Abstract
Eu 3+-doped Ca 2SnO 4 (solid solutions of Ca 2− x Eu 2 x Sn 1− x O 4, 0⩽ x⩽0.3) and Eu 3+ and Y 3+-codoped Ca 2SnO 4 (Ca 1.8Y 0.2Eu 0.2Sn 0.8O 4) were prepared by solid-state reaction at 1400 °C in air. Rietveld analysis of the X-ray powder diffraction patterns revealed that Eu 3+ replaced Ca 2+ and Sn 4+ in Eu 3+-doped Ca 2SnO 4, and that Eu 3+ replaced Ca 2+ and Y 3+ replaced Sn 4+ in Ca 1.8Y 0.2Eu 0.2Sn 0.8O 4. Red luminescence at 616 nm due to the electric dipole transition 5 D o→ 7 F 2 was observed in the photoluminescence (PL) spectra of Ca 2− x Eu 2 x Sn 1− x O 4 and Ca 1.8Y 0.2Eu 0.2Sn 0.8O 4 at room temperature. The maximum PL intensity in the solid solutions of Ca 2− x Eu 2 x Sn 1− x O 4 was obtained for x=0.1. The PL intensity of Ca 1.8Y 0.2Eu 0.2Sn 0.8O 4 was 1.26 times greater than that of Ca 2− x Eu 2 x Sn 1− x O 4 with x=0.1.
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