Structure, luminescence properties and energy transfer of Tb3+–Eu3+ codoped LiBaB9O15 phosphors

Abstract

A series of single-composition phosphors LiBaB₉O₁₅:Tb³⁺,Eu³⁺ have been prepared via a high-temperature solid-state reaction process. The structure and luminescence properties of phosphors are described. The LiBaB₉O₁₅:Tb³⁺ phosphor shows a characteristic green emission, with the peak located at 551 nm, which corresponds to the ⁵D₄ → ⁷F₅ transition of Tb³⁺. The LiBaB₉O₁₅:Eu³⁺ phosphor presents an obvious red emission, with the peak located at 617 nm, which is ascribed to the ⁵D₀ → ⁷F₂ transition of Eu³⁺. The highly intense red emission peaks of the Eu³⁺ ions were attributed to an effective energy transfer from the Tb³⁺ to Eu³⁺ ions in LiBaB₉O₁₅:Tb³⁺,Eu³⁺, which has been verified through the luminescence spectra and the fluorescence decay dynamics. The results mean that LiBaB₉O₁₅:Tb³⁺,Eu³⁺ phosphors might have potential applications as a red emitting phosphor for white LEDs.