Synthesis, energy transfer, charge compensation and luminescence properties of CaZrO3:Eu3+, Bi3+, Li+ phosphor

A series of CaZrO 3 :Bi 3+ , CaZrO 3 :Eu 3+ , CaZrO 3 :Eu 3+ , Bi 3+ , and CaZrO 3 :Eu 3+ , Bi 3+ , Li + phosphors are synthesized by high-temperature solid-state reaction method in air. Their luminescence properties are researched, compared, and analyzed. CaZrO 3 :Bi 3+ phosphor under excitation at 310 nm emits deep-blue light with chromaticity coordinate (0.1612, 0.0254). CaZrO 3 :Eu 3+ phosphor under excitation at 310 and 395 nm shows red-emitting with chromaticity coordinate (0.6386, 0.3611). CaZrO 3 :Eu 3+ , Bi 3+ phosphor under excitation at 310 nm exhibits a systematically varied hue from deep-blue to red light by changing Eu 3+ ion concentration, and that with excitation at 395 nm only emits red light with chromaticity coordinate (0.6386, 0.3611). The energy transfer process from Bi 3+ to Eu 3+ ions may be indicated by their spectral properties. The optimal Eu 3+ and Bi 3+ ions concentrations are 5 mol% and 0.9 mol%, respectively. The emission intensity CaZrO 3 :Eu 3+ , Bi 3+ phosphor may be enhanced about 1.6 times due to the co-doping Li + ion as charge compensator role. The luminous mechanism of CaZrO 3 :Eu 3+ , Bi 3+ phosphor is explained by the simplified energy level diagrams of Bi 3+ and Eu 3+ ions.