Three-dimensional (3D) polycrystalline perovskite is emerging as a promising candidate for high-brightness light-emitting applications. However, 3D perovskite light-emitting diodes (PeLEDs) are difficult to achieve high brightness, efficiency, and stability simultaneously, as they are limited by the trade-off between the advanced external quantum efficiency (EQE) and the inevitable roll-off. Here, we develop a 3D FAPbI perovskite material system that enables high brightness, efficiency, and long device lifetime simultaneously, engineered by an alkyl-chain-length-dependent ammonium salt molecule modulation strategy. We elucidate the roles of alkylammonium salts on crystal orientation management, grain size control, non-radiative recombination suppression, and thus device performances. Consequently, we simultaneously obtain efficient, ultra-bright, and stable PeLEDs with a high EQE of 23.2%, a record radiance of 1,593 W sr m and a record lifetime of 227 h (at a high current density of 100 mA cm), representing the best performance for the DC-drive near-infrared (NIR) PeLEDs at high-brightness levels.

中文翻译：

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晶粒取向管理和重组抑制，实现具有创纪录亮度的超稳定 PeLED

三维（3D）多晶钙钛矿正在成为高亮度发光应用的有希望的候选者。然而，3D 钙钛矿发光二极管 (PeLED) 很难同时实现高亮度、高效率和稳定性，因为它们受到先进的外部量子效率 (EQE) 和不可避免的滚降之间的权衡的限制。在此，我们开发了一种 3D FAPbI 钙钛矿材料系统，该系统通过烷基链长度依赖的铵盐分子调制策略进行设计，可同时实现高亮度、高效率和长器件寿命。我们阐明了烷基铵盐在晶体取向管理、晶粒尺寸控制、非辐射复合抑制以及器件性能方面的作用。因此，我们同时获得了高效、超亮、稳定的 PeLED，其 EQE 为 23.2%，辐射亮度为 1,593 W sr m，创纪录的寿命为 227 小时（在 100 mA cm 高电流密度下），代表直流驱动近红外 (NIR) PeLED 在高亮度水平下的最佳性能。