In this paper,we report on long-persistence white phosphor SrAl2Si2O8:Eu2+,Dy3+ synthesized by the sol-gel method.The luminescent materials prepared by the sol-gel method have many advantages,such as uniform compositi...In this paper,we report on long-persistence white phosphor SrAl2Si2O8:Eu2+,Dy3+ synthesized by the sol-gel method.The luminescent materials prepared by the sol-gel method have many advantages,such as uniform composition,high purity,fine grains and low synthesis temperature.We found that SrAl2Si2O8:Eu2+,Dy3+ phosphor prepared by the sol-gel method can provide more luminescent intensity and better afterglow characteristic compared with the same phosphor prepared by solid-state method.Namely,the particle size and shape of phosphors should be optimized to obtain the maximum quantum efficiency through energy absorption.The microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1 μm.Under 356 nm light excitation,the broadband emission of the phosphor continues from 350 to 650 nm and the emission peak is at about 414 nm,which can be viewed as the typical emission of Eu2+ ascribed to the 4f→5d transitions.展开更多
文摘In this paper,we report on long-persistence white phosphor SrAl2Si2O8:Eu2+,Dy3+ synthesized by the sol-gel method.The luminescent materials prepared by the sol-gel method have many advantages,such as uniform composition,high purity,fine grains and low synthesis temperature.We found that SrAl2Si2O8:Eu2+,Dy3+ phosphor prepared by the sol-gel method can provide more luminescent intensity and better afterglow characteristic compared with the same phosphor prepared by solid-state method.Namely,the particle size and shape of phosphors should be optimized to obtain the maximum quantum efficiency through energy absorption.The microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1 μm.Under 356 nm light excitation,the broadband emission of the phosphor continues from 350 to 650 nm and the emission peak is at about 414 nm,which can be viewed as the typical emission of Eu2+ ascribed to the 4f→5d transitions.
