Bi3+ and Mn4+ co-doped La2MgGeO6 blue-red tunable emission phosphors based on energy transfer for agricultural applications

Abstract

Nowadays, the requirements for plant lighting for plant growth are becoming stronger. Under excitation of ultraviolet light 200–350 nm, Bi3+ and Mn4+ doped La2MgGeO6 phosphors can emit blue and red, respectively. By co-doping, blue-red emission can be achieved, which can be used in agricultural production. Based on energy transfer from Bi3+ to Mn4+, the luminescence intensity of Mn4+ can be doubled. The transfer efficiency of Bi3+ to Mn4+ increases linearly with the increase of Mn4+ concentration. The blue/red intensity ratio can be adjusted to meet the different needs of different plants by changing the doping concentrations of Bi3+ and Mn4+. Our research indicates that Bi3+ and Mn4+ co-activate blue-red phosphors have potential applications in agricultural production.