Thermally stable luminescence properties and energy transfer of green-emitting LiBaPO₄: Tb³⁺, Ce³⁺ Phosphor

Green emitting LiBa_1−x-yPO4: xTb³⁺,yCe³⁺ phosphors have been synthesized by solid state reaction method and investigated by means of microstructure, photoluminescence, and temperature dependence of luminescence property. Effective energy transfer occurs from Ce³⁺ to Tb³⁺ in LiBaPO₄ host due to the observed spectral overlap between the emission band of Ce³⁺ and the excitation band of Tb³⁺. We have also shown that the energy transfer from Ce³⁺ and Tb³⁺ in LiBaPO₄ host was demonstrated to be resonant type via a dipole-dipole interaction mechanism with the energy transfer critical distance of 0.9077 nm. Furthermore, LiBa_0.75PO₄:0.2Tb³⁺,0.05Ce³⁺ phosphor shows high thermally stable luminescence comparable to commercial phosphor YAG:Ce³⁺. All the characteristics suggest that LiBaPO₄:Tb³⁺,Ce³⁺ is a good green phosphor candidate for creating white light in phosphor-conversion WLED.