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Direct Synthesis of Quaternary Alkylammonium-Capped Perovskite Nanocrystals for Efficient Blue and Green Light-Emitting Diodes
journal contribution
posted on 2019-10-18, 18:33 authored by Yevhen Shynkarenko, Maryna I. Bodnarchuk, Caterina Bernasconi, Yuliia Berezovska, Vladyslav Verteletskyi, Stefan T. Ochsenbein, Maksym V. KovalenkoCesium
lead halide nanocrystals (CsPbX3 NCs) are new
inorganic light sources covering the entire visible spectral range
and exhibiting near-unity efficiencies. While the last years have
seen rapid progress in green and red electroluminescence from CsPbX3 NCs, the development of blue counterparts remained rather
stagnant. Controlling the surface state of CsPbX3 NCs had
proven to be a major factor governing the efficiency of the charge
injection and for diminishing the density of traps. Although didodecyldimethylammonium
halides (DDAX; X = Br, Cl) had been known to improve the luminescence
of CsPbX3 NCs when applied postsynthetically, they had
not been used as the sole long-chain ammonium ligand directly in the
synthesis of these NCs. Herein we report a facile, direct synthesis
of DDAX-stabilized CsPbX3 NCs. We then demonstrate blue
and green light-emitting diodes, characterized by the electroluminescence
at 463–515 nm and external quantum efficiencies of 9.80% for
green, 4.96% for sky-blue, and 1.03% for deep-blue spectral regions.
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near-unity efficienciesDDAX-stabilized CsPbX 3 NCslight sourcescharge injectiondidodecyldimethylammonium halidesQuaternary Alkylammonium-Capped Perovskite NanocrystalsGreen Light-Emitting Diodes Cesiumefficiencylong-chain ammonium ligandhalide nanocrystalssurface statelight-emitting diodesCsPbX 3 NCsDirect Synthesisquantum efficienciesEfficient Blue
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