Synthesis and photoluminescence properties of a novel high-efficiency red-emitting Ca2LuSbO6:Eu3+ phosphor for WLEDs

With excellent optical performances, Eu3+-doped compounds as the red-emitting components towards white light-emitting diodes (WLEDs) have been the research hotspot in recent years. In this paper, novel doubleperovskite Ca2LuSbO6:Eu3+ red-emitting phosphors, which exhibited strong absorption in near-ultraviolet/blue spectrum ranges and bright red emissions around 613 nm, were successfully prepared via the solid-state method. The X-ray diffraction and refinement results confirmed that the samples crystallized in a monoclinic system. Besides, the critical quenching concentration of Eu3+ ion was 0.3 mol, and the optimal Ca2LuSbO6:Eu3+ phosphors demonstrated a high internal quantum efficiency of 82%, with the CIE chromaticity coordinates of (0.661, 0.339). The fluorescence lifetimes of the samples were in a microsecond range and the thermal quenching characteristic was also discussed. All the obtained luminescence properties verified that the Ca2LuSbO6:Eu3+ phosphor might be a potential red component for the ultraviolet/blue chip-based WLEDs.