Photoluminescence properties of M2ZnSi2O7: Eu2+ (M=Sr, Ba)

The hardystonite phosphors of Eu2+ activated M2ZnSi2O7 (M=Sr, Ba) were synthesized by combustion-assisted method. They were systematically characterized by photoluminescence excitation and emission spectra. The emission spectra of these two phosphors showed that the main emission peaks are at 475 and 503 nm due to 4f65d1→4f7 transition of Eu2+. Both phosphors could be efficiently excited in the wavelength range of 250-425 nm where the near ultraviolet light-emitting diode was well matched. The (x, y) color coordinates were determined with the emission values (x, y)=(0.41, 0.21) and (0.16, 0.45) for the M2ZnSi2O7: Eu2+ (M=Sr, Ba) phosphors.