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Efficient and Tunable Electroluminescence from In Situ Synthesized Perovskite Quantum Dots
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Univ Cambridge, England; Imperial Coll London, England.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 15, no 8, article id 1804947Article in journal (Refereed) Published
Abstract [en]

Semiconductor quantum dots (QDs) are among the most promising next-generation optoelectronic materials. QDs are generally obtained through either epitaxial or colloidal growth and carry the promise for solution-processed high-performance optoelectronic devices such as light-emitting diodes (LEDs), solar cells, etc. Herein, a straightforward approach to synthesize perovskite QDs and demonstrate their applications in efficient LEDs is reported. The perovskite QDs with controllable crystal sizes and properties are in situ synthesized through one-step spin-coating from perovskite precursor solutions followed by thermal annealing. These perovskite QDs feature size-dependent quantum confinement effect (with readily tunable emissions) and radiative monomolecular recombination. Despite the substantial structural inhomogeneity, the in situ generated perovskite QDs films emit narrow-bandwidth emission and high color stability due to efficient energy transfer between nanostructures that sweeps away the unfavorable disorder effects. Based on these materials, efficient LEDs with external quantum efficiencies up to 11.0% are realized. This makes the technologically appealing in situ approach promising for further development of state-of-the-art LED systems and other optoelectronic devices.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. Vol. 15, no 8, article id 1804947
Keywords [en]
energy transfer; light-emitting diodes; organic-inorganic hybrid perovskites; tunable emission
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-154995DOI: 10.1002/smll.201804947ISI: 000459488300001PubMedID: 30690874OAI: oai:DiVA.org:liu-154995DiVA, id: diva2:1297551
Note

Funding Agencies|ERC Starting Grant [717026]; Carl Tryggers Stiftelse; European Commission Marie SklodowskaCurie Actions [691210]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; China Scholarship Council

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-08-22

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The full text will be freely available from 2020-01-28 13:23
Available from 2020-01-28 13:23

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Yu, HonglingWang, HeyongLu, JunYuan, ZhongchengXu, WeidongHultman, LarsLiu, XiaokeGao, Feng
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