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

Majority of Mn(4+) 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(4)Al(14)O(25):0.01Mn(4+) is found by substituting 0.1Ga(3+). 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(3)BO(3)/AlF(3) 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(4)Al(14)O(25):0.01Mn(4+),0.007Mg(2+),0.1Ga(3+) 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.