Single phased Sr_3La(PO_4)_3:Eu~(2+)/Mn~(2+) phosphors: solid state synthesis, tunable luminescence and potential applications in white light LEDs

摘要

AbstractA series of Sr3La(PO4)3:Eu2+/Mn2+phosphors were synthesized by a solid state reaction. The phase and the optical properties of the synthesized phosphors were investigated. The XRD results indicate that the doped Eu2+and Mn2+ions do not change the phase of Sr3La(PO4)3. The peak wavelengths of Eu2+single doped and Eu2+/Mn2+codoped Sr3La(PO4)3phosphors shift to longer wavelength due to the larger crystal field splitting for Eu2+and Mn2+. The increases of crystal field splitting for Eu2+and Mn2+are induced by the substitution of Sr2+by Eu2+and Mn2+in Sr3La(PO4)3host. Due to energy transfer from Eu2+to Mn2+in Sr3La(PO4)3:Eu2+/Mn2+phosphors, tunable luminescence was obtained by changing the concentration of Mn2+. And the white light was emitted by Sr3La(PO4)3:3.0 mol%Eu2+/4.0 mol%Mn2+and Sr3La(PO4)3:3.0 mol%Eu2+/5.0 mol%Mn2+phosphors.