A series of LiBaBO3:RE (RE=Eu 2+ /Tb 3+ /Eu 3+ ) phosphors had been synthesized by the high-temperature solid-state reaction method. The X-ray diffraction (XRD), emission spectra, excitation spectra, decay lifetimes, and diffuse reflection spectra were utilized to characterize the phosphors. The as-prepared samples had been demonstrated via XRD measurement and showed that the Eu 2+ /Tb 3+ /Eu 3+ can be efficiently doped into the host. The obtained phosphors can emit different colors light when doping with different activators. The energy transfer from Tb 3+ to Eu 3+ occurs in LiBaBO3:0.03Eu 3+ , yTb 3+ prepared in the air. While an abnormal reduction phenomenon was reported when Eu and Tb ions were co-doped in LiBaBO3 and prepared in an inferior reductive atmosphere, which showed tunable-color from blue to red based on energy transfer of Eu 2+ →Tb 3+ →Eu 3+ ions. And the energy transfer not only can occur between Eu 2+ and Tb 3+ ions, but also Tb 3+ and Eu 3+ ions. All these results reveal that Tb 3+ can play the role of storing the energy for Eu 3+ , and LiBaBO3 may be potential candidate phosphors for LEDs.
A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-temperature solid-state reaction process. The structure and luminescence properties of phosphors are described. The LiBaB9O15:Tb(3+) phosphor shows a characteristic green emission, with the peak located at 551 nm, which corresponds to the (5)D4→(7)F5 transition of Tb(3+). The LiBaB9O15:Eu(3+) phosphor presents an obvious red emission, with the peak located at 617 nm, which is ascribed to the (5)D0→(7)F2 transition of Eu(3+). The highly intense red emission peaks of the Eu(3+) ions were attributed to an effective energy transfer from the Tb(3+) to Eu(3+) ions in LiBaB9O15:Tb(3+),Eu(3+), which has been verified through the luminescence spectra and the fluorescence decay dynamics. The results mean that LiBaB9O15:Tb(3+),Eu(3+) phosphors might have potential applications as a red emitting phosphor for white LEDs.
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