Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence

Abstract The slow bimolecular recombination that drives three-dimensional lead-halide perovskites’ outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 10 15 cm −3 , defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative recombination. Herein, we overcome this limitation using van-der-Waals-coupled Ruddlesden-Popper perovskite multi-quantum-wells. Injected charge carriers are rapidly localized from adjacent thin few layer ( n ≤4) multi-quantum-wells to the thick ( n ≥5) multi-quantum-wells with extremely high efficiency (over…

• NR
  National Research Foundation

  Award: NRF-CRP14-2014-03
• NR
  National Research Foundation Singapore

  Awards: NRF-CRP14-2014-03, CRP14-2014-03
• NT
  Nanyang Technological University

  Awards: M4080514, Tier 1
• NN
  National Natural Science Foundation of China

  Awards: 61605073, 2015CB932200
• MO
  Ministry of Education, India
• NT
  Nanjing Tech University
• NK
  National Key Research and Development Program of China

  Award: 2015CB932200