Year: 2024
Type: article
Abstract: Perovskite light‐emitting diodes (PeLEDs) have recently experienced rapid growth in performance. While photon recycling, which involves the reemission of reabsorbed light, significantly boosts efficiency, PeLED structures are typically based on classical design principles, often overlooking photon recycling. Here, a practical strategy to maximize the benefit of the photon recycling effect in PeLEDs is demonstrated. Parasitic absorption in electrodes represents a significant loss that impedes the efficient recycling of photons in trapped modes. The design strategy is verified by improving the average electroluminescence quantum efficiencies from 19.5% to 22.0% in near‐infrared PeLEDs with thinner indium tin oxide (ITO) electrodes, ultimately achieving a champion efficiency of 23.9%. The effect of photon recycling is visualized by transient photoluminescence mapping. It is quantified computationally that the additional efficiency coming from photon recycling is doubled from 2.3% to 4.8% in the device by suppressing the relative loss in ITO from 39% to 13%. The strategies raise the theoretical upper bound efficiency of PeLEDs with a gold top electrode from 27% to 37% by boosting the photon recycling effect.
Source: Advanced Functional Materials
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,510
Funders: National Research Foundation, National Natural Science Foundation of China, Cambridge Trust, National Research Foundation of Korea, China Scholarship Council, University of Science and Technology of China, Ministry of Science and ICT, South Korea, Engineering and Physical Sciences Research Council
OpenAlex ID: W4402181910