used as a fuel. All prepared phosphor with variable concentration of Ce3+ (0.1 to 2mol%) was studied by photoluminescence analysis it is found that the excitation spectra of prepared phosphor shows broad excitation centred at 390nm. The excitation spectra with variable concentration of Ce3+ show strong peaks at 447nm. Spectrophotometric determinations of peaks are evaluated by Commission Internationale de I’Eclairage technique. Using this phosphor, the desired CIE values including emissions throughout the violet (390u2005nm) and blue (427u2005nm) of the spectra were achieved. Efficien...