Synthesis and luminescence properties of CaSnO3:Bi3+ blue phosphor and the emission improvement by Li+ ion

CaSnO₃:Bi³⁺ blue‐emitting phosphor was synthesized using a high‐temperature solid‐state reaction method in air. The crystal structures and luminescence properties were investigated. A broad emission band peaking at ~448 nm upon excitation at 262 and 308 nm was observed in the range 330–680 nm at room temperature due to ³P₁ → ¹S₀ transition of the Bi³⁺ ion. The chromaticity coordinate was (0.1786, 0.1665). The optimal Bi³⁺ ion concentration was ~0.6 mol% in CaSnO₃:Bi³⁺ phosphor. The emission spectrum of CaSnO₃:Bi³⁺ phosphor showed a blue‐shift with increasing temperature from 50 to 300 K due to the influence of temperature on the electron transition of the Bi³⁺ ion. The emission intensity of CaSnO₃:Bi³⁺ phosphor may be increased ~1.45 times by co‐doping Li⁺ ions as a charge compensator and fluxing agent. The luminescence mechanism is explained by a configurational coordinate diagram of Bi³⁺ ion in CaSnO₃:Bi³⁺ phosphor.