Tunable white light emission of rare earth ions doped single matrix SrAl₂Si₂O₈ phosphors

Aluminosilicate phosphors have been successfully applied in laser technology and fluorescent lamps due to their high luminescence properties and excellent chemical stability. Consequently, research on novel aluminosilicate phosphors has a good application prospect. Rare earth (RE) ions doped SrAl₂Si₂O₈ phosphors were prepared by solid-phase method. Excited at 350 nm, the phosphor doped with Dy³⁺ ions emits a blue light peaking at 482 nm and an orange light peaking at 575 nm, respectively, and its optimum doping concentration is 0.8 at.%. At the NUV excitation of 377 nm, the phosphor doped with Tb³⁺ ions shows emission peaks at 489 nm, 544 nm, 585 nm and 623 nm, and the luminescence intensity is the strongest when the content of Tb³⁺ is 9 at.%. The concentration quenching mechanism of Dy³⁺ and Tb³⁺ RE ions is the electric dipole–dipole interaction. For SrAl₂Si₂O₈:Tb³⁺, Sm³⁺ phosphors, the energy transfer efficiency is 85.4%, and the mechanism is electric dipole–quadrupole interaction. For SrAl₂Si₂O₈:Dy³⁺ and SrAl₂Si₂O₈:Tb³⁺, Sm³⁺ phosphors, the best CIE coordinates are (0.275, 0.308), (0.316, 0.386). The consequences display that RE ions doped single matrix SrAl₂Si₂O₈ phosphors can achieve effective white light emission and have high application value in white LEDs.