Synthesis and investigation of orange-emitting Eu2+ doped Ba4Li2B10O20 phosphor

Highlights: • Ba₄Li₂B₁₀O₂₀: Eu²⁺ phosphor was firstly prepared by solid-state method. • Crystal structure and luminescence properties of Ba₄Li₂B₁₀O₂₀: Eu²⁺ phosphors were studied. • Ba₄Li₂B₁₀O₂₀: Eu²⁺ exhibits strong orange emission with broadband UV absorption. • The corresponding concentration quenching and thermal quenching process has been investigated in detail. -- Abstract: Orange-emitting Eu²⁺ activated Ba₄Li₂B₁₀O₂₀ phosphors were synthesized by a traditional solid-state reaction at elevated temperature. The synthesis and luminescent properties of the phosphors were studied in detail. The Ba₄Li₂B₁₀O₂₀: Eu²⁺ has shown a broad and intense orange emission band centered at 585 nm corresponding to 330 nm excitation wavelength. The critical quenching concentration of Eu²⁺ in Ba₄Li₂B₁₀O₂₀ was about 0.04, and the corresponding concentration quenching mechanism was verified to be the electric multipolar interaction. The fluorescence lifetime of Eu²⁺ emission and the thermal-dependent luminescence property have been investigated. The results suggest that Ba₄Li₂B₁₀O₂₀: Eu²⁺ phosphors have potential applications in UV-excited LEDs.