Nature, Published online: 11 February 2026; doi:10.1038/s41586-026-10134-1

A strategy using simple one-step spin-coating to form 3D/2D vertically oriented perovskite heterojunctions is described, allowing the fabrication of perovskite light-emitting diodes with record-high green emission efficiencies of 42.9% (certified 42.3%).

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