Tunable dual emission of Bi3+ and Mn4+ co-doped LaMg0.598Nb0.402O3 double perovskite via energy transfer for plant growth lighting

Abstract

A series of Bi3+ and Mn4+ co-doped LaMg0.598Nb0.402O3 (LMNO) phosphors via a conventional high-temperature solid-state reaction. Typically, LMNO: Bi3+ shows blue emission with a peak at 450 nm under 315 nm excitation. Upon excitation at 330 nm, Bi3+ and Mn4+ co-doped LMNO phosphors present dual emission, where the blue emission is mainly from the 3P1 → 1S0 transition of Bi3+ and the red emission is attributed to the 2E → 4A2 transition of Mn4+. The red emission of the Mn4+ ions could be enhanced three times via Bi3+→Mn4+ energy transfer compared to the non-codoped samples. The relative intensities of blue emission and red emission can be easily controlled by changing the concentrations of Bi3+ and Mn4+ ions. Therefore, the emission spectra can match well with the absorption of four dominating pigments in plants. These results indicate LMNO: Bi3+, Mn4+ phosphors have potential applications in agricultural fields for promoting plant growth.