Efficient Inorganic Perovskite Light-Emitting Diodes with Polyethylene Glycol Passivated Ultrathin CsPbBr3 Films
- 21 August 2017
- journal article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 8 (17), 4148-4154
- https://doi.org/10.1021/acs.jpclett.7b01733
Abstract
Efficient inorganic perovskite light-emitting diodes (PeLEDs) with an ultrathin perovskite emission layer (~30 nm) were realized by doping Lewis base Polyethylene Glycol (PEG) into CsPbBr3 films. PEG in the perovskite films not only physically fills the crystal boundaries, but also interacts with the perovskite crystals to passivate the crystal grains, reduce nonradiative recombination and ensure the efficient luminance and high efficiency. As a result, promoted brightness, current efficiency (CE) and external quantum efficiency (EQE) were achieved. After further optimization of the molar ratio between CsBr and PbBr2, a peak CE of 19 cd/A, a maximum EQE of 5.34% and a maximum brightness of 36600 cd/m2 were achieved, demonstrating the interaction between PEG and the precursors. The results are expected to offer some helpful implications in optimizing the polymer assisted PeLEDs with ultrathin emission layers, which might have potential application in see-through displays.Keywords
Funding Information
- National Natural Science Foundation of China (51503196, 61405195)
- Chinese Academy of Sciences
- State Key Laboratory of Luminescence and Applications
- Jilin Province (20150101039JC, 20160520092JH, 20160520176JH, 20170101039JC)
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