Enhanced luminescence performances of BaLaMgTaO:Mn red phosphor by Bi, Ca doping for indoor plant lighting supplementary LED.

A new perovskite BaLaMgTaO:Mn (BLMTO:Mn) red phosphor was synthesized for the first time via the high-temperature solid-state method. The emission band of the phosphor ranges from 650 to 750 nm, which matches well with the absorption band of P and P. By doping of Bi and Ca ions in the BLMTO:Mn phosphor, a 4.76-fold enhancement in the luminescence emission intensity was achieved. The optimized BLMTO:0.5%Mn, 1.5%Bi, 2%Ca phosphor exhibited a high quantum efficiency of 65% and a high color purity of 98.1% with the chromaticity coordinate (CIE) at (0.733, 0.267). Finally, a LED device was fabricated with the BLMTO:0.5%Mn, 1.5%Bi, 2%Ca phosphor for further agricultural lighting, which emits warm white light with a low color temperature of 3549 K. The result indicates that the BLMTO:Mn, Bi, Ca phosphors have a potential for applications in agricultural cultivations.