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.