"Stacking light-generating layers in 'tandem' light-emitting diodes (LEDs) can enhance performance, but achieving efficient and stable tandem LEDs made with perovskite materials has remained a challenge."
"A tandem perovskite-based device that seems to benefit from 'recycling' of photons between stacked layers demonstrates highly efficient performance, surpassing the combined emissions of two single-unit devices."
"doi: https://doi.org/10.1038/d41586-025-04021-4 Publisher's note: N.W. and J.W. used ChatGPT to help prepare their contribution to this Research Briefing."
Stacking light-generating layers in tandem LEDs enables interaction between emitting layers that can boost brightness and efficiency beyond single-unit devices. Perovskite materials offer strong luminescence and wavelength tunability but pose challenges for creating efficient, stable tandem configurations. Photon recycling between stacked perovskite layers can recapture emitted photons and redirect them for additional emission, effectively amplifying output. A tandem perovskite device showing photon recycling achieves substantially higher efficiency and output than two equivalent single-unit LEDs operating independently. Enhanced photon management in stacked perovskite LEDs provides a pathway to more efficient light-emitting devices.
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