Thermally activated delayed fluorescence with 7% external quantum efficiency from a light-emitting electrochemical cell.

ABSTRACT: We report on light-emitting electrochemical cells, comprising a solution-processed single-layer active material and air-stabile electrodes, that exhibit efficient and bright thermally activated delayed fluorescence. Our optimized devices delivers a luminance of 120 cd m^-2 at an external quantum efficiency of 7.0%. As such, it outperforms the combined luminance/efficiency state-of-the art for thermally activated delayed fluorescence light-emitting electrochemical cells by one order of magnitude. For this end, we employed a polymeric blend host for balanced electrochemical doping and electronic transport as well as uniform film formation, an optimized concentration (<1 mass%) of guest for complete host-to-guest energy transfer at minimized aggregation and efficient emission, and a

SUBMITTER: Lundberg P 

PROVIDER: S-EPMC6874610 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature