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Perovskite nanocrystal light-emitting diodes (LEDs) employing architecturecomprising a ZnO nanoparticles electron-transport layer and a conjugatedpolymer hole-transport layer have been fabricated. The obtained LEDsdemonstrate a maximum external-quantum-efficiency of 6.04%, luminance of 12998Cd/m2 and stable electroluminescence at 519 nm. Importantly, such highefficiency and brightness have been achieved by employing solution processedtransport layers, formamidinium lead bromide nanocrystals (CH(NH2)2PbBr3 NCs)synthesized at room-temperature and in air without the use of a Schlenk line,and a procedure based on atomic layer deposition to insolubilize the NC film.The obtained NCs show a photoluminescence quantum yield of 90% that is retainedupon film fabrica-tion. The results show that perovskite NC LEDs can achievehigh-performance without the use of transport layers deposited throughevapo-ration in ultra-high-vacuum.

High-Efficiency Light-Emitting Diodes based on Formamidinium lead bromide nanocrystals and solution processed transport layers