Synthesis of Dy3+ and Ce3+ activated Sr6BP5O20 and Ca6BP5O20 borophosphate phosphors

In this paper we report the modified solid state synthesis of Dy and Ce activated Sr6BP5O20, Ca6BP5O20 and (CaXSr(1-X))(6)BP5O20 phosphors. The prepared phosphors were characterized by the x-ray powder diffraction and photoluminescence techniques. The PL excitation spectra showed the excitation peaks ranging from 300 to 400 nm due to the 4f -> 4f transitions of Dy3+ ions. This mercury-free excitation is useful for solid state lighting and light-emitting diode (LED). The PL emission spectrum of Dy3+ ion under 348 nm excitation was observed at 483 nm (blue) due to F-4(9/2) -> H-6(15/2) transitions. Other emissions were observed at 576 nm (yellow) due to F-4(9/2) -> H-6(13/2) transitions and 670 nm (red) due to F-4(9/2) -> H-6(11/2) transitions in prepared borophosphate phosphor. Dy activated Ca6BP5O20 phosphor showed intense emission as compared with Sr6BP5O20 phosphors which have been reported in this paper. From these characteristics, Dy activated Sr6BP5O20, Ca6BP5O20 and (CaXSr(1-X))(6)BP5O20 phosphors are one of the candidates for the white LED. The PL emission spectra of Ce3+ ion in the Sr6BP5O20, Ca6BP5O20 and (CaXSr(1-X))(6)BP5O20 phosphors in the UV region under broad band excitation at around 247 nm are presented for the scintillation application.