A novel high thermal stability Ce3+-doped Ca5(SiO4)2F2 blue-emitting phosphor for near UV-excited white light-emitting diodes

Abstract A novel high thermal stability Ca 5 (SiO 4 ) 2 F 2 :Ce 3+ ,Na + blue-emitting phosphor was synthesized by solid-state reaction. The excitation spectrum shows a broad band extending from 200 nm to 390 nm, and the emission spectrum shows a broad blue band peaking at 408 nm with a half width of approximately 75 nm. The optimum doping concentration of Ce 3+ is found to be 8 mol%. Its luminescence intensity at 420 K still kept by approximately 86% of the initial value at room temperature. The calculated CIE coordinates indicate that the phosphor has good color purity. Given their broadband absorption from 250 nm to 390 nm, these phosphors meet the application requirements for GaN-based light-emitting diodes.