Perovskite nanocrystal light-emitting diodes (LEDs) employing architecture comprising a ZnO nanoparticles electron-transport layer and a conjugated polymer hole-transport layer have been fabricated. The obtained LEDs demonstrate a maximum external-quantum-efficiency of 6.04%, luminance of 12998 Cd/m2 and stable electroluminescence at 519 nm. Importantly, such high efficiency and brightness have been achieved by employing solution processed transport 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 retained upon film fabrica-tion. The results show that perovskite NC LEDs can achieve high-performance without the use of transport layers deposited through evapo-ration in ultra-high-vacuum.
@article{arxiv.1901.10304,
title = {High-Efficiency Light-Emitting Diodes based on Formamidinium lead bromide nanocrystals and solution processed transport layers},
author = {Francesco Di Stasio and Inigo Ramiro and Yu Bi and Sotirios Christodoulou and Alexandros Stavrinadis and Gerasimos Konstantatos},
journal= {arXiv preprint arXiv:1901.10304},
year = {2019}
}