Solid-state synthesis and luminescent properties of yellow-emitting phosphor NaY (MoO4)2:Dy3+ for white light-emitting diodes

A yellow-emitting phosphor NaY(MoO4)(2):Dy3+ was synthesized using a solid-state reaction at 550 degrees C for 4 h, and its luminescent properties were investigated. Its phase formation was studied using X-ray powder diffraction analysis, and there were no crystalline phases other than NaY(MoO4)(2). NaY(MoO4)(2):Dy3+ produced yellow emission under 386 or 453 nm excitation, and the prominent luminescence was yellow (575 nm) due to the F-4(9/2) -> H-6(13/2) transition of Dy3+. For the 575 nm emission, the excitation spectrum had one broad band and some narrow peaks; the peaks were located at 290, 351, 365, 386, 426, 453 and 474 nm. Emission intensities were influenced by the Dy3+ doping content and a concentration quenching effect was observed; the phenomenon was also proved by the decay curves. Moreover, the Commission International de I'Eclairage chromaticity coordinates of NaY(MoO4)(2):Dy3+ showed similar values at different Dy3+ concentrations, and were located in the yellow region. Copyright (C) 2015 John Wiley & Sons, Ltd.