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

Liuqi Zhang, Xiaolei Yang, Qi Jiang, Pengyang Wang, Zhigang Yin, Xingwang Zhang, Hairen Tan, Yang Michael Yang, Mingyang Wei, Brandon R. Sutherland, Edward H. Sargent, Jingbi You*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

729 Scopus citations

Abstract

Inorganic perovskites such as CsPbX3 (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 CsPbBr3 lattice and by depositing a hydrophilic and insulating polyvinyl pyrrolidine polymer atop the ZnO electron-injection layer to overcome these issues. As a result, we obtained light-emitting diodes exhibiting a high brightness of 91,000 cd m-2 and a high external quantum efficiency of 10.4% using a mixed-cation perovskite Cs0.87 MA0.13 PbBr3 as the emitting layer. To the best of our knowledge, this is the brightest and most-efficient green perovskite light-emitting diodes reported to date.

Original languageEnglish (US)
Article number15640
JournalNature communications
Volume8
DOIs
StatePublished - Jun 7 2017

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology

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