Luminescent properties of orange-emitting long-lasting phosphorescence phosphor Ca2SnO4:Sm3+

A new long-lasting phosphorescence phosphor, Ca2SnO4:Sm3+, which emits orange light upon UV-excitation, has been successfully obtained by a conventional high-temperature solid-state reaction method. Its properties have been characterized and analyzed by utilizing x-ray diffraction, photoluminescence, excited-state decay curve and long-lasting phosphorescence decay curve. After irradiation with 252-nm ultraviolet light, Ca2SnO4:Sm3+ emits intense orange afterglow originating from the 4G5/2 to 6HJ (J = 5/2,7/2,9/2) transitions. The afterglow decay curve of the Sm3+-doped Ca2SnO4 phosphor indicates both fast and slow decay components. Due to the presence of the latter one, the afterglow can be clearly observed with the naked eyes in the dark for more than 1 h after. The possible mechanism of this long-lasting phosphorescence has also been discussed based on the experimental results.

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