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Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes.
Kumar, Sudhir; Marcato, Tommaso; Krumeich, Frank; Li, Yen-Ting; Chiu, Yu-Cheng; Shih, Chih-Jen.
Afiliación
  • Kumar S; Institute for Chemical and Bioengineering, ETH Zürich, 8093, Zürich, Switzerland.
  • Marcato T; Institute for Chemical and Bioengineering, ETH Zürich, 8093, Zürich, Switzerland.
  • Krumeich F; Laboratory of Inorganic Chemistry, ETH Zürich, 8093, Zürich, Switzerland.
  • Li YT; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan, ROC.
  • Chiu YC; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, ROC.
  • Shih CJ; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan, ROC.
Nat Commun ; 13(1): 2106, 2022 Apr 19.
Article en En | MEDLINE | ID: mdl-35440650
Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite anisotropic nanocrystals (ANCs) as a model system, we report a directed self-assembly approach to form the anisotropic nanocrystal superlattices (ANSLs). Emission polarization in individual ANCs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of ANSLs, we demonstrate an enhanced ratio of horizontal dipole up to 0.75, enhancing the theoretical light outcoupling efficiency of greater than 30%. Our 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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido