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 -activated oxide-based double perovskites are explored as red emitters with thermally stable photoluminescence. Sr TaO :Eu ceramics exhibit a red emission band peaking at 620 nm upon blue laser pumping owing to the Eu occupation at highly ordered substitutional lattice sites. A constructed laser-driven white light wheel under an incident power density of 19.2 W mm presents a record luminous flux of 1115 lm with an excellent color rendering index of 90. This study invigorates the development of Eu -activated oxide-based ceramics with thermally stable luminescence for laser-pumped lighting and display applications.
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| http://dx.doi.org/10.1002/adma.202301837 | DOI Listing |
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