Energy transfer and tunable luminescence of Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphors for white LED applications

Abstract A series of solid-solution phosphors Na 2 (Y,Eu)Mg 2 V 3 O 12 were prepared using solution combustion reaction. X-ray diffraction studies verified the formation of single phase Na 2 (Y,Eu)Mg 2 V 3 O 12 with garnet structure. Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphors show not only a broad emission band with a maximum at 510 nm due to the [VO 4 ] 3− group but also several sharp emission lines due to the Eu 3+ ions. The energy transfer from [VO 4 ] 3− to Eu 3+ was discussed on the base of the spectral analysis. The color-tunable emissions of the Na 2 (Y,Eu)Mg 2 V 3 O 12 phosphor as a function of Y/Eu ratio are realized by continuously generating the varied hues from yellowish-green to reddish-orange. This indicates that the obtained phosphor may have potential applications in the field of UV-based white LEDs.