Luminescence of Eu~(2+) in Sr_2Al_6O_(11)-Based Phosphor

The effects of different doping concentration of Eu2+ on the properties of Sr2Al6O11-based phosphor were studied. The results indicate that there are two main emission peaks at 403nm and 493nm existing in the phosphor, while the doping concentration of Eu2+ is below 0.01mol, which are corresponding to various Sri and Sr2 sites in the Sr2Al6O11 matrix. While increasing the doping concentration of Eu2+, the emission peak of 403nm disappears and the peak of 493nm becomes strong simultaneously due to the energy transfer between the different Eu2+ centers. Decay curves imply that the phosphor without co-doping Dy3+ has no long afterglow properties. When the doping concentration of Eu2+ is 0.01mol, the long afterglow is the best in three experimental samples with different Eu2+ contents. The luminescent properties will decrease while increasing the doping concentration of Eu2+ due to the concentration quenching.