Ultra-bright and highly efficient inorganic based perovskite light-emitting diodes

Abstract Inorganic perovskites such as CsPbX 3 (X=Cl, Br, I) have attracted attention due to their excellent thermal stability and high photoluminescence quantum efficiency. However, the electroluminescence quantum efficiency of their light-emitting diodes was <1%. We posited that this low efficiency was a result of high leakage current caused by poor perovskite morphology, high non-radiative recombination at interfaces and perovskite grain boundaries, and also charge injection imbalance. Here, we incorporated a small amount of methylammonium organic cation into the CsPbBr 3 lattice and by depositing a hydrophilic and insulating polyvinyl pyrrolidine polymer atop the ZnO electron-injection layer to overcome…

• NN
  National Natural Science Foundation of China

  Awards: 61574133, 2016YFB0700700, 61634001
• CA
  Chinese Academy of Sciences

  Award: 2016YFB0700700
• CU
  Chongqing University
• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek

  Award: 680-50-1511
• BU
  Beijing University of Technology
• UO
  University of Toronto
• NU
  Nanjing University of Science and Technology
• NU
  Nanjing University
• IO
  Institute of Semiconductors, Chinese Academy of Sciences
• NK
  National Key Research and Development Program of China

  Award: 2016YFB0700700