Photoluminescence properties of (Sr1−xCax)1−yZrO3:yEu3+ phosphors for near-ultraviolet excited LEDs

Abstract

Abstract Red-emitting (Sr 1− x Ca x ) 1− y ZrO 3 : y Eu 3+ (0≤ x ≤1.0 and 0.01≤ y ≤0.1) phosphors are synthesized by a modified solid-state reaction. The crystal structure and photoluminescence properties of the (Sr 1− x Ca x ) 1− y ZrO 3 : y Eu 3+ are studied, depending on Ca 2+ and Eu 3+ contents. The emission peak (614 nm) from the 5 D 0 → 7 F 2 transition is much stronger than that (592 nm) from the 5 D 0 → 7 F 1 transition, indicating efficient red emission. The substitution of Ca 2+ for Sr 2+ in Sr 0.95 ZrO 3 :0.05Eu 3+ greatly enhances the excitation and emission intensities. The most efficient red emission is obtained for the Ca 0.95 ZrO 3 :0.05Eu phosphor. The Ca 0.95 ZrO 3 :0.05Eu 3+ phosphor is a strong candidate as a red component for phosphor-converted white LEDs.