Performance of blue solution-processed perovskite light-emitting diodes (LEDs) is limited by availability of blue perovskite materials. Herein, 4-(trifluoromethyl)benzoyl ammonium bromide (4-TMBABr) is used with abundant NH and CO groups to passivate the defects and produce highly stable PEA_xPA_2-x(CsPbBr₃)_n-1PbBr₄ perovskites for blue LED applications. The NH group in the 4-TMBABr suppresses the Br-ion mismatch through hydrogen bonds (N-H···Br) and CO group coordinates the unsaturated lead dangling bonds (CO:Pb). The effective defect passivation by 4-TMBABr reduces the nonradiative recombination in the perovskite films, hence enhancing its optical performance. In the LED structure, the sodium bis(trifluoromethanesulfonyl)imide (SBTI) modified NiO_x films are used to improve the hole transport and to inhibit the fluorescence quenching of the perovskite layer. The dual-defect manipulation strategy is advantageous for producing efficient and spectrally stable blue perovskite LEDs, and the authors demonstrate an LED with maximum luminance of 1094 cd m⁻² and external quantum efficiency of 10.3%. This work can inform and underpin future development of blue perovskite LEDs with highly efficient and stabile performance.

中文翻译：

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双缺陷操控可实现高效且光谱稳定的蓝色钙钛矿发光二极管

蓝色溶液加工的钙钛矿发光二极管（LED）的性能受到蓝色钙钛矿材料的可用性的限制。在此，4-(三氟甲基)苯甲酰溴化铵(4-TMBABr)与丰富的N - H和C-O基团一起钝化缺陷并产生高度稳定的PEA x _PA 2 _-x (CsPbBr ₃ ) _n-1 PbBr ₄用于蓝色 LED 应用的钙钛矿。N _4-TMBABr中的H基团通过氢键(NH·Br)抑制Br离子错配，CO基团配位不饱和铅悬空键(CO:Pb)。4-TMBABr 的有效缺陷钝化减少了钙钛矿薄膜中的非辐射复合，从而提高了其光学性能。在LED结构中，双(三氟甲磺酰)亚胺钠(SBTI)修饰的NiO _x薄膜用于改善空穴传输并抑制钙钛矿层的荧光猝灭。双缺陷操纵策略有利于生产高效且光谱稳定的蓝色钙钛矿LED，作者展示了最大亮度为1094 cd m ^-2的LED外量子效率为10.3%。这项工作可以为具有高效和稳定性能的蓝色钙钛矿 LED 的未来发展提供信息和支撑。