Nature, Published online: 31 December 2025; doi:10.1038/d41586-025-04021-4

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.

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