Perovskite nanocrystals are exceptional candidates for light-emitting diodes (LEDs). However, they are unstable in the solid film and tend to degrade back to the bulk phase, which undermines their potential for LEDs. Here we demonstrate that perovskite nanocrystals stabilized in metal–organic framework (MOF) thin films make bright and stable LEDs. The perovskite nanocrystals in MOF thin films can maintain the photoluminescence and electroluminescence against continuous ultraviolet irradiation, heat and electrical stress. As revealed by optical and X-ray spectroscopy, the strong emission originates from localized carrier recombination. Bright LEDs made from perovskite-MOF nanocrystals are demonstrated with a maximum external quantum efficiency of over 15% and a high brightness of over 10⁵ cd m⁻² after the device reaches stabilization. During LED operation, the nanocrystals can be well preserved, free of ion migration or crystal merging through protection by the MOF matrix, leading to a stable performance over 50 hours.

钙钛矿纳米晶体是发光二极管 (LED) 的特殊候选者。然而，它们在固体薄膜中不稳定，并且倾向于退化回体相，这削弱了它们在 LED 中的潜力。在这里，我们证明了稳定在金属有机框架 (MOF) 薄膜中的钙钛矿纳米晶体可以制造明亮且稳定的 LED。MOF薄膜中的钙钛矿纳米晶体可以在持续的紫外线照射、热和电应力下保持光致发光和电致发光。正如光学和 X 射线光谱所揭示的，强发射源于局部载流子复合。由钙钛矿-MOF 纳米晶体制成的明亮 LED 具有超过 15% 的最大外部量子效率和超过 10 ⁵  cd m ^{-2的高亮度}设备达到稳定后。在 LED 工作期间，通过 MOF 基体的保护，纳米晶体可以得到很好的保存，不会发生离子迁移或晶体合并，性能稳定超过 50 小时。