Photoluminescence characterization of a novel red-emitting phosphor In2(MoO4)3:Eu3+ for white light emitting diodes

Abstract

The red-emitting phosphor In2(MoO4)3:Eu3+ with cubic crystal structure was synthesized by a conventional solid-state reaction technique and its photoluminescence properties were investigated. The prepared phosphor can be efficiently excited by ultraviolet (395nm) and blue (466nm) light. The emission spectra of the phosphor manifest intensive red-emitting lines at 612nm due to the electric dipole 5D0→7F2 transitions of Eu3+. The chromaticity coordinates of x=0.63, y=0.35 (λex=395nm) and x=0.60, y=0.38 (λex=466nm) are close to the standard of National Television Standard Committee values (NTSC) values. The concentration quenching of In2(MoO4)3:Eu3+ is 40mol% and the concentration self-quenching mechanism under 466nm excitation was the dd intereaction. As a result of the strong emission intensity and good excitation, the phosphor In2(MoO4)3:Eu3+ is regarded as a promising red-emitting conversion material for white LEDs.