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Abstract 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… Click to show full abstract
Abstract 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.
Journal Title: Organic Electronics
Year Published: 2018
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