Organic-inorganic hybrid perovskite have recently drawn appreciable attention for applications in light-emitting diodes (LEDs). However, the weak exciton binding energy of the methylammonium lead iodide perovskite introduces large exciton dissociation and low radiative recombination on its application as emission layer in near-infrared LEDs. Herein, we demonstrate the simple method by incorporating of phenethylammonium iodide (PEAI) into the perovskite can concurrently improve the radiative recombination rate for improving perovskite LED performances. Additionally, by introducing PEAI dramatically constrains the growth of perovskite crystals during film forming, producing crystallites with small dimensions, reducing roughness, and pin-hole free. After optimizing the emission layer in the perovskite LED, a high optical output power of 458.03 μW and external quantum efficiency of 5.25% are achieved, which represents a ~50-fold enhancement in the quantum efficiency compared to device without PEAI. Our work suggests a broad application prospect of perovskite materials for high optical output power LEDs and eventually a potential for solution-processed electrically pumped NIR laser diodes.

有机-无机杂化钙钛矿最近在发光二极管 (LED) 中的应用引起了相当大的关注。然而，甲基铵碘化铅钙钛矿的弱激子结合能在其作为近红外 LED 发射层的应用中引入了大激子解离和低辐射复合。在此，我们证明了通过将苯乙基碘化铵 (PEAI) 掺入钙钛矿中的简单方法可以同时提高辐射复合率，从而提高钙钛矿 LED 的性能。此外，通过引入 PEAI 显着限制了成膜过程中钙钛矿晶体的生长，产生小尺寸的微晶，降低粗糙度和无针孔。优化钙钛矿 LED 中的发射层后，光输出功率高达 458。实现了 03 μW 和 5.25% 的外部量子效率，与没有 PEAI 的器件相比，量子效率提高了约 50 倍。我们的工作表明钙钛矿材料在高光输出功率 LED 中具有广阔的应用前景，并最终具有溶液加工电泵浦 NIR 激光二极管的潜力。