A blue-green-emitting phosphor Na_2Ca_3Si_2O_8:Tb~(3+) with tunable emission color manipulated by cross-relaxation

摘要

The blue-green-emitting Na_2Ca_3Si_2O_8:Tb~(3+) phosphors were prepared successfully via a traditional high temperature solid-state reaction method. The crystal phase was checked by XRD. The dependence of photolumines-cence excitation, photoluminescence and fluorescence decay properties on Tb~(3+) doping concentration was studied in detail. The emission color can be modified from blue to green based on cross-relaxation through tuning the doping concentration of Tb~(3+) ions. The cross-relaxation from ~5D_3 to ~5D_4 state which was investigated by spectroscopic and dynamic measurements was also illustrated with an energy level scheme. It may be a good candidate for blue and green phosphor.