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

Abstract

The SrMgSi2O6:Eu2+ and SrMgSi2O6:Eu3+ 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 \( {\text{P}}\overline{42}_{1} {\text{m}} \). 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 SrMgSi2O6:Eu2+ phosphor would emit blue (468 nm) light, belonging to the broad emission band ascribed to the 4f65d1 → 4f7 transition. The emission spectrum (λex = 395 nm) of SrMgSi2O6:Eu3+ phosphor were consisted of two emission peaks at 590 and 614 nm, which were attributed to 5D0 → 7F1 and 5D0 → 7F2 of Eu3+ ions. The strongest excited band at 395 nm can be assigned to 7F0 → 5L6 transition of Eu3+ ions due to the typical f–f transitions within Eu3+ of 4f6 configuration. Commission International de I’Eclairage color coordinates of SrMgSi2O6:Eu2+ and SrMgSi2O6:Eu3+ phosphors were suitable as blue and orange–red light emitting phosphors respectively.