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Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications
Faculty of Informatics and Engineering, The University of Electro-Communications, CREST, Japan Science and Technology Agency (JST)
Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology
Faculty of Life Science and Systems Engineering, Kyushu Institute of Technology, CREST, Japan Science and Technology Agency (JST)
Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, Ritsumeikan University, CREST, Japan Science and Technology Agency (JST)
Department of Electrical and Electronic Engineering, Miyazaki University, CREST, Japan Science and Technology Agency (JST)
Beijing Key Laboratory of Novel Thin Film Solar Cells, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
Faculty of Informatics and Engineering, The University of Electro-Communications, CREST, Japan Science and Technology Agency (JST)
抄録
Perovskite quantum dots (QDs) as a new type of colloidal nanocrystals have gained significant attention for both fundamental research and commercial applications owing to their appealing optoelectronic properties and excellent chemical processability. For their wide range of potential applications, synthesizing colloidal QDs with high crystal quality is of crucial importance. However, like most common QD systems such as CdSe and PbS, those reported perovskite QDs still suffer from a certain density of trapping defects, giving rise to detrimental nonradiative recombination centers and thus quenching luminescence. In this paper, we show that a high room-temperature photoluminescence quantum yield of up to 100% can be obtained in CsPbI3 perovskite QDs, signifying the achievement of almost complete elimination of the trapping defects. This is realized with our improved synthetic protocol that involves introducing organolead compound trioctylphosphine–PbI2 (TOP–PbI2) as the reactive precursor, which also leads to a significantly improved stability for the resulting CsPbI3 QD solutions. Ultrafast kinetic analysis with time-resolved transient absorption spectroscopy evidence the negligible electron or hole-trapping pathways in our QDs, which explains such a high quantum efficiency. We expect the successful synthesis of the “ideal” perovskite QDs will exert profound influence on their applications to both QD-based light-harvesting and -emitting devices.
雑誌名
ACS Nano
巻
11
号
10
ページ
10373 - 10383
発行年
2017-10-24
出版者
American Chemical Society
ISSN
1936-0851
1936-086X
書誌レコードID
AA1240653X
DOI
info:doi/10.1021/acsnano.7b05442
権利
American Chemical Society
This material is excerpted from a work that was published in ACS Nano, Copyright (c) American Chemical Society after peer review.
To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acsnano.7b05442.
Highly Luminescent Phase-Stable CsPbI3 Perovskite Quantum Dots Achieving Near 100% Absolute Photoluminescence Quantum Yield
ACSnano11_10373.pdf
(1.47MB)
