Potential tunable white-emitting phosphor LiSr4(BO3)3:Ce3+, Eu2+ for ultraviolet light-emitting diodes

A novel Ce3+/Eu2+ co-activated LiSr4(BO3)(3) phosphor has been synthesized by traditional solid-state reaction. The samples could display varied color emission from blue towards white and ultimately to yellow under the excitation of ultraviolet (UV) light with the appropriate adjustment of the relative proportion of Ce3+/Eu2+. The resonance-type energy transfer mechanism from Ce3+ to Eu2+ in LiSr4(BO3)(3):Ce3+, Eu2+ phosphors is dominant by electric dipole-dipole interaction, and the critical distance is calculated to be about 29.14 angstrom by the spectra overlap method. White light was observed from LiSr4(BO3)(3):mCe(3+), nEu(2+) phosphors with chromaticity coordinates (0.34. 0.30) upon 350 nm excitation. The LiSr4(BO3)(3):Ce3+, Eu2+ phosphor has potential applications as an UV radiation-converting phosphor for white light-emitting diodes. (C) 2011 Elsevier B.V. All rights reserved.