Photoluminescence properties of Ba2LaSbO6:Mn4+ deep-red-emitting phosphor for plant growth LEDs

Abstract In this work, Ba 2 LaSbO 6 :Mn 4+ phosphors are prepared successfully in air by solid-state reaction method, which is confirmed by the X-ray powder diffractions patterns, decay curves, the time-resolved emission spectra and luminescence properties. Monitored at 678 nm, the excitation spectrum of Ba 2 LaSbO 6 :Mn 4+ phosphor is observed in the range of 250 − 575 nm. Under the excitation of 380 nm, Ba 2 LaSbO 6 :Mn 4+ phosphor exhibits strong deep-red emission in the range of 625 − 740 nm with emission peak at 678 nm due to the 2 E → 4 A 2 transition of Mn 4+ ion. The emission spectrum well matchs with the absorption spectrum of plants in the range of 625 − 740 nm. The temperature-dependent emission spectra illustrate the thermal stability of Ba 2 LaSbO 6 :Mn 4+ phosphor and the thermal quenching mechanism is explained by the configuration coordinate of Mn 4+ ion. The luminous mechanism of Ba 2 LaSbO 6 :Mn 4+ phosphor is explained by the Tanabe-Sugano energy level diagram of Mn 4+ ion. The experimental results show that the Ba 2 LaSbO 6 :Mn 4+ deep-red-emitting phosphor would have potential application in plant growth LEDs.