Hydrogen-bonded cation-composition-engineered color-stable blue PeLEDs

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Perovskite light-emitting diodes (PeLEDs) have been considered to be the most promising candidate for solid-state lighting and high-definition full-color display due to their attractive properties such as tunable emission wavelengths,narrow full width at half maximum (FWHM),and high photoluminescence quantum yield(PLQY) [1-3].The external quantum efficiencies (EQEs) of green-and red-emitting PeLEDs have exceeded 20% rocketing toward the theoretical limit [4,5],but the blue PeLEDs still suffer from the obstacles of low efficiency and poor operational stability,which largely overshadows their real applications and industrial-scale adoption.
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