Bright Perovskite Nanocrystal Films for Efficient Light-Emitting Devices.

Abstract

The high photoluminescence efficiency, high color purity, and easy tunable bandgap make inorganic perovskite nanocrystals very attractive in luminescent display applications. Here, we report a color-saturated, red light-emitting diode (LED) using an inverted organic/inorganic hybrid structure and perovskite nanocrystals. We demonstrated that through a simple post treatment to the perovskite nanocrystals with polyethylenimine, the surface defects of the perovskite nanocrystals could be well passivated, leading to great enhancements on their absolute photoluminescence quantum yield and photoluminescence lifetime. Through using a well-passivated perovskite nanocrystal film and optimizing the charge balance, we achieved an electroluminescence LED with a current efficiency of 3.4 cd A(-1), corresponding to an external quantum efficiency (EQE) of 6.3%, which is the highest value reported among perovskite NC LEDs so far.

Cite this paper

@article{Zhang2016BrightPN, title={Bright Perovskite Nanocrystal Films for Efficient Light-Emitting Devices.}, author={Xiaoyu Zhang and Chun J. Sun and Yu Zhang and Hua Wu and Changyin Ji and Yahui Chuai and Peng Wang and Shanpeng Wen and Chunfeng Zhang and William W Yu}, journal={The journal of physical chemistry letters}, year={2016}, volume={7 22}, pages={4602-4610} }