Quantification of Photon Recycling Effect in Perovskite Light-Emitting Diodes
Changsoon Cho a b c, Baodan Zhao a, Gregory Tainter a, Frederik Nehm b, Karl Leo b, Jung-Yong Lee c, Richard Friend a, Dawei Di a d, Felix Deschler a, Neil Greenham a
a Optoelectronics Group, Cavendish Laboratory, University of Cambridge, UK., J.J. Thomson Avenue, Cambridge, United Kingdom
b IAPP (Institut fuer Angewandte Photophysik),, TU Dresden, 01062, Dresden,
c Korea Advanced Institute of Science and Technology (KAIST), South Korea, Korea, Republic of
d Zhejiang University, No.148 Tianmushan Road, Hangzhou, 310028, China
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Oral, Changsoon Cho, presentation 016
Publication date: 25th November 2019

Along with the recent success in photovoltaics, perovskite light-emitting diodes (PeLEDs) are currently receiving great attention. While several groups are reporting high external quantum efficiencies (EQEs) over 20%, such high efficiencies deviate from the predictions using classical models used in the field of organic LEDs. Here, we present the role of photon recycling (PR), as a key to explain the discrepancy between the previous models and present efficiencies. The existence of a PR effect is verified by spatially-resolved photoluminescence (PL) and electroluminescence (EL). In addition, we quantify the practical contribution of PR to device efficiency through the investigation of optical modelling methods for re-absorbing emitters. It is shown that PR can contribute to >70% of light emission in the currently reported PeLEDs, and cause a non-linear relationship between external and internal quantum efficiencies. We also present a few photonic designs to further boost the efficiency with PR in the future.

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