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A Multifunctional "...
A Multifunctional "Halide-Equivalent" Anion Enabling Efficient CsPb(Br/I)(3) Nanocrystals Pure-Red Light-Emitting Diodes with External Quantum Efficiency Exceeding 23%
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- Zhang, Jibin (author)
- Zhengzhou Univ, Peoples R China; Jinan Univ, Peoples R China
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- Zhang, Tiankai (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten
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- Ma, Zhuangzhuang (author)
- Zhengzhou Univ, Peoples R China
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- Yuan, Fanglong (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Beijing Normal Univ, Peoples R China
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- Zhou, Xin (author)
- Jinan Univ, Peoples R China
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- Wang, Heyong, 1989- (author)
- Linköpings universitet,Elektroniska och fotoniska material,Tekniska fakulteten,Ist Italiano Tecnol, Italy
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- Liu, Zhe (author)
- South China Univ Technol, Peoples R China
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- Qing, Jian (author)
- Jinan Univ, Peoples R China
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- Chen, Hongting (author)
- Jinan Univ, Peoples R China
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- Li, Xinjian (author)
- Zhengzhou Univ, Peoples R China
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- Su, Shijian (author)
- South China Univ Technol, Peoples R China
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- Xie, Jianing (author)
- Foshan Univ, Peoples R China
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- Shi, Zhifeng (author)
- Zhengzhou Univ, Peoples R China
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- Hou, Lintao (author)
- Jinan Univ, Peoples R China
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- Shan, Chongxin (author)
- Zhengzhou Univ, Peoples R China
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(creator_code:org_t)
- 2022-12-22
- 2023
- English.
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In: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 35:8
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I)(3) nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability on account of the surface halide vacancies-induced nonradiative recombination loss, halide phase segregation, and self-doping effect. Herein, a "halide-equivalent" anion of benzenesulfonate (BS-) is introduced into CsPb(Br/I)(3) NCs as multifunctional additive to simultaneously address the above challenging issues. Joint experiment-theory characterizations reveal that the BS- can not only passivate the uncoordinated Pb2+-related defects at the surface of NCs, but also increase the formation energy of halide vacancies. Moreover, because of the strong electron-withdrawing property of sulfonate group, electrons are expected to transfer from the CsPb(Br/I)(3) NC to BS- for reducing the self-doping effect and altering the n-type behavior of CsPb(Br/I)(3) NCs to near ambipolarity. Eventually, synergistic boost in device performance is achieved for pure-red PeLEDs with CIE coordinates of (0.70, 0.30) and a champion external quantum efficiency of 23.5%, which is one of the best value among the ever-reported red PeLEDs approaching to the Rec. 2020 red primary color. Moreover, the BS--modified PeLED exhibits negligible wavelength shift under different operating voltages. This strategy paves an efficient way for improving the efficiency and stability of pure-red PeLEDs.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- CsPb(Br; I)(3) nanocrystals; halide vacancies; phase separation; pure-red light-emitting diodes; self-doping effect
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Zhang, Jibin
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Zhang, Tiankai
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Ma, Zhuangzhuang
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Yuan, Fanglong
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Zhou, Xin
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Wang, Heyong, 19 ...
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Liu, Zhe
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Qing, Jian
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Chen, Hongting
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Li, Xinjian
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Su, Shijian
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Xie, Jianing
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Shi, Zhifeng
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Hou, Lintao
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Shan, Chongxin
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Advanced Materia ...
- By the university
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Linköping University