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Efficient CsPbBr3 Perovskite Light-Emitting Diodes Enabled by Synergetic Morphology Control
Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
Hefei Univ Technol HFUT, Peoples R China.
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2019 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 7, no 4, article id 1801534Article in journal (Refereed) Published
Abstract [en]

The development of solution-processed inorganic metal halide perovskite light-emitting diodes (PeLEDs) is currently hindered by low emission efficiency due to morphological defects and severe non-radiative recombination in all-inorganic perovskite emitters. Herein, bright PeLEDs are demonstrated by synergetic morphology control over cesium lead bromide (CsPbBr3) perovskite films with the combination of two additives. The phenethylammonium bromide additive enables the formation of mixed-dimensional CsPbBr3 perovskites featuring the reduced grain size (amp;lt;15 nm) and efficient energy funneling, while the dielectric polyethyleneglycol additive promotes the formation of highly compact and pinhole-free perovskite films with defect passivation at grain boundaries. Consequently, green PeLEDs achieve a current efficiency of 37.14 cd A(-1) and an external quantum efficiency of 13.14% with the maximum brightness up to 45 990 cd m(-2) and high color purity. Furthermore, this method can be effectively extended to realize flexible PeLEDs on plastic substrates with a high efficiency of 31.0 cd A(-1).

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. Vol. 7, no 4, article id 1801534
Keywords [en]
all-inorganic perovskite films; CsPbBr3; morphology control; perovskite light-emitting diodes
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URN: urn:nbn:se:liu:diva-155000DOI: 10.1002/adom.201801534ISI: 000459020300007OAI: oai:DiVA.org:liu-155000DiVA, id: diva2:1297532
Note

Funding Agencies|National Natural Science Foundation of China [61520106012, 61722404, 61522505]; National Key R&D Program of China [2016YFB0401002, 2016YFB0400700]; Collaborative Innovation Center of Suzhou Nano Science and Technology; Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions; ERC Starting Grant [717026]

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-03-20

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