Intramolecular Hydrogen Bonding Enables 5.9% External Quantum Efficiency in Radical-Based Near-Infrared Organic Light-Emitting Diodes with Emission beyond 850 nm - Minzhe Zhang; You-Jun Yu; Zenghui Dai; Wenzhao Wang; Houyu Zhang; Ming Zhang; Feng Li (Journal of the American Chemical Society, 2025)