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 (λ_ex = 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.