Near-Infrared Emitting Phosphor LaMg_0.5(SnGe)_0.5O₃:Cr³⁺ for Plant Growth Applications: Crystal Structure, Luminescence, and Thermal Stability

Abstract

Corresponding to the absorption curve of plant photosensitive pigment Pfr, near-infrared light has a broad application prospect in plant lighting. In order to explore this plant growth lamp, the novel near-infrared emitting phosphor LaMg_0.5Sn_0.5O₃:Cr³⁺ was synthesized, which can be efficiently excited by 467 nm blue light. There are two luminescence centers, which were proven by testing the low-temperature spectrum, the excitation spectrum at different wavelengths, and the lifetime decay curve, and the two cell sequence substitution processes were obtained by Rietveld refinements of XRD. By introducing Ge⁴⁺, its luminescence intensity has been increased 1.6 times and the intensity at 150 °C remains at almost 80% that at room temperature. Finally, two different kinds of illumination experiments for plant growth were carried out, and the feasibility of the LaMg_0.5(SnGe)_0.5O₃:Cr³⁺ phosphor for plant growth was confirmed.