Abstract
Sr0.95Al2Si2O8:0.05Sm3+ and Sr0.95−xAl2Si2O8:0.05Sm3+/xLi+ phosphors were synthesized by a solid-state reaction. The phase, crystal structure and luminescent properties of the synthesized phosphors were investigated. All of the synthesized phosphors have a single phase, indicating that Sm3+ and Li+ ions have doped into the SrAl2Si2O8 hosts and formed solid solutions. Under the excitation at 405 nm, Sr0.95Al2Si2O8:0.05Sm3+ and Sr0.95−xAl2Si2O8:0.05Sm3+/xLi+ phosphors show emission bands resulting from the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 transitions of Sm3+. The codoped Li+ ions could enhance the emission intensity of Sm3+. Sr0.9Al2Si2O8:0.05Sm3+/0.05Li+ phosphor has a good thermal stability. The integral intensity at 225 °C is about 65% of the initial intensity at 25 °C.
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