Suppressing phase disproportionation in quasi-2D perovskite light-emitting diodes

Abstract Electroluminescence efficiencies and stabilities of quasi-two-dimensional halide perovskites are restricted by the formation of multiple-quantum-well structures with broad and uncontrollable phase distributions. Here, we report a ligand design strategy to substantially suppress diffusion-limited phase disproportionation, thereby enabling better phase control. We demonstrate that extending the π-conjugation length and increasing the cross-sectional area of the ligand enables perovskite thin films with dramatically suppressed ion transport, narrowed phase distributions, reduced defect densities, and enhanced radiative recombination efficiencies. Consequently, we achieved efficient and stable deep-red…

• NS
  National Science Foundation

  Awards: 2131608, 2131608-ECCS, CBET-1626418, 1626418
• UD
  U.S. Department of Energy

  Awards: DE-SC0018208, DE-SC0022082
• RU
  Rice University
• NN
  National Natural Science Foundation of China

  Award: 11774188
• OO
  Office of Science
• MU
  Multidisciplinary University Research Initiative
• OO
  Office of Naval Research

  Awards: N00014-21-1-2026, N00014
• DO
  Division of Chemical, Bioengineering, Environmental, and Transport Systems

  Awards: CBET-1626418, 1626418
• DO
  Division of Electrical, Communications and Cyber Systems

  Award: 2131608-ECCS
• BE
  Basic Energy Sciences

  Awards: DE-SC0022082, CBET-1626418, DE-SC0018208