Enhanced photoluminescence and energy transfer performance of YAlGaO:Mn,Dy 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 and Dy co-doped YAlGaO 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 E → A of Mn, F → H and F → H of Dy, respectively. The three emissions match the absorption spectra of chlorophyll A and chlorophyll B well. Meanwhile, the energy transfer from Dy to Mn 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 YAlGaO:Mn,Dy phosphor. The excellent properties indicate that the synthesized phosphor has a promising application in the optical agricultural industry.