Enhancing photoluminescence properties of Mn 4+ ‐activated Sr 4− x Ba x Al 14 O 25 red phosphors for plant cultivation LEDs

Abstract Non–rare earth Mn 4+ ‐activated strontium aluminate phosphor is considered to be a promising material for plant cultivation field owing to their advantage of inexpensively, environment friendly, nontoxic, and appropriate spectral range. In this paper, a Sr 4− x Ba x Al 13.99 O 25 :0.01Mn 4+ ,1.4H 3 BO 3 strontium aluminate phosphor is synthesized by a convenient high‐temperature solid‐state reaction. The photoluminescence spectra located at red region with a peak at 655 nm in the range of 600 to 750 nm that can be excited under the excitation of ultraviolet (~346 nm) or blue light (~450 nm). The shape emission band at 655 nm is attributed to the transition of 2 E g ‐ 4 A 2g . Furthermore, the emission intensity of Sr 4− x Ba x Al 13.99 O 25 : 0.01Mn 4+ ,1.4H 3 BO 3 phosphor is conducted in detail with the variety of Ba 2+ doping concentration and the intensity can be enhanced to 140.9% than the Sr 4 Al 13.99 O 25 :0.01Mn 4+ ,1.4H 3 BO 3 when the value of Ba 2+ concentration equal to 0.1 mol. In addition, the X‐ray diffraction spectra, element mapping, composition modifying, optical properties, FT‐IR spectra, diffuse reflectance spectra, thermal stability, and fluorescence lifetime are systematically investigated. According to the electro‐luminescent spectra of as‐packaged LED, indicating that the Sr 3.9 Ba 0.1 Al 13.99 O 25 :0.01Mn 4+ ,1.4H 3 BO 3 phosphor will become a great candidate for plant cultivation LEDs due to the emission spectra match well the plant pigment spectrum.