Synthesis and luminescence properties of Eu~(3+)-activated NaLa(MoO_4)(WO_4) phosphor

摘要

NaLa_(1-y)(MoO_4)_(2-x)(WO_4)_x::yEu~(3+) series red-emitting phosphors have been synthesized by a combustion route and their crystal structure, optical and luminescent properties have been investigated. Their emission spectra show an intense red emission at 616 nm due to the ~5D_0 —> ~7F_2 transition of Eu~(3+). As the tungstate content increases, the intensity of ~5D_0 —? ~7F_2 emission of Eu~(3+) activated at wavelength of 467 nm is found to increase and reaches a maximum when the relative ratio of Mo/W is 1:1. Also, the effect of Eu~(3+) concentration on the luminescence behavior of the solid solutions is examined. The optical properties of NaLa_(.9)Eu_(0.1)(MoO_4)(WO_4) phosphor make it attractive for the application in white-light-emitting diodes (LEDs), in particular for near-UV InGaN-based white-LEDs.