Realizing Highly Stable Quasi-2D Blue Perovskite Light-Emitting Diodes Using Energy Cascades Generated by Biomolecule-Derived Plasmonic Nanostructures

Blue perovskite light-emitting diodes (LEDs) lag behind green and red LEDs, which have made considerable strides in efficiency and stability. The main disadvantage is its unmodulated phase domains and low energy transfer efficiency, which impede the efficiency, optical purity, and operational stability of the devices. Herein, we show that using biomolecule-derived plasmonic nanostructures can significantly promote defect passivation, van der Waals gap reduction, and cascade energy transfer through synergistic small-molecule interactions and localized surface plasmonic contributions, thereby improving the electroluminescence (EL) properties and operational stability. The designed blue quasi-2D perovskite LED benefits from the synergistic effect with a higher external quantum efficiency (EQE = 3.51%), EL spectral stability, and superior long-term operational stability. These results validate the optimization of structural and energy cascades of quasi-2D perovskites through a simple and environmentally friendly biomolecular tailorable plasmonic nanostructure approach, paving the way for the development of sustainable electronics.