A novel red emitting phosphor CaIn2O4:Eu3+, Sm3+ with a broadened near-ultraviolet absorption band for solid-state lighting

Abstract Red phosphor of CaIn 2 O 4 :Eu 3+ , Sm 3+ is synthesized by solid state reaction. The 5 D 0 → 7 F 2 transition of Eu 3+ is dominantly observed in the photoluminescence spectrum, leading to a red emission of the phosphor. The doped Sm 3+ is found to be efficient to sensitize the emission of Eu 3+ and be effective to extend and strengthen the absorption of near-UV light with wavelength of 400–405 nm, and the energy transfer from Sm 3+ to Eu 3+ occurs and is discussed. The effect of the molar concentration of Sm 3+ on the emission intensities of the phosphor CaIn 2 O 4 :Eu 3+ , Sm 3+ is investigated. The temperature quenching effect is also measured from room temperature to 425 K, and the emission intensity of the phosphor at 425 K shows about 85% of that at room temperature. Furthermore, the chromaticity coordinates, the emission intensities and the conversion efficiencies of CaIn 2 O 4 :Eu 3+ , Sm 3+ are compared to those of the conventional red phosphor of Y 2 O 2 S:Eu 3+ .