A novel blue-emitting Ce3+-doped Sr5(BO3)3Cl phosphor for near UV-excited white light-emitting diodes

A novel blue-emitting Sr5(BO3)3Cl:Ce3+,Na+ phosphor was synthesized by solid-state reaction. The excitation spectrum shows a broad band extending from 200 nm to 400 nm, and the emission spectrum shows a broad blue band peaking at 414 nm with a half width of approximately 70 nm. The optimum doping concentration of Ce3+ is found to be 0.7%. The quenching temperature for Sr5(BO3)3Cl:Ce3+,Na+ is 416 K. The calculated CIE coordinates indicate that the phosphor has good color purity. Given their broadband absorption from 250 nm to 400 nm, these phosphors meet the application requirements for GaN-based light-emitting diodes.