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

The Sm3+-activated NaSrLa(MoO4)O-3 phosphors were synthesized by the solid-state reaction technique. Upon 403 nm excitation, bright reddish-orange emissions arising from the (4)G(5/2) -> (H-6(5/2), H-6(7/2), H-6(9/2) and H-6(11/2)) 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)O-3: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)O-3 phosphors were promising red-emitting materials for solid-state illumination. (C) 2019 Elsevier B.V. All rights reserved.