High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes
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Zhao, B., Bai, S., Kim, V., Lamboll, R., Shivanna, R., Auras, F., Richter, J., et al. (2018). High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes. Nature Photonics, 12 (12), 783-789. https://doi.org/10.1038/s41566-018-0283-4
Perovskite-based optoelectronic devices are gaining much attention owing to their remarkable performance and low processing cost, particularly for solar cells. However, for perovskite light-emitting diodes, non-radiative charge recombination has limited the electroluminescence efficiency. Here we demonstrate perovskite–polymer bulk heterostructure light-emitting diodes exhibiting external quantum efficiencies of up to 20.1% (at current densities of 0.1–1 mA cm−2). The light-emitting diode emissive layer comprises quasi-two-dimensional and three-dimensional (2D/3D) perovskites and an insulating polymer. Photogenerated excitations migrate from quasi-2D to lower-energy sites within 1 ps, followed by radiative bimolecular recombination in the 3D regions. From near-unity external photoluminescence quantum efficiencies and transient kinetics of the emissive layer with and without charge-transport contacts, we find non-radiative recombination pathways to be effectively eliminated, consistent with optical models giving near 100% internal quantum efficiencies. Although the device brightness and stability (T50 = 46 h in air at peak external quantum efficiency) require further improvement, our results indicate the significant potential of perovskite-based photon sources.
ECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (670405)
External DOI: https://doi.org/10.1038/s41566-018-0283-4
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286147