Publication date: 2nd November 2020
Lead halide perovskites have been developed primarily for use in solar cells and now show remarkable levels of efficiency. One of the reasons for this excellent performance is that these materials can be strongly luminescent, showing unexpectedly low levels of non-radiative recombination, so that charge extraction can proceed at high cell voltages without significant recombination losses. This high luminescence yield can be exploited in LEDs. Light-emitting diodes based on halide perovskites have recently reached external quantum efficiencies of over 20 percent. I will review the factors that control the performance of perovskite LEDs, including the management of non-radiative recombination losses and selection of charge-transport layers that are compatible with perovskite deposition. One of the recent developments that has advanced the level of performance is the use of mixed two-dimensional and three-dimensional pervoskites, which allow very high luminescence yields from the three-dimensional phases.
(1) Zhao, B.; Lian, Y.; Cui, L.; Divitini, G.; Kusch, G.; Ruggeri, E.; Auras, F.; Li, W.; Yang, D.; Zhu, B.; Oliver, R. A.; MacManus-Driscoll, J. L.; Stranks, S. D.; Di, D.; Friend, R. H. Efficient Light-Emitting Diodes from Mixed-Dimensional Perovskites on a Fluoride Interface. Nat. Electron. 2020. https://doi.org/10.1038/s41928-020-00487-4.
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