High-efficiency Mn2+-rich phosphors toward wide color gamut LCDs and advanced X-ray imaging applications

Abstract

The limitations of traditional phosphors, including low quantum efficiency, poor thermal stability, and limited adaptability to multimodal applications, hinder the advancement of multifunctional materials. Here, an excellent multifunctional BaMg_1.072Al_9.928O₁₇:Mn²⁺ (BMAO:Mn²⁺) green phosphor has been synthesized. The far distance between adjacent Mn emission centers (10.27 Å) effectively suppresses the concentration quenching effect and achieves a highly Mn²⁺-rich activated phosphor. BMAO:0.6Mn²⁺ exhibits a remarkably narrow full width at half maximum of only 26 nm and a high photoluminescence quantum yield of 94.9%. Furthermore, the highly rigid structure of the Mn²⁺ sites in the phosphor confers excellent thermal stability, and it retains 90% of its emission intensity when heated from 303 to 423 K. Notably, BMAO:0.6Mn²⁺ exhibits a color gamut covering 125.3% of the National Television System Committee (NTSC) standard and demonstrates advanced X-ray imaging capabilities, with a low detection limit of 35.8 nGy s⁻¹ and a high spatial resolution of 18.0 lp mm⁻¹. This work not only advances the application prospects of BMAO:Mn²⁺, but also provides valuable insights for designing future multifunctional materials.