Novel orange-red emitting Sm3+-doped Bi4Sr3Te5O19 phosphors with high color purity for white light-emitting diodes

Abstract

Novel Sm3+-doped tellurate Bi4Sr3Te5O19 phosphors have been prepared through the solid-state reaction for the first time. The powder phase purity, particle morphology, and luminescence properties are analyzed in detail. Under the 405 nm excitation, the Bi4Sr3Te5O19:Sm3+ phosphors show orange-red emission with four typical peaks. The optimal doping concentration of Bi4Sr3Te5O19:xSm3+ is found at x = 0.02 mol and the critical transfer distance (Rc) is 21.08 A. The color purity of Bi4Sr3Te5O19:Sm3+ phosphors are as high as 99.9%. The commission international de l'Eclairage (CIE) color coordinates are in the orange-red region. Temperature-related photoluminescence spectra and the corresponding CIE color coordinates indicate the phosphors possess good thermal stability and stable color property. Besides, the internal quantum efficiency (IQE) of the Bi4Sr3Te5O19:0.02Sm3+ phosphor reached 17.23%. Thus, Bi4Sr3Te5O19:Sm3+ phosphors have great potential applications in abundant lighting and displays.