Enhanced Quantum Efficiency via Co‐Substitution in Red‐Emitting Phosphor Sr2[MgAl5N7] : Eu2+ for Advanced Spectroscopic Applications Including Laser Displays with Ultra‐High Luminescence Saturation Threshold - Li, Zebin; Wang, Haoyang; Su, Zhezhe; Kang, Runtian; Seto, Takatoshi; Wang, Yuhua (Angewandte Chemie International Edition, 2025)