Thermally Stable Red-Emitting Oxide Ceramics for Laser Lighting

作者：Yang, Zhiyu; de Boer, Tristan; Braun, Patrick M.; Su, Binbin; Zhang, Qinyuan; Moewes, Alexander; Xia, Zhiguo^*

来源：Advanced Materials, 2023, 35(30).

DOI：10.1002/adma.202301837

• ceramics
• laser lighting
• oxide-based perovskites
• red emission

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 Eu2+-activated oxide-based double perovskites are explored as red emitters with thermally stable photoluminescence. Sr3TaO5.5: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.

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