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High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes
Open accessAbstract
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. Near-infrared perovskite–polymer light-emitting diodes (LEDs) with external quantum efficiencies of up to 20.1% are reported.
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Cited by
Metal halide perovskites for light-emitting diodes
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Metadata
- Authors
- Zhao, B., Bai, S., Kim, V., Lamboll, R., Shivanna, R., Auras, F., Richter, J. M., Yang, L., Dai, L., Alsari, M., She, X.-J., Liang, L., Zhang, J., Lilliu, S., Gao, P., Snaith, H. J., Wang, J., Greenham, N. C., Friend, R. H., & Di, D.
- Venue
- Nature Photonics
- Published
- 2018-11-05
- Volume
- 12
- Issue
- 12
- Pages
- 783-789
- ISSN
- 1749-4885 (ISSN-L)
- 1749-4893
- OpenAlex
- W2798854189
- Cited by
- 886
- References
- 41
- FWCI
- 44.69
- Type
- journal article
- Language
- en
- Open access
- green
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- Zhao, B., Bai, S., Kim, V., Lamboll, R., Shivanna, R., Auras, F., Richter, J. M., Yang, L., Dai, L., Alsari, M., She, X.-J., Liang, L., Zhang, J., Lilliu, S., Gao, P., Snaith, H. J., Wang, J., Greenham, N. C., Friend, R. H., & Di, D. (2018). High-efficiency perovskite–polymer bulk heterostructure light-emitting diodes. Nature Photonics. https://doi.org/10.1038/s41566-018-0283-4
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