Abstract
The long afterglow phosphors Sr 1.97MgSi 2O 7: Eu 0.01 2+, Dy 0.02− x 3+, Nd x 3+ ( x = 0, 0.01, 0.02) and Sr 1.99MgSi 2O 7: Eu 0.01 2+ were prepared by the high-temperature solid state reaction. The doping Dy 3+ or Nd 3+ has no influence on both the crystal phase and the emission peak. The afterglow of the Sr 2MgSi 2O 7: Eu 2+ is obtained. With the increase of the substitution of Nd 3+ for Dy 3+, the decay constants of the afterglow decrease. The thermoluminescence curves of the samples which imply the decline of the trap depth correspond to this phenomenon. The increase of the density of the traps and the decline of the trap depth may be due to the introduction of cation vacancies. The substitution of Nd 3+ for Dy 3+ also causes decline of the trap depth for the influence of the disturbances in the crystal decreases.
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