Record‐High Performance Hyperfluorescent OLEDs Achieved via Electronic Structure Control of Chlorine‐Diversified MR‐TADF Emitters. - Lee, Taehwan; Ochi, Junki; Uemura, Shigetada; Liu, Feiran; Hao, Jiping; Kondo, Yasuhiro; Hayakawa, Masahiro; Hatakeyama, Takuji (Advanced Science, 2026)