AbstractLaser‐driven phosphor‐converted white light sources are highly desirable for their unprecedented energy efficiency and lighting quality. However, important challenges remain due to a lack of efficient and stable red‐emitting materials. Here Eu²⁺‐activated oxide‐based double perovskites are explored as red emitters with thermally stable photoluminescence. Sr₃TaO_5.5:Eu²⁺ ceramics exhibit a red emission band peaking at 620 nm upon blue laser pumping owing to the Eu²⁺ occupation at highly ordered substitutional lattice sites. A constructed laser‐driven white light wheel under an incident power density of 19.2 W mm⁻² presents a record luminous flux of 1115 lm with an excellent color rendering index of 90. This study invigorates the development of Eu²⁺‐activated oxide‐based ceramics with thermally stable luminescence for laser‐pumped lighting and display applications.