Thermally Stable Red‐Emitting Oxide Ceramics for Laser Lighting

Abstract Laser‐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 Eu 2+ ‐activated oxide‐based double perovskites are explored as red emitters with thermally stable photoluminescence. Sr 3 TaO 5.5 :Eu 2+ ceramics exhibit a red emission band peaking at 620 nm upon blue laser pumping owing to the Eu 2+ 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 Eu 2+ ‐activated oxide‐based ceramics with thermally stable luminescence for laser‐pumped lighting and display applications.