Enhanced photoluminescence and energy transfer performance of Y 3 Al 4 GaO 12 :Mn 4+ ,Dy 3+ phosphors for plant growth LED lights.

Plant growth LEDs have attracted broad attention in modern society, desperate for specific phosphors with a characteristic emission band. A novel Mn 4+ and Dy 3+ co-doped Y 3 Al 4 GaO 12 phosphor were successfully prepared through a conventional high-temperature solid-state reaction. A three band emission including red (625-700 nm), orange (550-607 nm) and blue (462-490 nm) is observed in these phosphors when excited under a near-UV lamp, which is ascribed to 2 E → 4 A 2 of Mn 4+ , 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 of Dy 3+ , respectively. The three emissions match the absorption spectra of chlorophyll A and chlorophyll B well. Meanwhile, the energy transfer from Dy 3+ to Mn 4+ was confirmed by the luminescence spectra and lifetime analysis. Finally, an LED device was fabricated that consisted of a 365 nm ultraviolet chip and the Y 3 Al 4 GaO 12 :Mn 4+ ,Dy 3+ phosphor. The excellent properties indicate that the synthesized phosphor has a promising application in the optical agricultural industry.