abstract
At present, it is highly desirable to seek the inorganic phosphors with deep-red emission for the plant cultivation lighting. In this paper, the lanthanide Gd3+ -incorporated Ba3WO6:Mn4+ oxide phosphors were successfully prepared by the conventional high-temperature solid state reaction. The oxide phosphors were confirmed to crystallize into the double-perovskite structure corresponding to the cubic system with space group Fm-3m. Under the excitation with ultraviolet light 365 nm, all the phosphor samples displayed the deep-red emission band from 650 to 750 nm with the peaks around 678 and 692 nm, which was attributed to the intrinsic 2Eg.4A2g transition of activator Mn4+. It was observed that the luminescence of Ba3WO6:Mn4+ material was almost ignorable due to the low quantum yield (less than 2%). After the introduction of certain amount of Gd3+ ions to substitute the octahedral Ba2+ site, the double-perovskite structure of the phosphor was hardly changed, but the deep-red emission intensity of Mn4+ was efficiently enhanced and the quantum yield reached 30.4% through the optimization to the Gd3+ and Mn4+ doping concentration. The optimal composition was Ba2.1Gd0.9WO6:0.3% Mn4+ and the Commission International de L'Eclairage (CIE) color coordinate was (0.731, 0.269), which located at the deep-red spectral region. The mechanism for the enhanced deep-red luminescence after Gd3+ incorporation was discussed. Owing to the highly suited to the phytochrome absorption wavelength, the optimized oxide phosphor with bright deep-red emission in the 650-750 nm range is a potential candidate for the plant cultivation lighting.
keywords
PHYTOCHROME P-FR; LUMINESCENCE PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; EXCELLENT RESPONSIVENESS; EMITTING PHOSPHOR; HIGHLY EFFICIENT; COLOR CONVERTER; ENERGY-TRANSFER; MN4+; EXCITATION
subject category
Materials Science
authors
Cao, ZY; Wu, JY; Shi, SK; Wang, JY; Fu, LS
our authors
Lianshe Fu
Assistant ResearcherProjects
Nano-argilas para remoção/captura de fosfatos (P) e sua reutilização como fertilizante (NATURAL)
acknowledgements
This work was financially supported by Natural Science Foundation of China (51972097) and Science Foundation of Hebei Normal University, China (L2019K11). The authors would like to thank Prof. Li Xu from Hebei University for performing the XRD pattern refinement and electroluminescence measurement. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDP/50011/2020&UIDB/50011/2020, financed by national funds through the Foundation for Science and Technology/MCTES, Portugal.