Near-ultraviolet light induced red emission in Sm3+-activated NaSrLa(MoO4)O3 phosphors for solid-state illumination

Abstract

The Sm3+-activated NaSrLa(MoO4)O3 phosphors were synthesized by the solid-state reaction technique. Upon 403 nm excitation, bright reddish-orange emissions arising from the 4G5/2 → (6H5/2, 6H7/2, 6H9/2 and 6H11/2) transitions were gained in these resultant compounds. The optimal luminescence intensity was obtained at the dopant concentration of 4 mol% and the dipole-dipole interaction mechanism was contributed to the concentration quenching process in the NaSrLa(MoO4)O3:Sm3+ phosphors. The temperature dependent luminescent properties were discussed in detail and the crossover process was responsible for the involved thermal quenching behavior. At a forward bias current of 100 mA, the fabricated LED lamp emitted reddish-orange light with the color coordinate of (0.602, 0.316). These properties demonstrated that the Sm3+-activated NaSrLa(MoO4)O3 phosphors were promising red-emitting materials for solid-state illumination.