Synthesis and luminescence enhancement of CaTiO3:Bi3+ yellow phosphor by codoping Al3+/B3+ ions

CaTiO 3 :Bi 3+ and CaTiO 3 :Bi 3+ , Al 3+ /B 3+ phosphors are synthesized by solid-state reaction method in air. With excitation 272 and 320 nm, broad PL band peaking at 555 nm with full width at half maximum ∼200 nm is observed in the range of 400–800 nm due to the 3 P 1,0  →  1 S 0 transitions of Bi 3+ ion. PLE spectrum monitored at 555 nm contains two PLE band peaking at ∼272 and 320 nm within the range 230–420 nm owing to metal-to-metal charge-transfer and 1 S 0  →  3 P 1 transition of Bi 3+ ion, respectively. The optimal Bi 3+ doping concentration in CaTiO 3 :Bi 3+ phosphor is about 0.5 mol%. Luminescence properties of CaTiO 3 :Bi 3+ phosphor may be improved obviously by co-doping Al 3+ /B 3+ ions, and its emission intensity can be enhanced 13–15 times after Al 3+ ion is co-doped. Luminous mechanism of CaTiO 3 :Bi 3+ phosphor is analyzed by energy level diagram of Bi 3+ ion. Decay curve and time-resolved spectra confirm that only a single type of Bi 3+ luminescence center exists in CaTiO 3 :Bi 3+ phosphor.