High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization

Hongyan Liang; Fanglong Yuan; Andrew Johnston; Congcong Gao; Hitarth Choubisa; Yuan Gao; Ya Kun Wang; Laxmi Kishore Sagar; Bin Sun; Peicheng Li; Golam Bappi; Bin Chen; Jun Li; Yunkun Wang; Yitong Dong; Dongxin Ma; Yunan Gao; Yongchang Liu; Mingjian Yuan; Makhsud I. Saidaminov; Sjoerd Hoogland; Zheng Hong Lu; Edward H. Sargent

doi:10.1002/advs.201903213

High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization

Hongyan Liang, Fanglong Yuan, Andrew Johnston, Congcong Gao, Hitarth Choubisa, Yuan Gao, Ya Kun Wang, Laxmi Kishore Sagar, Bin Sun, Peicheng Li, Golam Bappi, Bin Chen, Jun Li, Yunkun Wang, Yitong Dong, Dongxin Ma, Yunan Gao, Yongchang Liu, Mingjian Yuan, Makhsud I. SaidaminovSjoerd Hoogland, Zheng Hong Lu^*, Edward H. Sargent

^*Corresponding author for this work

Chemistry

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

186 Scopus citations

Abstract

Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)—the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V⁻¹ with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H₃PO₂. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H₃PO₂ additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m⁻²; this is the record among reported red-emitting, lead-free PeLEDs.

Original language	English (US)
Article number	1903213
Journal	Advanced Science
Volume	7
Issue number	8
DOIs	https://doi.org/10.1002/advs.201903213
State	Published - Apr 1 2020

Funding

H.Y.L., F.L.Y., A.J., and C.C.G. contributed equally to this work. H.Y.L. acknowledges financial support from the National Natural Science Foundation of China (NSFC) (No. 51771132), Recruitment Program of Global Youth Experts of China Talents Plan of China, the Natural Sciences and Engineering Research Council of Canada (NSERC) Postdoctoral Fellowship (PDF). E.H.S. and all co\u2010authors from the Department of Electrical and Computer Engineering at the University of Toronto acknowledge the financial support by the Global Research Outreach program of Samsung Advanced Institute of Technology and the Ontario Research Fund Research Excellence Program and the Natural Sciences and Engineering Research Council of Canada (NSERC).

Keywords

HPO additives
Sn stabilization
Sn-based red light-emitting diodes
antioxidation
lead-free perovskites

ASJC Scopus subject areas

Medicine (miscellaneous)
General Chemical Engineering
General Materials Science
Biochemistry, Genetics and Molecular Biology (miscellaneous)
General Engineering
General Physics and Astronomy

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10.1002/advs.201903213

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Liang, H., Yuan, F., Johnston, A., Gao, C., Choubisa, H., Gao, Y., Wang, Y. K., Sagar, L. K., Sun, B., Li, P., Bappi, G., Chen, B., Li, J., Wang, Y., Dong, Y., Ma, D., Gao, Y., Liu, Y., Yuan, M., ... Sargent, E. H. (2020). High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization. Advanced Science, 7(8), Article 1903213. https://doi.org/10.1002/advs.201903213

@article{a56eeaea923f4b1e857cccf6cc77c9a1,

title = "High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization",

abstract = "Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)—the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V−1 with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H3PO2. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H3PO2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m−2; this is the record among reported red-emitting, lead-free PeLEDs.",

keywords = "HPO additives, Sn stabilization, Sn-based red light-emitting diodes, antioxidation, lead-free perovskites",

author = "Hongyan Liang and Fanglong Yuan and Andrew Johnston and Congcong Gao and Hitarth Choubisa and Yuan Gao and Wang, {Ya Kun} and Sagar, {Laxmi Kishore} and Bin Sun and Peicheng Li and Golam Bappi and Bin Chen and Jun Li and Yunkun Wang and Yitong Dong and Dongxin Ma and Yunan Gao and Yongchang Liu and Mingjian Yuan and Saidaminov, {Makhsud I.} and Sjoerd Hoogland and Lu, {Zheng Hong} and Sargent, {Edward H.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

month = apr,

day = "1",

doi = "10.1002/advs.201903213",

language = "English (US)",

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journal = "Advanced Science",

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Liang, H, Yuan, F, Johnston, A, Gao, C, Choubisa, H, Gao, Y, Wang, YK, Sagar, LK, Sun, B, Li, P, Bappi, G, Chen, B, Li, J, Wang, Y, Dong, Y, Ma, D, Gao, Y, Liu, Y, Yuan, M, Saidaminov, MI, Hoogland, S, Lu, ZH & Sargent, EH 2020, 'High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization', Advanced Science, vol. 7, no. 8, 1903213. https://doi.org/10.1002/advs.201903213

TY - JOUR

T1 - High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization

AU - Liang, Hongyan

AU - Yuan, Fanglong

AU - Johnston, Andrew

AU - Gao, Congcong

AU - Choubisa, Hitarth

AU - Gao, Yuan

AU - Wang, Ya Kun

AU - Sagar, Laxmi Kishore

AU - Sun, Bin

AU - Li, Peicheng

AU - Bappi, Golam

AU - Chen, Bin

AU - Li, Jun

AU - Wang, Yunkun

AU - Dong, Yitong

AU - Ma, Dongxin

AU - Gao, Yunan

AU - Liu, Yongchang

AU - Yuan, Mingjian

AU - Saidaminov, Makhsud I.

AU - Hoogland, Sjoerd

AU - Lu, Zheng Hong

AU - Sargent, Edward H.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)—the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V−1 with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H3PO2. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H3PO2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m−2; this is the record among reported red-emitting, lead-free PeLEDs.

AB - Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)—the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V−1 with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H3PO2. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H3PO2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m−2; this is the record among reported red-emitting, lead-free PeLEDs.

KW - HPO additives

KW - Sn stabilization

KW - Sn-based red light-emitting diodes

KW - antioxidation

KW - lead-free perovskites

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JO - Advanced Science

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ER -

High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization

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