A novel blue-light excitable Pr3+ doped (Sr,Ba)LaMgTaO6 phosphor for plant growth lighting

In this work, a series of Pr3+ ions doped (Sr,Ba)LaMgTaO6 phosphors were prepared and applied for plant growth lighting. Under 450 nm excitation, (Sr,Ba)LaMgTaO6:Pr3+ exhibits intense reddish emission at around 650 nm which is assigned to the 3P0→3F2 transition of Pr3+ ions. The luminescence intensity reaches to the maximum at 2.5 mol% Pr3+ doping content both in SrLaMgTaO6:Pr3+ and BaLaMgTaO6:Pr3+ systems. Meanwhile, the internal quantum efficiency (IQE) test shows that the IQE of the SrLaMgTaO6:0.025Pr3+ phosphor is 33.34% upon blue light excitation. The decay curves and temperature-dependent luminescence measurements of the (Sr,Ba)LaMgTaO6:Pr3+ phosphors were performed and investigated in detail. The red light emitting diodes (LEDs) were packaged using the SrLaMgTaO6:Pr3+ and BaLaMgTaO6:Pr3+ phosphors combined with a blue LED chip, which are well-overlapped with the absorption band of photosynthesis. Results indicate that the (Sr,Ba)LaMgTaO6:Pr3+ can serve as a component of the red light in plant-growth LEDs.