Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes

PaperPhelos
Written By Fluxim AG

Sudhir Kumar, Tommaso Marcato, Frank Krumeich, Yen-Ting Li, Yu-Cheng Chiu and Chih-Jen Shih

Nat Commun. (2022), 13, 2106

https://www.nature.com/articles/s41467-022-29812-5

The intrinsic light outcoupling efficiency of quantum dots remains considerably lower than the organic counterpart.

The authors, using the colloidal lead halide perovskite anisotropic nanocrystals (ANCs) as a model system, report a directed self-assembly approach to form an anisotropic nanocrystal superlattice of perovskite nanocrystals. The emission polarization in individual ANCs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. The optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24.96%, comparable to state-of-the-art organic LEDs.

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