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

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 ⁴G_5/2 → (⁶H_5/2, ⁶H_7/2, ⁶H_9/2 and ⁶H_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)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.