Synthesis and luminescence of Sr₃Al₂O₆:Ce³⁺ powders synthesized by solid state reaction method with addition of H₃BO₃

Abstract

Sr₃Al₂O₆:Ce³⁺ powders were synthesized using a solid state reaction method in air with addition of H₃BO₃. The effects of Ce³⁺ dopant concentrations and the weight ratio (wt) of H₃BO₃ to total raw materials weight on the formation of Sr₃Al₂O₆:Ce³⁺ samples were investigated. Single-phase and well-crystallized Sr₃Al₂O₆:Ce³⁺ samples can be obtained when the addition of H₃BO₃ is lower than 7 wt%. The excitation spectrum indicates that Sr₃Al₂O₆:Ce³⁺ phosphor powders exhibit two excitation bands centered at 345 and 462 nm. The emission spectrum shows that Sr₃Al₂O₆:Ce³⁺ phosphor powders exhibit an emission band peaked at 536 nm when excited at 462 nm. Sr₃Al₂O₆:Ce³⁺ sample at the Ce³⁺ concentration of 5 mol% shows the strongest emission intensity. The addition of H₃BO₃ has obvious influence on phase and emission intensity of Sr₃Al₂O₆:Ce³⁺ phosphors. The results show that the Sr_2.95Ce_0.05Al₂O₆ sample with the 7 wt% addition of H₃BO₃ has the highest emission intensity and the longest lifetime.