Ultrabroadband (Vis‐NIR) Emission in Single‐Component Perovskite LEDs via Tailored Multi‐Exciton Energy Transfer Pathways

⁺ co-doped NCs delivers broadband emission extending to ≈1200 nm, high spectral quality (CRI ∼ 98.1, R9 ∼ 98), strong visible/NIR PLQY (≈80%), and steady operation over 50 h. The findings provide insight into energy transfer engineering in low-dimensional perovskites and offer a viable route toward emerging ultrabroadband solid-state light sources.