biostudies-literatureHu LShenzhen technology research projectthe Ministry of Education Industry-University Cooperation and Collaborative Education ProjectShenzhen Technology University School-Enterprise Cooperation ProjectGuangdong Basic and Applied Basic Research Foundation1454https://www.ebi.ac.uk/biostudies/studies/S-EPMC9102924biostudies-literatureUnknown12(9)Highly luminescent FAPb_0.7Sn_0.3Br₃ nanocrystals with an average photoluminescence (PL) quantum yield of 92% were synthesized by the ligand-assisted reprecipitation method. The 41-nm-thick perovskite film with a smooth surface and strong PL intensity was proven to be a suitable luminescent layer for perovskite light-emitting diodes (PeLEDs). Electrical tests indicate that the double hole-transport layers (HTLs) played an important role in improving the electrical-to-optical conversion efficiency of PeLEDs due to their cascade-like level alignment. The PeLED based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,40-(N-(p-butylphenyl))-diphenylamine)] (TFB)/poly(9-vinylcarbazole) (PVK) double HTLs produced a high external quantum efficiency (EQE) of 9%, which wasNanomaterials (Basel, Switzerland)Marked Efficiency Improvement of FAPb_0.7Sn_0.3Br₃ Perovskite Light-Emitting Diodes by Optimization of the Light-Emitting Layer and Hole-Transport Layer.PMC9102924No.202002105037(No. 2019A1515110230, 2021A1515012055No. JSGG20201102162200002No. 20211064010033Xiang BWang NCui XWang WAn HHu LWu DLi BQiu MWang ZWang KYe ZfalseMarked Efficiency Improvement of FAPb_0.7Sn_0.3Br₃ Perovskite Light-Emitting Diodes by Optimization of the Light-Emitting Layer and Hole-Transport Layer.Highly luminescent FAPb_0.7Sn_0.3Br₃ nanocrystals with an average photoluminescence (PL) quantum yield of 92% were synthesized by the ligand-assisted reprecipitation method. The 41-nm-thick perovskite film with a smooth surface and strong PL intensity was proven to be a suitable luminescent layer for perovskite light-emitting diodes (PeLEDs). Electrical tests indicate that the double hole-transport layers (HTLs) played an important role in improving the electrical-to-optical conversion efficiency of PeLEDs due to their cascade-like level alignment. The PeLED based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,40-(N-(p-butylphenyl))-diphenylamine)] (TFB)/poly(9-vinylcarbazole) (PVK) double HTLs produced a high external quantum efficiency (EQE) of 9%, which was2022-01-01T00:00:00Z2022 Apr2025-04-04T22:54:09.085Z2025-02-19T00:56:43.992ZS-EPMC91029243556416310.3390/nano12091454