Luminescence properties of Eu2+-activated Ca0.13Sr0.87Al2Si2O8: A bluish green phosphor for solid state lighting

Abstract

Eu 2+ activated phosphors with the composition of Ca 013 Sr 0.87 Al 2 Si 2 O 8 were synthesized by combustion technique. The luminescent properties of these phosphors have been explored by analyzing their excitation and emission spectra with the help of photoluminescence (PL) spectroscopy. The phase-forming processes and presence of associated mode of vibrations of the phosphors were studied by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) respectively. Under ultra-violet (UV) excitation, Ca 013 Sr 0.87 Al 2 Si 2 O 8 phosphors had broad emission spectrum between 418 and 550 nm in the blue-green region of spectra corresponding to 4f 6 5d ->4f 7 transition of Eu 2+ ion. The results show Ca 013 Sr 0.87 Al 2 Si 2 O 8 : Eu 2+ is a promising host candidate for the phosphors and can be used for improving the efficiency and quality of phosphor-converted white light-emitting diodes.