Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
DOI: https://doi.org/10.29363/nanoge.nipho.2020.016
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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