Photoluminescence characterization of Dy3+ and Eu2+ ion in M5(PO4)3F (M=Ba, Sr, Ca) phosphors

Abstract: Photoluminescence investigation of Eu and Dy activated phosphate based phosphors prepared by combustion synthesis, characterized by XRD (X-ray diffraction) and photoluminescence techniques, has been reported. PL excitation spectrum of M5(PO4)3F:Dy phosphors shows the excitation peaks ranging from 300 to 400nm due to 4f→4f transitions of Dy3+ ions. PL emission spectrum of Dy3+ ion under 348nm excitation gives PL emission at 482nm (blue) due to 4F9/2 → 6H15/2 transitions, 574nm (yellow) emission due to 4F9/2 → 6H13/2 transitions and 670nm (red) due to 4F9/2 → 6H11/2 transitions, gives BYR (blue–yellow–red) emissions. The Eu2+ broad band PL emission spectrum was observed in M5(PO4)3F:Eu phosphor at 440nm in the blue region of the spectrum due to 5d→4f transition at 352nm excitation. The 300–400nm is Hg-free excitation (Hg excitation is 85% 254nm wavelength of light and 15% other wavelengths), which is characteristic of solid-state lighting phosphors. Hence PL emission in divalent europium and trivalent dysprosium may be efficient photoluminescent materials for solid-state lighting phosphors. [Copyright &y& Elsevier]