High-Performance Light-Emitting Electrochemical Cells by Electrolyte Design

Polymer light-emitting electrochemical cells (LECs) are inherently dependent on a suitable electrolyte for proper function. Here, we design and synthesize a series of alkyl carbonate-capped star-branched oligoether-based electrolytes with large electrochemical stability windows, facile ion release, and high compatibility with common light-emitting materials. LECs based on such designed electrolytes feature fast turn-on, a long operational lifetime of 1400 h at >100 cd m –2 and a record-high power conversion efficiency of 18.1 lm W –1, when equipped with an external outcoupling film.