Colloidal perovskite quantum dots for display applications
발표자
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초록
내용
We design a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles with fewer surface defects. Doping of larger guanidinium (GA) into formamidinium (FA) lead bromide PNCs yields limited bulk solubility, above which extra GA segregates to the surface and stabilizes the under-coordinated sites. Increasing GA concentration requires higher surface/volume, leading to smaller PNCs for more carrier confinement and high photoluminescence quantum efficiency (> 90%). Furthermore, colloidal PNCs decouple the crystallization of perovskites from the film formation and thus achieve high external quantum efficiency (EQE) of 23.26% in a pixel area of 4 mm2, EQE of 22.5% in a large pixel area of 102 mm2 and EQE of 21.46% in 900mm2. Furthermore, we successfully demonstrate the PNC patterns which are stable in water for more than 100 days.