Energy transfer and tunable luminescence of Na2(Y,Eu)Mg2V3O12 phosphors for white LED applications

• Iso-structural garnet-type Na2(Y,Eu)Mg2V3O12 solid solution were synthesized.
• Efficient energy transfer from [VO4]3− to Eu3+ ions in this phosphor is observed obviously.
• Tuning the Y/Eu ratio generates the varied hues from yellowish-green to reddish-orange.
• This kind of phosphor can be potentially used in UV pumped LEDs.

A series of solid-solution phosphors Na2(Y,Eu)Mg2V3O12 were prepared using solution combustion reaction. X-ray diffraction studies verified the formation of single phase Na2(Y,Eu)Mg2V3O12 with garnet structure. Na2(Y,Eu)Mg2V3O12 phosphors show not only a broad emission band with a maximum at 510 nm due to the [VO4]3− group but also several sharp emission lines due to the Eu3+ ions. The energy transfer from [VO4]3− to Eu3+ was discussed on the base of the spectral analysis. The color-tunable emissions of the Na2(Y,Eu)Mg2V3O12 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.

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