Formamidinium (FA) lead bromide (FAPbBr₃) perovskite nanocrystals (P-NCs) have ultrapure green emission and high stability, while FAPbBr₃ NCs based light-emitting diodes (FA-NLEDs) still have little report. Here, FAPbBr₃ NCs with a high photoluminescence quantum yield of 85.8% were synthesized. By controlling the concentration of FAPbBr₃ NCs in toluene solution, the exciton recombination region was precisely confined to the emitting layer and the parasitic emission coming from electron transport layer disappeared, resulting in the pure green emissions. The optimized FA-NLED presents a maximum external quantum efficiency (EQE), current efficiency (CE) of 3.84% and 16.08 cd/A respectively, with the EL emission peak of 528 nm, CIE of (0.183, 0.763) and a full width of half-maximum (FWHM) of 24 nm, which is among the best performance of FA-NLEDs.

甲ami（FA）溴化铅（FAPbBr ₃）钙钛矿纳米晶体（P-NCs）具有超纯绿色发射和高稳定性，而基于FAPbBr ₃ NCs的发光二极管（FA-NLEDs）尚无报道。在此，合成了具有85.8％的高光致发光量子产率的FAPbBr ₃ NC。通过控制FAPbBr ₃的浓度甲苯溶液中的NCs，激子复合区精确地限制在发射层内，电子传输层产生的寄生发射消失，产生纯绿色发射。经过优化的FA-NLED的最大外部量子效率（EQE），电流效率（CE）分别为3.84％和16.08 cd / A，EL发射峰为528 nm，CIE为（0.183，0.763）和全宽度半高（FWHM）为24 nm，这是FA-NLED的最佳性能之一。