A comparative photoluminescence and Judd–Ofelt study on alumino silicate phosphors

Abstract

In this article, un-doped and (0.01) Eu3+-activated series of M2Al2SiO7 (M = Ca, Sr, Ba) phosphors have been prepared via traditional high temperature solid-state reaction method. Phase purity and structural characterization of prepared phosphors were done by XRD. Estimated particle size of un-doped and Eu3+ activated M2Al2SiO7 (M = Ca, Sr, Ba) phosphors are 23.77, 19.76, 14.19 nm, 27.38, 18.21 and 16.84 nm, respectively, using Scherrer formula. To confirm the elemental composition and presence of hydrated phase EDX and FTIR analysis were performed. Photoluminescence studies and Judd–Ofelt (J–O) analysis were done. Photoluminescence studies show that all the doped phosphors show intense red emission centered at 618 nm, 619 nm and 613 nm, when excited at 394 nm due to 5D0-7FJ(J = 0,1,2,3) transition of Eu3+. Calculated CIE co-ordinates of all the phosphors are very close to commercial phosphor Y2O3:Eu3+. Calculated Judd–Ofelt (J–O) parameter reveals that Ω2 is greater than Ω4 and in all the three cases it is much greater for Ba2Al2SiO7. Thus, these phosphors can act as potential candidate for novel red-light-emitting phosphor.