Color-Stable Blue Light-Emitting Diodes Enabled by Effective Passivation of Mixed Halide Perovskites

Hongling Yu; Heyong Wang; Tiankai Zhang; Chang Yi; Guanhaojie Zheng; Chunyang Yin; Max Karlsson; Jiajun Qin; Jianpu Wang; Xiao Ke Liu; Feng Gao

doi:10.1021/acs.jpclett.1c01547

Color-Stable Blue Light-Emitting Diodes Enabled by Effective Passivation of Mixed Halide Perovskites

Hongling Yu, Heyong Wang, Tiankai Zhang, Chang Yi, Guanhaojie Zheng, Chunyang Yin, Max Karlsson, Jiajun Qin, Jianpu Wang, Xiao Ke Liu, Feng Gao

SCHOOL OF FLEXIBLE ELECTRONICS(FUTURE TECHNOLOGIES)|INSTITUTE OF ADVANCED MATERIALS(IAM)

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

33 Scopus citations

Abstract

Bandgap tuning through mixing halide anions is one of the most attractive features for metal halide perovskites. However, mixed halide perovskites usually suffer from phase segregation under electrical biases. Herein, we obtain high-performance and color-stable blue perovskite LEDs (PeLEDs) based on mixed bromide/chloride three-dimensional (3D) structures. We demonstrate that the color instability of CsPb(Br_1-xCl_x)₃PeLEDs results from surface defects at perovskite grain boundaries. By effective defect passivation, we achieve color-stable blue electroluminescence from CsPb(Br_1-xCl_x)₃PeLEDs, with maximum external quantum efficiencies of up to 4.5% and high luminance of up to 5351 cd m^-2in the sky-blue region (489 nm). Our work provides new insights into the color instability issue of mixed halide perovskites and can spur new development of high-performance and color-stable blue PeLEDs.

Original language	English
Pages (from-to)	6041-6047
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	12
DOIs	https://doi.org/10.1021/acs.jpclett.1c01547
State	Published - 2021

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title = "Color-Stable Blue Light-Emitting Diodes Enabled by Effective Passivation of Mixed Halide Perovskites",

abstract = "Bandgap tuning through mixing halide anions is one of the most attractive features for metal halide perovskites. However, mixed halide perovskites usually suffer from phase segregation under electrical biases. Herein, we obtain high-performance and color-stable blue perovskite LEDs (PeLEDs) based on mixed bromide/chloride three-dimensional (3D) structures. We demonstrate that the color instability of CsPb(Br1-xClx)3PeLEDs results from surface defects at perovskite grain boundaries. By effective defect passivation, we achieve color-stable blue electroluminescence from CsPb(Br1-xClx)3PeLEDs, with maximum external quantum efficiencies of up to 4.5% and high luminance of up to 5351 cd m-2in the sky-blue region (489 nm). Our work provides new insights into the color instability issue of mixed halide perovskites and can spur new development of high-performance and color-stable blue PeLEDs.",

author = "Hongling Yu and Heyong Wang and Tiankai Zhang and Chang Yi and Guanhaojie Zheng and Chunyang Yin and Max Karlsson and Jiajun Qin and Jianpu Wang and Liu, {Xiao Ke} and Feng Gao",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors. Published by American Chemical Society",

year = "2021",

doi = "10.1021/acs.jpclett.1c01547",

language = "英语",

volume = "12",

pages = "6041--6047",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

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T1 - Color-Stable Blue Light-Emitting Diodes Enabled by Effective Passivation of Mixed Halide Perovskites

AU - Yu, Hongling

AU - Wang, Heyong

AU - Zhang, Tiankai

AU - Yi, Chang

AU - Zheng, Guanhaojie

AU - Yin, Chunyang

AU - Karlsson, Max

AU - Qin, Jiajun

AU - Wang, Jianpu

AU - Liu, Xiao Ke

AU - Gao, Feng

PY - 2021

Y1 - 2021

N2 - Bandgap tuning through mixing halide anions is one of the most attractive features for metal halide perovskites. However, mixed halide perovskites usually suffer from phase segregation under electrical biases. Herein, we obtain high-performance and color-stable blue perovskite LEDs (PeLEDs) based on mixed bromide/chloride three-dimensional (3D) structures. We demonstrate that the color instability of CsPb(Br1-xClx)3PeLEDs results from surface defects at perovskite grain boundaries. By effective defect passivation, we achieve color-stable blue electroluminescence from CsPb(Br1-xClx)3PeLEDs, with maximum external quantum efficiencies of up to 4.5% and high luminance of up to 5351 cd m-2in the sky-blue region (489 nm). Our work provides new insights into the color instability issue of mixed halide perovskites and can spur new development of high-performance and color-stable blue PeLEDs.

AB - Bandgap tuning through mixing halide anions is one of the most attractive features for metal halide perovskites. However, mixed halide perovskites usually suffer from phase segregation under electrical biases. Herein, we obtain high-performance and color-stable blue perovskite LEDs (PeLEDs) based on mixed bromide/chloride three-dimensional (3D) structures. We demonstrate that the color instability of CsPb(Br1-xClx)3PeLEDs results from surface defects at perovskite grain boundaries. By effective defect passivation, we achieve color-stable blue electroluminescence from CsPb(Br1-xClx)3PeLEDs, with maximum external quantum efficiencies of up to 4.5% and high luminance of up to 5351 cd m-2in the sky-blue region (489 nm). Our work provides new insights into the color instability issue of mixed halide perovskites and can spur new development of high-performance and color-stable blue PeLEDs.

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U2 - 10.1021/acs.jpclett.1c01547

DO - 10.1021/acs.jpclett.1c01547

M3 - 文章

C2 - 34165316

AN - SCOPUS:85109664690

SN - 1948-7185

VL - 12

SP - 6041

EP - 6047

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

ER -

Color-Stable Blue Light-Emitting Diodes Enabled by Effective Passivation of Mixed Halide Perovskites

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