Accessing deep-red emission using chemical units cosubstituted LaTiSbO6:Mn4+ phosphor

Red light-emitting phosphors are important to the field of plant lighting. Therefore, it is necessary to further optimize phosphor materials. Herein, we synthesized a sequence of phosphor LaTiSbO6:Mn4+ (LTS:Mn4+). Due to the 2E to 4A2 transition, LTS:Mn4+ phosphors can emit red light in the range of 620–780 nm, with an emission peak at 687 nm. Chemical unit cosubstitution (substituting W6+ - Al3+/W6+ - Ga3+ for Ti4+ - Sb5+) was used as a method to enhance the luminescence properties of LTS:Mn4+. When the substitution ratio of W6+ - Ga3+ and W6+ - Al3+ reached 0.1% and 0.75%, respectively, the luminescence intensity increased to 204% and 182%. Using the LTS:Mn4+, W6+, Ga3+ phosphor and a 470 nm blue chip to fabricate a pc-LED device, the electroluminescence (EL) spectrum is well matched with the phytochrome absorption range. Therefore, the LTS:Mn4+ phosphor will be very promising for plant growth.