Synthesis and luminescence properties of LiBaPO4:Bi3+ yellow-emitting phosphor for solid-state lighting

Novel LiBaPO 4 :Bi 3+ yellow-emitting phosphor is synthesized by high temperature solid-state reaction method in air. With excitation 260 nm, LiBaPO 4 :Bi 3+ phosphor emits yellow light with the chromaticity coordinate (0.4272, 0.4657) and color rendering index 77.7. Emission band peaking at ~ 588 nm of LiBaPO 4 :Bi 3+ phosphor in the range of 400–790 nm is attributed to the 3 P 1 → 1 S 0 electron transition of Bi 3+ ion. Excitation band monitored at 588 nm in the range of 220–300 nm is assigned to the 1 S 0 → 3 P 1 electron transition of Bi 3+ ion. The optimal Bi 3+ ion concentration in LiBaPO 4 :Bi 3+ phosphor is ~ 1.0 mol%. Time resolved spectra and fluorescence lifetime data confirm that there is only Bi 3+ ion luminous center in LiBaPO 4 :Bi 3+ phosphor. The luminous mechanism is analyzed by configurational coordinate diagram of Bi 3+ ion. The experiment results are helpful to develop other new Bi 3+ -doped optical materials for solid-state lighting.