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  • 1.
    Chen, Hongting
    et al.
    Huazhong Univ Sci and Technol, Peoples R China.
    Fan, Lianwei
    Huazhong Univ Sci and Technol, Peoples R China.
    Zhang, Rui
    Huazhong Univ Sci and Technol, Peoples R China.
    Bao, Chunxiong
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Zhao, Haifeng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Xiang, Wei
    Huazhong Univ Sci and Technol, Peoples R China.
    Liu, Wei
    Huazhong Univ Sci and Technol, Peoples R China.
    Niu, Guangda
    Huazhong Univ Sci and Technol, Peoples R China.
    Guo, Runda
    Huazhong Univ Sci and Technol, Peoples R China.
    Zhang, Louwen
    Huazhong Univ Sci and Technol, Peoples R China.
    Wang, Lei
    Huazhong Univ Sci and Technol, Peoples R China.
    High-Efficiency Formamidinium Lead Bromide Perovskite Nanocrystal-Based Light-Emitting Diodes Fabricated via a Surface Defect Self-Passivation Strategy2020In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 8, no 6, article id 1901390Article in journal (Refereed)
    Abstract [en]

    Formamidinium lead bromide (FAPbBr(3)) nanocrystals (NCs) demonstrate great potential in light-emitting diode (LED) applications due to their pure green emission and excellent stability. However, the abundant defects at the surface of the NCs act as charge trapping centers and significantly increase the trap-assisted nonradiative recombination channels, hampering the performance improvement of LEDs based on FAPbBr(3) NCs. Herein, a facile self-passivation strategy of the surface defects is developed by introducing excess formamidinium bromide (FABr) during the colloidal synthesis of NCs, leading to much improved photoluminescence quantum yield (PLQY) of the obtained NCs. In addition, enhanced charge transport property is measured in the assembled films owing to the simultaneously declined insulating ligands at the surface of NCs. The molar ratio of FABr and PbBr2 is rationally optimized during the synthesis of NCs and high-efficient green-emissive LEDs are fabricated with a champion current efficiency of 76.8 cd A(-1), corresponding to an external quantum efficiency of 17.1%, which is among the best-performing green LEDs based on perovskite NCs so far.

  • 2.
    Luo, Xiyu
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Tsinghua Univ, Peoples R China.
    Xu, Weidong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Northwestern Polytech Univ, Peoples R China.
    Zheng, Guanhaojie
    Chinese Acad Sci, Peoples R China.
    Tammireddy, Sandhya
    Tech Univ Chemnitz, Germany.
    Wei, Qi
    Hong Kong Polytech Univ, Peoples R China.
    Karlsson, Max
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zhang, Zhaojun
    Lund Univ, Sweden.
    Ji, Kangyu
    Univ Cambridge, England; Univ Cambridge, England.
    Kahmann, Simon
    Univ Cambridge, England; Univ Cambridge, England.
    Yin, Chunyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zou, Yatao
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zhang, Zeyu
    Beijing Univ Technol, Peoples R China.
    Chen, Huaiyu
    Lund Univ, Sweden.
    Marcal, Lucas A. B.
    Lund Univ, Sweden; Lund Univ, Sweden.
    Zhao, Haifeng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Ma, Dongxin
    Tsinghua Univ, Peoples R China.
    Zhang, Dongdong
    Tsinghua Univ, Peoples R China.
    Lu, Yue
    Beijing Univ Technol, Peoples R China.
    Li, Mingjie
    Hong Kong Polytech Univ, Peoples R China.
    Deibel, Carsten
    Tech Univ Chemnitz, Germany.
    Stranks, Samuel D.
    Univ Cambridge, England; Univ Cambridge, England.
    Duan, Lian
    Tsinghua Univ, Peoples R China.
    Wallentin, Jesper
    Lund Univ, Sweden.
    Huang, Wei
    Northwestern Polytech Univ, Peoples R China.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence2024In: Matter, ISSN 2590-2393, E-ISSN 2590-2385, Vol. 7, no 3Article in journal (Refereed)
    Abstract [en]

    Compositional heterogeneity is commonly observed in mixed bromide/iodide perovskite photoabsorbers, typically with minimal effects on charge carrier recombination and photovoltaic performance. Consistently, it has so far received very limited attention in bromide/chloride-mixed perovskites, which hold particular significance for blue light -emitting diodes. Here, we uncover that even a minor degree of localized halide heterogeneity leads to severe non -radiative losses in mixed bromide/chloride blue perovskite emitters, presenting a stark contrast to general observations in photovoltaics. We not only provide a visualization of the heterogeneity landscape spanning from micro -to sub-microscale but also identify that this issue mainly arises from the initially formed chloride -rich clusters during perovskite nucleation. Our work sheds light on a long-term neglected factor impeding the advancement of blue light -emitting diodes using mixed halide perovskites and provides a practical strategy to mitigate this issue.

  • 3.
    Zhao, Haifeng
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Univ Elect Sci & Technol China, Peoples R China.
    Chen, Hongting
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Jinan Univ, Peoples R China.
    Bai, Sai
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Zhejiang Univ, Peoples R China.
    Kuang, Chaoyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Luo, Xiyu
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Tsinghua Univ, Peoples R China.
    Teng, Pengpeng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Nanjing Univ Aeronaut & Astronaut, Peoples R China.
    Yin, Chunyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zeng, Peng
    Univ Elect Sci & Technol China, Peoples R China.
    Hou, Lintao
    Jinan Univ, Peoples R China.
    Yang, Ying
    Nanjing Univ Aeronaut & Astronaut, Peoples R China.
    Duan, Lian
    Tsinghua Univ, Peoples R China.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Liu, Mingzhen
    Univ Elect Sci & Technol China, Peoples R China.
    High-Brightness Perovskite Light-Emitting Diodes Based on FAPbBr(3) Nanocrystals with Rationally Designed Aromatic Ligands2021In: ACS Energy Letters, E-ISSN 2380-8195, Vol. 6, no 7, p. 2395-2403Article in journal (Refereed)
    Abstract [en]

    Despite rapid developments of light-emitting diodes (LEDs) based on emerging perovskite nanocrystals (PeNCs), it remains challenging to achieve devices with integrated high efficiencies and high brightness because of the insulating long-chain ligands used for the PeNCs. Herein, we develop highly luminescent and stable formamidinium lead bromide PeNCs capped with rationally designed short aromatic ligands of 2-naphthalenesulfonic acid (NSA) for LEDs. Compared with commonly used oleic acid ligands, the NSA molecules not only preserve the surface properties of the PeNCs during the purification but also notably improve the electrical properties of the assembled emissive layers, ensuring efficient charge injection/transport in the devices. The resulting champion LED with electroluminescence approaching the Rec. 2020 green primary color demonstrates a high brightness of 67 115 cd cm(-2) and a peak external quantum efficiency of 19.2%. More impressively, the device shows negligibly decreased efficiency at an elevated brightness of 20 000 cd cm(-2) and a well-retained efficiency of over 10% at around 65 000 cd cm(-2), presenting a breakthrough in LEDs based on PeNCs.

  • 4.
    Zhao, Haifeng
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Univ Elect Sci & Technol China, Peoples R China; Univ Elect Sci & Technol China, Peoples R China.
    Hu, Zhang-Jun
    Linköping University, Department of Physics, Chemistry and Biology, Molecular Surface Physics and Nano Science. Linköping University, Faculty of Science & Engineering.
    Wei, Linfeng
    Univ Elect Sci & Technol China, Peoples R China; Univ Elect Sci & Technol China, Peoples R China.
    Zeng, Peng
    Univ Elect Sci & Technol China, Peoples R China; Univ Elect Sci & Technol China, Peoples R China.
    Kuang, Chaoyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Liu, Xiaochun
    Univ Elect Sci & Technol China, Peoples R China; Univ Elect Sci & Technol China, Peoples R China.
    Bai, Sai
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Liu, Mingzhen
    Univ Elect Sci & Technol China, Peoples R China; Univ Elect Sci & Technol China, Peoples R China.
    Efficient and High-Luminance Perovskite Light-Emitting Diodes Based on CsPbBr3 Nanocrystals Synthesized from a Dual-Purpose Organic Lead SourceIn: Small, ISSN 1613-6810, E-ISSN 1613-6829, article id 2003939Article in journal (Refereed)
    Abstract [en]

    Rational engineering of the surface properties of perovskite nanocrystals (PeNCs) is critical to obtain light emitters with simultaneous high photoluminescence efficiency and excellent charge transport properties for light-emitting diodes (LEDs). However, the commonly used lead halide sources make it hard to rationally optimize the surface compositions of the PeNCs. In addition, previously developed ligand engineering strategies for conventional inorganic nanocrystals easily deteriorate surface properties of the PeNCs, bringing additional difficulties in optimizing their optoelectronic properties. In this work, a novel strategy of employing a dual-purpose organic lead source for the synthesis of highly luminescent PeNCs with enhanced charge transport property is developed. Lead naphthenate (Pb(NA)(2)), of which the metal ions work as lead sources while the naphthenate can function as the surface ligands afterward, is explored and the obtained products under different synthesis conditions are comprehensively investigated. Monodispersed cesium lead bromide (CsPbBr3) with controllable size and excellent optical properties, showing superior photoluminescence quantum yields up to 80%, is obtained. Based on the simultaneously enhanced electrical properties of the Pb(NA)(2)-derived PeNCs, the resultant LEDs demonstrate a high peak external quantum efficiency of 8.44% and a superior maximum luminance of 31 759 cd cm(-2).

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