Preparation and luminescence properties of broadband red-emitting Sr3LiSbO6: Mn4+, Sm3+ phosphor

A series of Sr 3 LiSbO 6 : Mn 4+ and Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ red phosphors were synthesized using the high-temperature solid-state method. The phase, luminescence properties, and thermal stability of these phosphors were thoroughly investigated. The Sr 3 LiSbO 6 : Mn 4+ phosphors exhibited a strong far-red emission band ranging from 650 to 750 nm centered at 693 nm, which is attributed to the 4 E 2g  →  4 A 2g transition of Mn 4+ . To further broaden the emission spectra of the Sr 3 LiSbO 6 : Mn 4+ phosphors, doping with Sm 3+ ions as a co-activator was performed. The Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ phosphors exhibited two emission bands located at 601 nm and 693 nm (red and far red), which are well-matched with the absorption bands of phytochromes Red (P R) and phytochromes Far-Red (P FR) . Additionally, the emission intensity and thermal stability of the phosphors were improved. Sr 3 LiSbO 6 : Mn 4+ emits far-red light in the range of 650 nm-750 nm, while Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ emits red light in the range of 500 nm-750 nm. In the context of Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ , we designed a LED lamp for plant growth and carried out experiments on plant seed germination. The findings from these experiments demonstrate the positive impact of red LEDs on plant growth and development. Additionally, our results suggest the potential application of red phosphors with Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ in plant growth.