Solid‐state synthesis and luminescent properties of yellow‐emitting phosphor NaY(MoO 4 ) 2 :Dy 3+ for white light‐emitting diodes

A yellow‐emitting phosphor NaY(MoO 4 ) 2 :Dy 3+ was synthesized using a solid‐state reaction at 550 °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(MoO 4 ) 2 . NaY(MoO 4 ) 2 :Dy 3+ produced yellow emission under 386 or 453 nm excitation, and the prominent luminescence was yellow (575 nm) due to the 4  F 9/2 → 6 H 13/2 transition of Dy 3+ . 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 Dy 3+ 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(MoO 4 ) 2 :Dy 3+ showed similar values at different Dy 3+ concentrations, and were located in the yellow region. Copyright © 2015 John Wiley & Sons, Ltd.