Introducing Eu2+ into yellow phosphor LiBaB9O15:Ce3+, Dy3+ as blue emitting source to realize white emission

Abstract A series of Dy 3+ , Ce 3+ /Dy 3+ , Eu 2+ /Dy 3+ and Ce 3+ /Eu 2+ /Dy 3+ doping LiBaB 9 O 15 (LBB) phosphors were synthesized via a high temperature solid-state method. LBB:Dy 3+ cannot create light under ultraviolet radiation, however, LBB:Ce 3+ , Dy 3+ can produce yellow emission under 295 nm excitation. The energy transfer occurs from Ce 3+ to Dy 3+ ions via electric dipole-dipole interaction and the critical distance is estimated to be 21.15 A based on concentration quenching model. Generally, Eu 2+ ion is a sensitizer to Dy 3+ ion, however, there is only the emission of Eu 2+ in LBB:Eu 2+ , Dy 3+ , which means there is no energy transfer from Eu 2+ to Dy 3+ ions. Interestingly enough, when doping Eu 2+ ion into LBB:Ce 3+ , Dy 3+ , white emission can be achieved by increase the blue (350–425 nm) emission intensity. The spectral property, quantum efficiency, CIE chromaticity coordinates and thermal quenching property of LBB:Ce 3+ , Eu 2+ , Dy 3+ are investigated. The results indicate that LBB:Ce 3+ , Eu 2+ , Dy 3+ may be a potential application to white light emitting diodes.