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Efficient Blue Electroluminescence Using Quantum-Confined Two-Dimensional Perovskites

Research output: Contribution to journalArticle

  • S. Kumar
  • J. Jagielski
  • S. Yakunin
  • P. Rice
  • Y.-C. Chiu
  • M. Wang
  • G. Nedelcu
  • Y. Kim
  • S. Lin
  • E.J.G. Santos
  • M.V. Kovalenko
  • C.-J. Shih

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Original languageEnglish
Pages (from-to)9720-9729
Number of pages10
JournalAcs nano
Volume10
Issue number10
Early online date3 Oct 2016
DOIs
Publication statusPublished - 25 Oct 2016

Abstract

Solution-processed hybrid organic–inorganic lead halide perovskites are emerging as one of the most promising candidates for low-cost light-emitting diodes (LEDs). However, due to a small exciton binding energy, it is not yet possible to achieve an efficient electroluminescence within the blue wavelength region at room temperature, as is necessary for full-spectrum light sources. Here, we demonstrate efficient blue LEDs based on the colloidal, quantum-confined 2D perovskites, with precisely controlled stacking down to one-unit-cell thickness (n = 1). A variety of low-k organic host compounds are used to disperse the 2D perovskites, effectively creating a matrix of the dielectric quantum wells, which significantly boosts the exciton binding energy by the dielectric confinement effect. Through the Förster resonance energy transfer, the excitons down-convert and recombine radiatively in the 2D perovskites. We report room-temperature pure green (n = 7–10), sky blue (n = 5), pure blue (n = 3), and deep blue (n = 1) electroluminescence, with record-high external quantum efficiencies in the green-to-blue wavelength region.

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