Zhao, B;
Lian, Y;
Cui, L;
Divitini, G;
Kusch, G;
Ruggeri, E;
Auras, F;
... Friend, RH; + view all
(2020)
Efficient light-emitting diodes from mixed-dimensional perovskites on a fluoride interface.
Nature Electronics
, 3
(11)
pp. 704-710.
10.1038/s41928-020-00487-4.
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Abstract
Light-emitting diodes based on halide perovskites have recently reached external quantum efficiencies of over 20%. However, the performance of visible perovskite light-emitting diodes has been hindered by non-radiative recombination losses and limited options for charge-transport materials that are compatible with perovskite deposition. Here, we report efficient, green electroluminescence from mixed-dimensional perovskites deposited on a thin (~1 nm) lithium fluoride layer on an organic semiconductor hole-transport layer. The highly polar dielectric interface acts as an effective template for forming high-quality bromide perovskites on otherwise incompatible hydrophobic charge-transport layers. The control of crystallinity and dimensionality of the perovskite layer is achieved by using tetraphenylphosphonium chloride as an additive, leading to external photoluminescence quantum efficiencies of around 65%. With this approach, we obtain light-emitting diodes with external quantum efficiencies of up to 19.1% at high brightness (>1,500 cd m−2).
| Type: | Article |
|---|---|
| Title: | Efficient light-emitting diodes from mixed-dimensional perovskites on a fluoride interface |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41928-020-00487-4 |
| Publisher version: | https://doi.org/10.1038/s41928-020-00487-4 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Design, synthesis and processing; Electrical and electronic engineering; Electronic devices; Electronics, photonics and device physics; Lasers, LEDs and light sources |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10136964 |
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