Luminescence and thermoluminescence properties of Sr3WO6:Eu3+ phosphor

Sr3−xWO6:xEu3+ (x varies from 0.01 to 0.06) phosphors have been prepared at high temperature by the solid-state method. The crystal structure of Sr2.95WO6:0.05Eu3+ phosphor has been determined as a triclinic P-1 space group with a=8.3608 (19) Å, b=8.2903 (24) Å, c=8.2145 (23) Å, α=89.79 (3)°, β=89.82 (3)°, and γ=89.753 (22)°. The excitation spectrum of Sr2.95WO6:0.05Eu3+ phosphor reveals five excitation bands: one is assigned to the charge-transfer (CTLM) band of Sr3WO6 host at 307 nm, and another is assigned to intra-4f transitions between 393 nm and 600 nm. The emission spectrum of Sr2.95WO6:0.05Eu3+ phosphor exhibits a series of emission bands, which are attributed to the 5D0→7Fj (j=0−4) transitions of Eu3+ ions. The luminescence studies revealed that the Eu3+ ions show high luminescent efficiency in emitting red light at 616 nm. The thermoluminescence glow curve shows one dominant glow peak observed at 56 °C which is related to the defects at shallow trap depth. The trap parameters mainly activation energy (Ea) and the order of the kinetics (b) were evaluated by using Rasheedyʹs three points method (TPM).