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

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 ⁵D₀-⁷F_J(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.