Design rules for light-emitting electrochemical cells delivering bright luminance at 27.5 percent external quantum efficiency
| Autor: | Martijn Kemerink, Andreas Sandström, Petter Lundberg, Shi Tang, Thomas Lanz, Christian Larsen, Stephan van Reenen, Ludvig Edman |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Other Physics Topics Science General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Luminance General Biochemistry Genetics and Molecular Biology Article Electrochemical cell OLED Electronic devices Electronics Organic LEDs lcsh:Science Author Correction Multidisciplinary business.industry Doping Annan fysik General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electrode Optoelectronics lcsh:Q Quantum efficiency 0210 nano-technology business Den kondenserade materiens fysik |
| Zdroj: | Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | 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 the host–guest active material, in which tailored traps suppress exciton diffusion and quenching in the central recombination zone, allowing efficient triplet emission. Simultaneously, the traps do not significantly hamper electron and hole transport, as essentially all traps in the transport regions are filled by doping. Cost-efficient light-emitting electrochemical cells can deliver unique functions, but suffer because strong brightness has only been obtained at modest efficiency. Tang et al. report on rationally designed devices that are both bright and efficient, thus representing a major step towards commercialization. |
| Databáze: | OpenAIRE |
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