Tremendous Acceleration of Plant Growth by Applying a New Sunlight Converter Sr 4 Al 14- x Ga x O 25 :Mn 4+ Breaking Parity Forbidden Transition

• Published in: Advanced science 2023-01, Vol.10 (2), p.e2204418
• Main Authors: Wang, Shichuan, Seto, Takatoshi, Liu, Bin, Wang, Yuhua, Li, Cancan, Liu, Zhengqiang, Dong, Haowen
• Format: Article
• Language: English
• Subjects: Chlorella; Female; Humans; Parity; Plant Development; Pregnancy; Sunlight
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.202204418

Majority of Mn activated oxide phosphors have the wavelength of excitation and emission suitable for acceleration of plant growth as light converter from sunlight to deep red. Here, it is observed that 60% increase of red emission of Sr Al O :0.01Mn is found by substituting 0.1Ga . It is clarified that the increase is originated from a unique mechanism of breaking parity forbidden transition under the substitution of cation in d-d transition by using the tool of special aberration corrected transmission electron microscope(AC-STEM), pre-edge peak (1s→3d) Mn K-edge X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS), Rietveld analysis of X-ray diffraction (XRD) patterns, and reflection spectra. Further, a combination of substituted Ga, Mg, and special double flux H BO /AlF is found to tremendously increase the emission intensity (355% up). Actual growth of chlorella and rose is examined by a combination of the cheap Sr Al O :0.01Mn ,0.007Mg ,0.1Ga and a unique reflection typed phosphor-film system as sunlight converting system. Optical density of chlorella and height of rose grass is increased by 36±14% and 174±80% compared with nonphosphor-film, respectively.