Tuning the luminescence color and enhancement of afterglow properties of Sr(4−x−y)CaxBayAl14O25:Eu2+,Dy3+ phosphor by adjusting the composition

Excitation and fluorescence emission spectra of three extreme compositions of Ca, Sr and Ba in Sr4Al14O25 phosphor (viz. 4CaO·7Al2O3, 4SrO·7Al2O3 and 4BaO·7Al2O3) doped with 4 at% Eu2+ and 8 at% Dy3+ (inset shows the digital micrograph of corresponding phosphors).