Journal
ADVANCED MATERIALS
Volume 30, Issue 50, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805409
Keywords
electrical transportation; organic-inorganic hybrid passivation; perovskites; quantum-dot-based light-emitting diodes; radiative recombination
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Funding
- National Key Research and Development Program of China [2016YFB0401701]
- NSFC [61604074, 51572128, 61725402]
- Natural Science Foundation of Jiangsu Province [BK20160827]
- China Postdoctoral Science Foundation [2016M590455]
- Fundamental Research Funds for the Central Universities [30917011202, 30916015106]
- PAPD of Jiangsu Higher Education Institutions
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Perovskite quantum dots (QDs) with high photoluminescence quantum yields (PLQYs) and narrow emission peak hold promise for next-generation flexible and high-definition displays. However, perovskite QD films often suffer from low PLQYs due to the dynamic characteristics between the QD's surface and organic ligands and inefficient electrical transportation resulting from long hydrocarbon organic ligands as highly insulating barrier, which impair the ensuing device performance. Here, a general organic-inorganic hybrid ligand (OIHL) strategy is reported on to passivate perovskite QDs for highly efficient electroluminescent devices. Films based on QDs through OIHLs exhibit enhanced radiative recombination and effective electrical transportation properties compared to the primal QDs. After the OIHL passivation, QD-based light-emitting diodes (QLEDs) exhibit a maximum peak external quantum efficiency (EQE) of 16.48%, which is the most efficient electroluminescent device in the field of perovskite-based LEDs up to date. The proposed OIHL passivation strategy positions perovskite QDs as an extremely promising prospect in future applications of high-definition displays, high-quality lightings, as well as solar cells.
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