Luminescence properties of Eu2+ and Ce3+ in Na5Ca2Al(PO4)4 produced by the combustion-assisted synthesis method

Abstract New greenish-blue luminescence Eu 2 + /Ce 3 + codoped Na 5 Ca 2 Al(PO 4 ) 4 phosphors were prepared by a combustion-assisted synthesis method. X-ray powder diffraction analysis confirmed the formation of Na 5 Ca 2 Al(PO 4 ) 4 host lattice.. The Eu 2 + -doped Na 5 Ca 2 Al(PO 4 ) 4 sample has an efficient greenish-blue emission band that peaks at 476 nm, while Ce 3 + -doped Na 5 Ca 2 Al(PO 4 ) 4 sample exhibits a strong emission band at 391 nm. Efficient energy transfer from Ce 3 + to Eu 2 + occurs due to the large spectral overlap between the emission of Ce 3 + and excitation of Eu 2 + . Co-doping Ce 3 + enhances the emission intensity of Eu 2 + greatly by transferring its excitation energy to Eu 2 + , and Ce 3 + plays a role as a sensitizer. Ce 3 + /Eu 2 + co-doped Na 5 Ca 2 Al(PO 4 ) 4 can possibly be applied as greenish-blue phosphors in the fields of lighting and display.