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A series of Mn 4+ -activated CaLaMgSbO 6 far-red-emitting phosphors were synthesized by a solid-state reaction route and the microstructure and optical characterizations were investigated in detail. Upon excitation at 370 and 469 nm, the samples showed intense far-red emission at about 708 nm originating from the 2 E g → 4 A 2g transition and the optimal Mn 4+ concentration was 0.7 mol%. The as-prepared phosphors also exhibited excellent internal quantum efficiency (88%) and high thermal stability. The emission intensity at room temperature dropped to 54% when the temperature rose to 423 K and the activation energy was 0.34 eV. The outstanding optical properties and the fact that the emission band of the obtained phosphors had a broad overlap with the absorption band of phytochrome P  FR demonstrated that the CaLaMgSbO 6 :Mn 4+ phosphors may be promising potential spectral converters for applying to indoor plant cultivation light-emitting diodes.

rsc advances

Far-red-emitting double-perovskite CaLaMgSbO<sub>6</sub>:Mn<sup>4+</sup>phosphors with high photoluminescence efficiency and thermal stability for indoor plant cultivation LEDs

Far-red-emitting double-perovskite CaLaMgSbO6:Mn4+phosphors with high photoluminescence efficiency and thermal stability for indoor plant cultivation LEDs

Far-red-emitting double-perovskite CaLaMgSbO₆:Mn⁴⁺phosphors with high photoluminescence efficiency and thermal stability for indoor plant cultivation LEDs