Photoluminescence and concentration quenching of NaCa4(BO3)3:Eu3+ phosphor

Novel Eu3+-doped NaCa4(BO3)3 phosphors were synthesized by solid-state reactions. The emission spectra exhibit well-known transitions from the 5D0 level to the lower 7F manifold. The excitation spectrum monitored with 613 nm consists of broad excitation band peaking at 265 nm and some narrow lines originated from the typical Eu3+ intra-4f6 transitions. The optimum Eu3+ doped concentration, the critical distance of the concentration quenching, the fluorescence decay curves, and the mechanism of concentration quenching are investigated.