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

The red-emitting phosphor In-2(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 (395 nm) and blue (466 nm) light. The emission spectra of the phosphor manifest intensive red-emitting lines at 612 nm due to the electric dipole D-5(0) -> F-7(2) transitions of Eu3+. The chromaticity coordinates of x = 0.63, y = 0.35 (lambda(cx) = 395 nm) and x = 0.60, y = 0.38 (lambda(ex) = 466 nm) are close to the standard of National Television Standard Committee values (NTSC) values. The concentration quenching of In-2(MoO4)(3):Eu3+ is 40 mol% and the concentration self-quenching mechanism under 466 nm excitation was the d-d intereaction. As a result of the strong emission intensity and good excitation, the phosphor In-2(MoO4)(3):Eu3+ is regarded as a promising red-emitting conversion material for white LEDs. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.