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• Ba 2 LaNbO 6 :Cr3+,Yb3+ double perovskite far-red and near-infrared phosphors were synthesized by high-temperature solid-state method. • Under 324 nm UV excitation, Ba 2 LaNbO 6 :Cr3+,Yb3+ phosphors emit far-red and near-infrared light in the ranges of 620–760 nm and 920–1120 nm, corresponding to the transitions Cr3+:2E→4A 2 and Yb3+:2F 5/2 →2F 7/2 , which coincides well with the absorption spectra of photosensitive pigment P FR and photosynthetic bacteria, respectively. Ba 2 LaNbO 6 :Cr3+,Yb3+ double perovskite far-red and near-infrared phosphors were synthesized by high-temperature solid-state method. The crystal structure and optical properties were systematically investigated, encompassing PL, PLE, and temperature-dependent PL spectra. The calculated value D q /B of Ba 2 LaNbO 6 :0.005Cr3+ phosphor was calculated to be 2.59, signifying a robust crystal field strength within the [NbO 6 ] octahedral environment occupied by Cr3+ ions. Under 324 nm UV excitation, Ba 2 LaNbO 6 :Cr3+,Yb3+ phosphors emit far-red and near-infrared light in the ranges of 620–760 nm and 920–1120 nm, corresponding to the transitions Cr3+:2E→4A 2 and Yb3+:2F 5/2 →2F 7/2 , which coincides well with the absorption spectra of photosensitive pigment P FR and photosynthetic bacteria, respectively. The energy transfer mechanisms involving Cr3+ and Yb3+ ions were also thoroughly investigated. The results demonstrate that Ba 2 LaNbO 6 :Cr3+,Yb3+ phosphors have potential applications in plant cultivation LEDs. [ABSTRACT FROM AUTHOR]