Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Yitong Dong; Ya Kun Wang; Fanglong Yuan; Andrew Johnston; Yuan Liu; Dongxin Ma; Min Jae Choi; Bin Chen; Mahshid Chekini; Se Woong Baek; Laxmi Kishore Sagar; James Fan; Yi Hou; Mingjian Wu; Seungjin Lee; Bin Sun; Sjoerd Hoogland; Rafael Quintero-Bermudez; Hinako Ebe; Petar Todorovic; Filip Dinic; Peicheng Li; Hao Ting Kung; Makhsud I. Saidaminov; Eugenia Kumacheva; Erdmann Spiecker; Liang Sheng Liao; Oleksandr Voznyy; Zheng Hong Lu; Edward H. Sargent

doi:10.1038/s41565-020-0714-5

Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

Yitong Dong, Ya Kun Wang, Fanglong Yuan, Andrew Johnston, Yuan Liu, Dongxin Ma, Min Jae Choi, Bin Chen, Mahshid Chekini, Se Woong Baek, Laxmi Kishore Sagar, James Fan, Yi Hou, Mingjian Wu, Seungjin Lee, Bin Sun, Sjoerd Hoogland, Rafael Quintero-Bermudez, Hinako Ebe, Petar TodorovicFilip Dinic, Peicheng Li, Hao Ting Kung, Makhsud I. Saidaminov, Eugenia Kumacheva, Erdmann Spiecker, Liang Sheng Liao, Oleksandr Voznyy, Zheng Hong Lu, Edward H. Sargent^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

661 Scopus citations

Abstract

Colloidal quantum dot (QD) solids are emerging semiconductors that have been actively explored in fundamental studies of charge transport¹ and for applications in optoelectronics². Forming high-quality QD solids—necessary for device fabrication—requires substitution of the long organic ligands used for synthesis with short ligands that provide increased QD coupling and improved charge transport³. However, in perovskite QDs, the polar solvents used to carry out the ligand exchange decompose the highly ionic perovskites⁴. Here we report perovskite QD resurfacing to achieve a bipolar shell consisting of an inner anion shell, and an outer shell comprised of cations and polar solvent molecules. The outer shell is electrostatically adsorbed to the negatively charged inner shell. This approach produces strongly confined perovskite QD solids that feature improved carrier mobility (≥0.01 cm² V⁻¹ s⁻¹) and reduced trap density relative to previously reported low-dimensional perovskites. Blue-emitting QD films exhibit photoluminescence quantum yields exceeding 90%. By exploiting the improved mobility, we have been able to fabricate CsPbBr₃ QD-based efficient blue and green light-emitting diodes. Blue devices with reduced trap density have an external quantum efficiency of 12.3%; the green devices achieve an external quantum efficiency of 22%.

Original language	English (US)
Pages (from-to)	668-674
Number of pages	7
Journal	Nature nanotechnology
Volume	15
Issue number	8
DOIs	https://doi.org/10.1038/s41565-020-0714-5
State	Published - Aug 1 2020

Funding

This work was supported by the Ontario Research Fund\u2013Research Excellence Program and the Natural Sciences and Engineering Research Council of Canada (NSERC, grant number 537463-18). M.I.S. acknowledges the support of the Banting Postdoctoral Fellowship Program, administered by the Government of Canada. We acknowledge financial support from the Natural Science Foundation of China (numbers 51821002 and 91733301) and the Collaborative Innovation Centre of Suzhou Nano Science and Technology. Y.-K.W. also acknowledges the financial support of the China Scholarship Council (number 201806920067). We thank Huawei Canada for their financial support. Z.-H.L. and all co-authors from the Department of Materials Science and Engineering at the University of Toronto acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC, grant number 216956-12) and the National Natural Science Foundation of China (grant number 11774304).

ASJC Scopus subject areas

Bioengineering
Atomic and Molecular Physics, and Optics
Biomedical Engineering
General Materials Science
Condensed Matter Physics
Electrical and Electronic Engineering

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Dong, Y., Wang, Y. K., Yuan, F., Johnston, A., Liu, Y., Ma, D., Choi, M. J., Chen, B., Chekini, M., Baek, S. W., Sagar, L. K., Fan, J., Hou, Y., Wu, M., Lee, S., Sun, B., Hoogland, S., Quintero-Bermudez, R., Ebe, H., ... Sargent, E. H. (2020). Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots. Nature nanotechnology, 15(8), 668-674. https://doi.org/10.1038/s41565-020-0714-5

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title = "Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots",

abstract = "Colloidal quantum dot (QD) solids are emerging semiconductors that have been actively explored in fundamental studies of charge transport1 and for applications in optoelectronics2. Forming high-quality QD solids—necessary for device fabrication—requires substitution of the long organic ligands used for synthesis with short ligands that provide increased QD coupling and improved charge transport3. However, in perovskite QDs, the polar solvents used to carry out the ligand exchange decompose the highly ionic perovskites4. Here we report perovskite QD resurfacing to achieve a bipolar shell consisting of an inner anion shell, and an outer shell comprised of cations and polar solvent molecules. The outer shell is electrostatically adsorbed to the negatively charged inner shell. This approach produces strongly confined perovskite QD solids that feature improved carrier mobility (≥0.01 cm2 V−1 s−1) and reduced trap density relative to previously reported low-dimensional perovskites. Blue-emitting QD films exhibit photoluminescence quantum yields exceeding 90%. By exploiting the improved mobility, we have been able to fabricate CsPbBr3 QD-based efficient blue and green light-emitting diodes. Blue devices with reduced trap density have an external quantum efficiency of 12.3%; the green devices achieve an external quantum efficiency of 22%.",

author = "Yitong Dong and Wang, {Ya Kun} and Fanglong Yuan and Andrew Johnston and Yuan Liu and Dongxin Ma and Choi, {Min Jae} and Bin Chen and Mahshid Chekini and Baek, {Se Woong} and Sagar, {Laxmi Kishore} and James Fan and Yi Hou and Mingjian Wu and Seungjin Lee and Bin Sun and Sjoerd Hoogland and Rafael Quintero-Bermudez and Hinako Ebe and Petar Todorovic and Filip Dinic and Peicheng Li and Kung, {Hao Ting} and Saidaminov, {Makhsud I.} and Eugenia Kumacheva and Erdmann Spiecker and Liao, {Liang Sheng} and Oleksandr Voznyy and Lu, {Zheng Hong} and Sargent, {Edward H.}",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s), under exclusive licence to Springer Nature Limited.",

year = "2020",

month = aug,

day = "1",

doi = "10.1038/s41565-020-0714-5",

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Dong, Y, Wang, YK, Yuan, F, Johnston, A, Liu, Y, Ma, D, Choi, MJ, Chen, B, Chekini, M, Baek, SW, Sagar, LK, Fan, J, Hou, Y, Wu, M, Lee, S, Sun, B, Hoogland, S, Quintero-Bermudez, R, Ebe, H, Todorovic, P, Dinic, F, Li, P, Kung, HT, Saidaminov, MI, Kumacheva, E, Spiecker, E, Liao, LS, Voznyy, O, Lu, ZH & Sargent, EH 2020, 'Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots', Nature nanotechnology, vol. 15, no. 8, pp. 668-674. https://doi.org/10.1038/s41565-020-0714-5

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AU - Dong, Yitong

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AU - Yuan, Fanglong

AU - Johnston, Andrew

AU - Liu, Yuan

AU - Ma, Dongxin

AU - Choi, Min Jae

AU - Chen, Bin

AU - Chekini, Mahshid

AU - Baek, Se Woong

AU - Sagar, Laxmi Kishore

AU - Fan, James

AU - Hou, Yi

AU - Wu, Mingjian

AU - Lee, Seungjin

AU - Sun, Bin

AU - Hoogland, Sjoerd

AU - Quintero-Bermudez, Rafael

AU - Ebe, Hinako

AU - Todorovic, Petar

AU - Dinic, Filip

AU - Li, Peicheng

AU - Kung, Hao Ting

AU - Saidaminov, Makhsud I.

AU - Kumacheva, Eugenia

AU - Spiecker, Erdmann

AU - Liao, Liang Sheng

AU - Voznyy, Oleksandr

AU - Lu, Zheng Hong

AU - Sargent, Edward H.

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Bipolar-shell resurfacing for blue LEDs based on strongly confined perovskite quantum dots

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