Abstract
Abstract Sm 3+ -activated La 2 O 2 S phosphors with good crystallinity were prepared by solid-state reaction. The formation mechanism of La 2 O 2 S formation was assumed and the phase change with different temperatures was discussed. The luminescence properties of phosphors with different sintering temperatures and different doping concentrations of Sm 3+ were investigated. The emission peak at 605 nm showed a well intensity can be attributed to the 4 G 5/2 → 6 H 7/2 transition of Sm 3+ . The optical absorption of La 2 O 2 S phosphors showed a stronger intensity in UV–vis region comparing with the Y 2 O 2 S phosphors. The long afterglow properties were investigated after the phosphors were excited with a fluorescent lamp. Phosphorescence lasted for about 3 min in the limit of light perception of the dark-adapted human eye (0.32 mcdm −2 ).
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