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 we explore Eu2+ -activated oxide-based double perovskites as red emitters with thermally stable photoluminescence. Sr3 TaO5.5 :Eu2+ ceramics exhibit a red emission band peaking at 620nm 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 19.2W/mm2 presents a record luminous flux of 1115lm with an excellent color rendering indexof 90. Our study invigorates the development of Eu2+ -activated oxide-based ceramics with thermally stable luminescence for laser pumped lighting and display applications. This article is protected by copyright. All rights reserved.