Efficient light-emitting diodes from mixed-dimensional perovskites on a fluoride interface
Accepted version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Abstract
© 2020, The Author(s), under exclusive licence to Springer Nature Limited. 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).
Description
Keywords
Journal Title
Conference Name
Journal ISSN
2520-1131
Volume Title
Publisher
Publisher DOI
Rights
Sponsorship
Engineering and Physical Sciences Research Council (EP/L011700/1)
Engineering and Physical Sciences Research Council (EP/N004272/1)
European Research Council (670405)
European Research Council (756962)
European Commission Horizon 2020 (H2020) Research Infrastructures (RI) (823717)