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Far-red phosphors with higher thermal stability and exhibit excellent spectral compatibility with the far-red light phytochrome (P FR) absorption spectrum. They are currently a research hotspot and widely applied in plant growth lamps. In this study, we have prepared a Mn4+-activated Sr 2 ScNbO 6 far-red phosphor by using the high temperature solid phase method in air. The strongest excitation center of the Sr 2 ScNbO 6 : Mn4+ phosphor was located at 365 nm. Due to the 2E g →4A 2 g transition, this phosphor generates strong deep-red light at 703 nm, which significantly overlaps with the absorption spectrum of plant phytochrome P FR. The variable temperature photoluminescence (PL) emission spectra from 303 K to 503 K confirmed this phosphor possesses relatively good thermal stability. In addition, the concentration quenching effect and the thermal quenching mechanism are studied in detail. The results demonstrate that Sr 2 ScNbO 6 : 0.4 % Mn4+ phosphor provides a novel choice for the far-red phosphor required for short-day plant cultivation. • A double perovskite phosphor Sr 2 ScNbO 6 : Mn4+ was synthesized. • Sr 2 ScNbO 6 : Mn4+phosphor shows relatively good thermal stability, I 423 K /I 303 K ≈ 44 %. • The Mn4+ far-red emission matches well with the absorption spectral of P FR. • The materials show promising application in the field of short-day plant cultivation. [ABSTRACT FROM AUTHOR]