Perovskite Transport Layers for Light-Emitting Electrochemical Cells
Lorenzo Pietro Mardegan a, Bas Huisman a, Georgiana Malin a b, Michele Sessolo a, Henk Bolink a
a Istituto de Cienca Molecular (ICMol), Universidad de Valencia, C/Catedratico J. Beltran 2, 46980 Paterna (Valencia), Spain.
b Department of Chemistry, Imperial College London, South Kensington Campus London, London, United Kingdom
Poster, Lorenzo Pietro Mardegan, 106
Publication date: 25th November 2019

Organic-inorganic metal halide perovskites have drawn considerable attention due to their outstanding performance as semiconductors in solar cells and light-emitting diodes. [lm1] Besides their use as the active layer in such devices, the relatively high charge mobility can be exploited using perovskites as thick transport layers in organic optoelectronics. This new application is still rather unexplored, and limited to vacuum deposited multilayer devices. Light-emitting electrochemical cells are unconventional light-emitting devices based on a single organic semiconducting layer. The presence of mobile ions in the active materials assist charge injection and transport, allowing for a simple device architecture. In this work we present a proof of concept demonstration of perovskite films operating as charge transport layers in combination with light-emitting electrochemical cells. We combined the inorganic wide band gap perovskite CsPbBr3 with polymer semiconductors such as Super Yellow or Red F and studied the device lifetime and luminous efficiency at different current density and for various device layout. Photophysical measurements [lm2] have been carried out in order to establish whether the perovskite layer contributes to the electroluminescence or provides non-radiative deactivation paths. Finally, the performance of the device has been optimized by varying the thickness of the perovskite hole transport layer and of the polymer film.

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