Synthesis, structure, and luminescence characteristics of far-red emitting Mn-activated LaScO perovskite phosphors for plant growth.

Far-red emitting phosphors LaScO:Mn were successfully synthesized a high-temperature solid-state reaction method. The X-ray powder diffraction confirmed that the pure-phase LaScO:Mn phosphors had formed. Under 398 nm excitation, the LaScO:Mn phosphors emitted far red light within the range of 650-800 nm peaking at 703 nm (14 225 cm) due to the E → A transition, which was close to the spectral absorption center of phytochrome P located at around 730 nm. The optimal doping concentration and luminescence concentration quenching mechanism of LaScO:Mn phosphors was found to be 0.001 and electric dipole-dipole interaction, respectively. And the CIE chromaticity coordinates of the LaScO:0.001Mn phosphor were (0.7324, 0.2676). The decay lifetimes of the LaScO:Mn phosphors gradually decreased from 0.149 to 0.126 ms when the Mn doping concentration increased from 0.05 to 0.9 mol%. Crystal field analysis showed that the Mn ions experienced a strong crystal field in the LaScO host. The research conducted on the LaScO:Mn phosphors illustrated their potential application in plant lighting to control or regulate plant growth.