Effect of different RE dopants on phosphorescence properties of Sr2Al2SiO7:Eu2+ phosphors

Different rare earth (RE) ions dopants were added into the SrAl2SiO7:Eu2+ phosphors in order to enhance the phosphorescence properties, and the effect of the RE ions including Yb3+, Ce3+, Nd3+, Dy3+ and Tm3+, was comparatively investigated. It was found that Nd3+ addition improved the phosphorescence properties obviously among all the studied RE ions. Therefore, Sr1.96–xAl2SiO7:xEu2+,yNd3+ phosphors were studied in detail, and the optimum Eu2+ and Nd3+ concentrations were determined with the afterglow time of about 20 min. The phase structures, photoluminescence (PL) properties, long-lasting phosphorescence (LLP) properties, afterglow decay curves and thermo-luminescence (TL) for the selected phosphors during the corresponding study were investigated. All the phosphors exhibited green PL emission and LLP emission. There were two TL bands located at about 325 and 380 K for the studied samples, and the relationship between RE addition and phosphorescence properties was discussed.

Comparison of the afterglow spectra for Sr1.96Al2SiO7:0.04Eu2+ and Sr1.92Al2SiO7:0.04Eu2+, 0.04RE3+ (RE=Yb, Ce, Nd, Dy, Tm) phosphorsFigure optionsDownload as PowerPoint slide