Realizing Highly\nStable Quasi-2D Blue Perovskite Light-Emitting\nDiodes Using Energy Cascades Generated by Biomolecule-Derived Plasmonic\nNanostructures

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