The role of photon recycling in perovskite light-emitting diodes

Changsoon Cho, Baodan Zhao, Gregory D. Tainter, Jung-Yong Lee, Richard H. Friend, Dawei Di (), Felix Deschler () and Neil C. Greenham ()
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Changsoon Cho: University of Cambridge, J.J. Thomson Avenue
Baodan Zhao: University of Cambridge, J.J. Thomson Avenue
Gregory D. Tainter: University of Cambridge, J.J. Thomson Avenue
Jung-Yong Lee: Korea Advanced Institute of Science and Technology (KAIST)
Richard H. Friend: University of Cambridge, J.J. Thomson Avenue
Dawei Di: University of Cambridge, J.J. Thomson Avenue
Felix Deschler: University of Cambridge, J.J. Thomson Avenue
Neil C. Greenham: University of Cambridge, J.J. Thomson Avenue

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Perovskite light-emitting diodes have recently broken the 20% barrier for external quantum efficiency. These values cannot be explained with classical models for optical outcoupling. Here, we analyse the role of photon recycling (PR) in assisting light extraction from perovskite light-emitting diodes. Spatially-resolved photoluminescence and electroluminescence measurements combined with optical modelling show that repetitive re-absorption and re-emission of photons trapped in substrate and waveguide modes significantly enhance light extraction when the radiation efficiency is sufficiently high. In this manner, PR can contribute more than 70% to the overall emission, in agreement with recently-reported high efficiencies. While an outcoupling efficiency of 100% is theoretically possible with PR, parasitic absorption losses due to absorption from the electrodes are shown to limit practical efficiencies in current device architectures. To overcome the present limits, we propose a future configuration with a reduced injection electrode area to drive the efficiency toward 100%.

Date: 2020
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DOI: 10.1038/s41467-020-14401-1

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