Luminescence behavior of europium doped strontium magnesium silicate phosphor by solid state reaction method

摘要

The SrMgSi_2O_6:Eu~(2+) and SrMgSi_2O_6:Eu~(3+) phosphors were prepared by the traditional high temperature solid state reaction method. The crystal structures of sintered phosphors were an akermanite type structure which belongs to the tetragonal crystallography with space group P42_1m . The different TL kinetics parameters [activation energy (E), frequency factor (s) and order of the kinetics (b)] were evaluated and compared by the peak shape method. Under the ultra-violet excitation (340 nm), the SrMgSi_2O_6:Eu~(2+) phosphor would emit blue (468 nm) light, belonging to the broad emission band ascribed to the 4f~65d~1 → 4f~7 transition. The emission spectrum (λ_(ex) = 395 nm) of SrMgSi_2O_6:Eu~(3+) phosphor were consisted of two emission peaks at 590 and 614 nm, which were attributed to ~5D_0 → ~7F_1 and ~5D_0 → ~7F_2 of Eu~(3+) ions. The strongest excited band at 395 nm can be assigned to ~7F_0 → ~5L_6 transition of Eu~(3+) ions due to the typical f-f transitions within Eu~(3+) of 4f~6 configuration. Commission International de FEclairage color coordinates of SrMgSi_2 O_6:Eu~(2+) and SrMgSi_2O_6:Eu~(3+) phosphors were suitable as blue and orange-red light emitting phosphors respectively.