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 Cs0.87MA0.13PbBr3 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang L,Yang X,Jiang Q,Wang P,Yin Z,Zhang X,Tan H,Yang YM,Wei M,Sutherland BR,Sargent EH,You Jdoi
10.1038/ncomms15640subject
Has Abstractpub_date
2017-06-07 00:00:00pages
15640issn
2041-1723pii
ncomms15640journal_volume
8pub_type
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