LAUSR

SrB2Si2O8: Eu2+/Ce3+ co-doped phosphors were synthesized via conventional high temperature solid state reaction method. The best rare earth doping SrB2Si2O8 phosphors were obtained at 950 °C for 6 h. For SrB2Si2O8: Eu2+, a large broad band locating at 440 nm corresponding to the 4f65d-4f7 (8S7/2) transition. The optimal concentration of Eu2+ is 8 at.%, its concentration quenching is due to dipole–dipole interaction. Under UV excitation of 320 nm, SrB2Si2O8: Ce3+ phosphor demonstrates a strong emission peak located at 373 nm. By Gaussian fitting, the emission of the sample peaking at 367 nm (27223 cm−1) and 396 nm (25270 cm−1) corresponding to the transition 5d–4f (2F5/2) and 5d–4f (2F7/2), respectively, the best doping concentration of Ce3+ is 0.6 at.%. Simultaneously, a series of Sr1−xB2Si2O8: xEu2+, Ce3+ phosphors were studied, results indicating that the emission intensity of Ce3+ ions decreases with the increasing of Eu2+ concentration, when the doping concentration of Eu2+ reaches 1.0 at.%, the emitting intensity is 2.1 times higher than that of the single doped Eu2+. The energy transfer efficiency among Ce3+ and Eu2+ ions is calculated to be as high as 93.4%, which is caused by the dipole–dipole resonant type from Ce3+ to Eu2+.