On the luminescence of Ce3+, Eu3+, and Tb3+ in novel borate LiSr4(BO3)3

This paper reports on the photoluminescence (PL) and time-resolved properties of Ce(3+), Eu(3+), and Tb(3+) in novel LiSr(4)(BO(3))(3) powder phosphors. Ce(3+) shows an emission band peaking at 420 nm under 350-nm UV excitation. Energy transfer from Ce(3+) to Mn(2+) takes place in the co-doped samples. Eu(3+) shows red emission under near UV excitation. LiSr(4)(BO(3))(3):Eu(3+) phosphor could be a suitable candidate for phosphor-converted solid state lighting. The luminescence lifetime is 2.13 ms for Eu(3+) in LiSr(4)(BO(3))(3):0.001Eu(3+). As Eu(3+) concentration increasing, the decay curves deviate from exponential behavior. Tb(3+) shows the strongest (5)D(4)→(7)F(5) emission line at 540 nm. Decay curves of (5)D(4)→(7)F(5) and (5)D(3)→(7)F(5) emission with different Tb(3+) concentrations were also measured. Cross-relaxation process is discussed based on the decay curves.