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

By L. Zhang, Xiaolei Yang, Qi Jiang, Pengyang Wang, Z. Yin, Xingwang Zhang, H. Tan, Y. Yang, Mingyang Wei, B. Sutherland and 2 more. Nature Communications, 2017

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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. Hybrid organic-inorganic perovskites are garnering attention for light emitting diode (LED) applications. Employing a thin hydrophilic insulating polymer, Zhanget al. report LEDs exhibiting a brightness of 91,000 cd m−2and external quantum efficiency of 10.4% using a mixed-cation perovskite.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/97a9ddae3235d5c7d54728ce75d9de85ecc78448