Tuning the Luminescence Properties of Blue and Far‐red Dual Emitting Gd2MgTiO6: Bi3+, Cr3+ Phosphor for LED Plant Lamp

Blue and far-red light play a key role in plant growth, so it is necessary to develop blue and far-red dual emitting phosphors. However, the match between phosphors and plant pigments is not satisfactory. In this work, we synthesized a series of blue and far-red dual emission Gd2MgTiO6: Bi3+, Cr3+ (GMTO: Bi3+, Cr3+) phosphors and discussed the luminescence performance. The blue emission at 430 nm is ascribed to P-3(1) -> S-1(0) transition of Bi3+ and the far-red emission is ascribed to T-4(2) -> (4)A(2) and E-2 -> (4)A(2) transitions of Cr3+. Notably, because of the energy competition between Cr3+ ions and host materials, the luminescence tuning realized with the content of Cr3+ doping. In addition, an energy-transfer performance occurred from Bi3+ ions to Cr3+ ions and the photoluminescence intensity of Cr3+ can be enhanced by Bi3+. The pc-LEDs devices were synthesized by GMTO: Bi3+, Cr3+ phosphor, and ultraviolet (UV) chips. Finally, the emission of GMTO: Bi3+, Cr3+ phosphor matched well with the absorption spectra of plant pigments which indicated the potential applications in LED plant lamp.