A series of Mn -doped and Mn ,K -co-doped Ba LaTaO (BLT) double-perovskite phosphors was synthesized using a high-temperature solid-state reaction. The phase purity and luminescence properties were also studied. The optimum doping concentration of Mn and K was obtained by investigating the photoluminescence excitation spectra and photoluminescence emission spectra. The comparison of BLT:Mn phosphors with and without K ions shows that the photoluminescence intensity of K -doped phosphors was greatly enhanced. This is because there was a charge difference when Mn ions were doped with Ta ions in BLT. Mn -K ion pairs were formed after doping K ions, which hinders the nonradiative energy transfer between Mn ions. Therefore, the luminescence intensity, quantum yield, and thermal stability of phosphors were enhanced. The electroluminescence spectra of BLT:Mn and BLT:Mn ,K were measured. The spectra showed that the light emitted from the phosphors corresponded well with chlorophyll a and phytochrome P . The results show that the BLT:Mn ,K phosphors had good luminescence properties and application prospects and are ideal materials for plant-illuminated red phosphors.
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