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 nearinfrared emitting phosphor LaMg 0.5 Sn 0.5 O 3 :Cr 3+ 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 Ge 4+ , 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) 0.5 O 3 :Cr 3+ phosphor for plant growth was confirmed.

Near-Infrared Broadband ZnTa2O6:Cr3+ Phosphor for pc-LEDs and Its Application to Nondestructive Testing

“…The instrument and equipment used for experimental characterization are consistent with the previous work of our group. 19,20 The electroluminescence (EL) spectra and input− output parameters for the prepared NIR pc-LED devices were measured using an HP9000 photoelectric measurement system (HOPOOCOLOR, China) at a drive current of 100−700 mA.…”

Structural Rigidity Control toward Cr3+-Based Broadband Near-Infrared Luminescence with Enhanced Thermal Stability

“…With the rapid development and emerging applications of near-infrared (NIR) spectroscopy in food analysis, medical diagnosis, health monitoring, biosensing, and agriculture, traditional NIR light sources such as halogen lamps are insufficient to meet the diversified demands due to their large volumes, low luminous efficiency, and high operating temperature. − Accordingly, NIR phosphor-converted light-emitting diodes (pc-LEDs) emerged as the most promising substitutes due to their low cost, good durability, and broad and tunable emission spectra. , Benefiting from the efficient ultraviolet and blue emissive chips, the greatest challenge for the popularization of NIR pc-LEDs lies in exploring novel broadband NIR phosphors, and extensive efforts have been made presently. For instance, NIR-emitting Eu 2+ -doped (Sr,Ba)­Y 2 O 4 phosphors have been designed, and giant red-shifted emission from 620 to 773 nm can be realized by chemical substitution .…”

Light-Induced Charge Transfer to Achieve Deep-Red Emission in SrSc2O4:Bi toward Multiple Optical Applications

“…Phytochrome is an albumen in plants that mainly absorbs red and deep-red light. Phytochrome can promote plant growth, especially for the seed germination and the growth of stems and leaves Figure c shows the emission spectrum of SrSc 2 O 4 :0.03Bi and the absorption spectra of chlorophyll A­(B) and phytochrome PR­(PFR).…”

“…Phytochrome can promote plant growth, especially for the seed germination and the growth of stems and leaves. 54 Figure 6c shows the emission spectrum of SrSc 2 O 4 :0.03Bi and the absorption spectra of chlorophyll A(B) and phytochrome PR(PFR). Obviously, the emission spectrum of SrSc 2 O 4 :0.03Bi covers the absorption spectra of chlorophyll A(B) and phytochrome PR(PFR).…”