Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 22, Pages 4602-4610Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02073
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Funding
- National Natural Science Foundation of China [51272084, 61225018, 61475062, 61675086]
- Jilin Province Key Fund [20140204079GX]
- NSF
- BORSF RCS
- National Postdoctoral Program for Innovative Talents [BX201600060]
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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.
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