WFRF:(Shan Chongxin)
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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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- (creator_code:org_t)
- 2022-12-22
- 2023
- English.
- In: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 35:8
- Journal article (peer-reviewed)
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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- Zhang, Jibin
- Zhang, Tiankai
- Ma, Zhuangzhuang
- Yuan, Fanglong
- Zhou, Xin
- Wang, Heyong, 19 ...
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- Liu, Zhe
- Qing, Jian
- Chen, Hongting
- Li, Xinjian
- Su, Shijian
- Xie, Jianing
- Shi, Zhifeng
- Hou, Lintao
- Shan, Chongxin
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- NATURAL SCIENCES
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