Design rules for light-emitting electrochemical cells delivering bright luminance at 27.5 percent external quantum efficiency.

ABSTRACT: The light-emitting electrochemical cell promises cost-efficient, large-area emissive applications, as its characteristic in-situ doping enables use of air-stabile electrodes and a solution-processed single-layer active material. However, mutual exclusion of high efficiency and high brightness has proven a seemingly fundamental problem. Here we present a generic approach that overcomes this critical issue, and report on devices equipped with air-stabile electrodes and outcoupling structure that deliver a record-high efficiency of 99.2 cd A^-1 at a bright luminance of 1910 cd m^-2. This device significantly outperforms the corresponding optimized organic light-emitting diode despite the latter employing calcium as the cathode. The key to this achievement is the design of

SUBMITTER: Tang S 

PROVIDER: S-EPMC5662711 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature