Luminescence properties of Sr2ZnWO6:Eu3+ phosphors

The photoluminescence properties of self- and Eu3+-activated Sr2−2xEuxNaxZnWO6 (x = 0, 0.02, 0.05, 0.08, 0.1, and 0.15) compounds are investigated in this study. Due to the charge transfer transition of the (WO6)6− group, Sr2ZnWO6 has a bluish-green and broad-band emission with a peak at about 523 nm when excited by 371 nm light. After Sr2+ ions are partially substituted by Eu3+ ions, the red emission at about 617 nm is observed except for the bluish-green emission, thus obtaining white light. The emission intensity at about 617 nm is enhanced with increasing the concentration of Eu3+ (x), to achieve the maximum when x = 0.1. But, the concentration quenching of Eu3+ emission appeared if x > 0.1. The red emission of Sr1.8Eu0.1Na0.1ZnWO6 peaking at 617 nm is investigated at various temperatures, and the process of energy transfer between the (WO6)6− group and Eu3+ ions is discussed. The results showed that Sr2−2xEuxNaxZnWO6 is a potential phosphor for full-color light emitting diode.