We report efficient and colour-stable PeLEDs across the entire pure-red region, with a peak external quantum efficiency reaching 28.7% at 638 nm, enabled by incorporating a double-end anchored ligand molecule into pure-iodine perovskites.
The organic intercalating cation stabilizes the lead iodine octahedron through coordination with exposed lead ions and enhanced hydrogen bonding with iodine, facilitating spectral modulation, promoting charge transfer between perovskite quantum wells, and reducing iodine migration under electrical bias.
Continuously tunable emission wavelengths for iodine-based perovskite films were achieved with suppressed energy loss due to the decrease in bond energy of lead iodine in ionic perovskites as the bandgap increases.
Resultant devices exhibit outstanding spectral stability and a half-lifetime of more than 7,600 min at an initial luminance of 100 cd m-2.
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