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

Petter Lundberg, Youichi Tsuchiya, E. Mattias Lindh, Shi Tang, Chihaya Adachi, Ludvig Edman

Research output: Contribution to journalArticle

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 an appropriate concentration of an electrochemically stabile electrolyte for desired doping effects. The generic nature of our approach is manifested in the attainment of bright and efficient thermally activated delayed fluorescence emission from three different light-emitting electrochemical cells with invariant host:guest:electrolyte number ratio.

Original languageEnglish
Article number5307
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - Dec 1 2019

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Electrochemical cells
electrochemical cells
Quantum efficiency
quantum efficiency
Fluorescence
luminance
Light
fluorescence
Electrolytes
Luminance
Doping (additives)
electrolytes
Energy Transfer
Energy transfer
Electrodes
Agglomeration
energy transfer
Air
Equipment and Supplies
electrodes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Thermally activated delayed fluorescence with 7% external quantum efficiency from a light-emitting electrochemical cell. / Lundberg, Petter; Tsuchiya, Youichi; Lindh, E. Mattias; Tang, Shi; Adachi, Chihaya; Edman, Ludvig.

In: Nature communications, Vol. 10, No. 1, 5307, 01.12.2019.

Research output: Contribution to journalArticle

Lundberg, Petter ; Tsuchiya, Youichi ; Lindh, E. Mattias ; Tang, Shi ; Adachi, Chihaya ; Edman, Ludvig. / Thermally activated delayed fluorescence with 7% external quantum efficiency from a light-emitting electrochemical cell. In: Nature communications. 2019 ; Vol. 10, No. 1.
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