Photoluminescence properties of Eu3+-activated Y1.50Sc0.50O3 phosphors

Abstract

In this research, Eu³⁺ activated and Dy³⁺-co-doped Y₂O₃ based phosphors have been synthesized by solid-state reaction method under open atmosphere. The host lattice is composed of 0.25 moles of Sc₂O₃ which is added to phosphor composition. Thus, Sc³⁺ substitution of Y³⁺ ions is implemented to form Y_1.40Sc_0.50O₃ host lattice. The thermal analysis (DTA/TG) have been carried out from 50 °C to 1400 °C for preliminary examination of thermal behavior of phosphors during heat treatments. After the heating process, the phase formations are characterized by X-ray diffraction resulted as Y₂O₃ single phase cubic structure. The effects of Eu³⁺ and Dy³⁺ dopant ions on the photoluminescence and phase formation properties of the hosts are investigated and determined as Dy³⁺-co-doped phoshor has the reduced excitation/emission intensities as well as decay lifetimes.