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  • 1.
    Bao, Chunxiong
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Shenzhen Univ, Peoples R China.
    Xu, Weidong
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Nanjing Tech Univ NanjingTech, Peoples R China.
    Yang, Jie
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Shenzhen Univ, Peoples R China.
    Bai, Sai
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Teng, Pengpeng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Nanjing Univ Aeronaut and Astronaut, Peoples R China.
    Yang, Ying
    Nanjing Univ Aeronaut and Astronaut, Peoples R China.
    Wang, Jianpu
    Nanjing Tech Univ NanjingTech, Peoples R China.
    Zhao, Ni
    Chinese Univ Hong Kong, Peoples R China.
    Zhang, Wenjing
    Shenzhen Univ, Peoples R China.
    Huang, Wei
    Nanjing Tech Univ NanjingTech, Peoples R China; NPU, Peoples R China.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Bidirectional optical signal transmission between two identical devices using perovskite diodes2020In: NATURE ELECTRONICS, ISSN 2520-1131, Vol. 3, no 3, p. 156-164Article in journal (Refereed)
    Abstract [en]

    A solution-processed perovskite diode that functions as both optical transmitter and receiver can be used to build a monolithic pulse sensor and a bidirectional optical communication system. The integration of optical signal generation and reception into one device-thus allowing a bidirectional optical signal transmission between two identical devices-is of value in the development of miniaturized and integrated optoelectronic devices. However, conventional solution-processable semiconductors have intrinsic material and design limitations that prevent them from being used to create such devices with a high performance. Here we report an efficient solution-processed perovskite diode that is capable of working in both emission and detection modes. The device can be switched between modes by changing the bias direction, and it exhibits light emission with an external quantum efficiency of over 21% and a light detection limit on a subpicowatt scale. The operation speed for both functions can reach tens of megahertz. Benefiting from the small Stokes shift of perovskites, our diodes exhibit a high specific detectivity (more than 2 x 10(12) Jones) at its peak emission (~804 nm), which allows an optical signal exchange between two identical diodes. To illustrate the potential of the dual-functional diode, we show that it can be used to create a monolithic pulse sensor and a bidirectional optical communication system.

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  • 2.
    Karlsson, Max
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Yi, Ziyue
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Univ Cambridge, England.
    Reichert, Sebastian
    Tech Univ Chemnitz, Germany.
    Luo, Xiyu
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Tsinghua Univ Beijing, Peoples R China.
    Lin, Weihua
    Lund Univ, Sweden.
    Zhang, Zeyu
    Beijing Univ Technol, Peoples R China.
    Bao, Chunxiong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zhang, Rui
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Bai, Sai
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zheng, Guanhaojie
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Teng, Pengpeng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Duan, Lian
    Tsinghua Univ Beijing, Peoples R China.
    Lu, Yue
    Beijing Univ Technol, Peoples R China.
    Zheng, Kaibo
    Lund Univ, Sweden; Tech Univ Denmark, Denmark.
    Pullerits, Tonu
    Lund Univ, Sweden.
    Deibel, Carsten
    Tech Univ Chemnitz, Germany.
    Xu, Weidong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Friend, Richard
    Univ Cambridge, England.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Mixed halide perovskites for spectrally stable and high-efficiency blue light-emitting diodes2021In: Nature Communications, E-ISSN 2041-1723, Vol. 12, no 1, article id 361Article in journal (Refereed)
    Abstract [en]

    Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition is straightforward to achieve blue emission, practical implementation of this strategy has been challenging due to poor colour stability and severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content needed to produce blue emission. Here, we solve these critical challenges in mixed halide perovskites and demonstrate spectrally stable blue perovskite light-emitting diodes over a wide range of emission wavelengths from 490 to 451 nanometres. The emission colour is directly tuned by modifying the halide composition. Particularly, our blue and deep-blue light-emitting diodes based on three-dimensional perovskites show high EQE values of 11.0% and 5.5% with emission peaks at 477 and 467nm, respectively. These achievements are enabled by a vapour-assisted crystallization technique, which largely mitigates local compositional heterogeneity and ion migration. Achieving bright and efficient blue emission in metal halide perovskite light-emitting diodes has proven to be challenging. Here, the authors demonstrate high EQE and spectrally stable blue light-emitting diodes based on mixed halide perovskites, with emission from 490 to 451nm by using a vapour-assisted crystallization technique.

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  • 3.
    Teng, Pengpeng
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Nanjing Univ Aeronaut & Astronaut, Peoples R China; Nanjing Univ Aeronaut & Astronaut, Sweden.
    Reichert, Sebastian
    Tech Univ Chemnitz, Germany.
    Xu, Weidong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Yang, Shih-Chi
    Swiss Fed Labs Mat Sci & Technol, Switzerland.
    Fu, Fan
    Swiss Fed Labs Mat Sci & Technol, Switzerland.
    Zou, Yatao
    Soochow Univ, Peoples R China.
    Yin, Chunyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Bao, Chunxiong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Karlsson, Max
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Liu, Xianjie
    Norrkoping Univ, Sweden.
    Qin, Jiajun
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Yu, Tao
    Nanjing Univ, Peoples R China.
    Tress, Wolfgang
    Zurich Univ Appl Sci, Switzerland.
    Yang, Ying
    Nanjing Univ Aeronaut & Astronaut, Peoples R China; Nanjing Univ Aeronaut & Astronaut, Sweden.
    Sun, Baoquan
    Soochow Univ, Peoples R China.
    Deibel, Carsten
    Tech Univ Chemnitz, Germany.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Degradation and self-repairing in perovskite light-emitting diodes2021In: Matter, ISSN 2590-2393, E-ISSN 2590-2385, Vol. 4, no 11, p. 3710-3724Article in journal (Refereed)
    Abstract [en]

    One of the most critical challenges in perovskite light-emitting diodes (PeLEDs) lies in poor operational stability. Although field dependent ion migration is believed to play an important role in the operation of perovskite optoelectronic devices, a complete understanding of how it affects the stability of PeLEDs is still missing. Here, we report a unique self-repairing behavior that the electroluminescence of moderately degraded PeLEDs can almost completely restore to their initial performance after resting. We find that the accumulated halides within the hole transport layer undergo back diffusion toward the surface of the perovskite layer during resting, repairing the vacancies and thus resulting in electroluminescence recovery. These findings indicate that one of the dominant degradation pathways in PeLEDs is the generation of halide vacancies at perovskite/hole transport layer interface during operation. We thus further passivate this key interface, which results in a high external quantum efficiency of 22.8% and obviously improved operational stability.

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  • 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.
    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.

  • 5.
    Zou, Yatao
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Soochow 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.
    Xu, Weidong
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Zheng, Guanhaojie
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
    Lin, Weihua
    Lund Univ, Sweden.
    Yin, Jun
    King Abdullah Univ Sci & Technol, Saudi Arabia.
    Kobera, Libor
    Czech Acad Sci, Czech Republic.
    Abbrent, Sabina
    Czech Acad Sci, Czech Republic.
    Li, Xiangchun
    Nanjing Univ Posts & Telecommun, Peoples R China.
    Steele, Julian A.
    Katholieke Univ Leuven, Belgium.
    Solano, Eduardo
    Alba Synchrotron Light Source, Spain.
    Roeffaers, Maarten B. J.
    Katholieke Univ Leuven, Belgium.
    Li, Jun
    Lund Univ, Sweden.
    Cai, Lei
    Soochow Univ, Peoples R China.
    Kuang, Chaoyang
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Scheblykin, Ivan G.
    Lund Univ, Sweden.
    Brus, Jiri
    Czech Acad Sci, Czech Republic.
    Zheng, Kaibo
    Lund Univ, Sweden; Tech Univ Denmark, Denmark.
    Yang, Ying
    Nanjing Univ Aeronaut & Astronaut, Peoples R China.
    Mohammed, Omar F.
    King Abdullah Univ Sci & Technol, Saudi Arabia.
    Bakr, Osman M.
    King Abdullah Univ Sci & Technol, Saudi Arabia.
    Pullerits, Tönu
    Lund Univ, Sweden.
    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.
    Sun, Baoquan
    Soochow Univ, Peoples R China.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Manipulating crystallization dynamics through chelating molecules for bright perovskite emitters2021In: Nature Communications, E-ISSN 2041-1723, Vol. 12, no 1, article id 4831Article in journal (Refereed)
    Abstract [en]

    Multidentate molecular additives are widely used to passivate perovskite, yet the role of chelate effect is still unclear. Here, the authors investigate a wide range of additives with different coordination number and functional moieties to establish correlation between coordination affinity and perovskite crystallisation dynamics. Molecular additives are widely utilized to minimize non-radiative recombination in metal halide perovskite emitters due to their passivation effects from chemical bonds with ionic defects. However, a general and puzzling observation that can hardly be rationalized by passivation alone is that most of the molecular additives enabling high-efficiency perovskite light-emitting diodes (PeLEDs) are chelating (multidentate) molecules, while their respective monodentate counterparts receive limited attention. Here, we reveal the largely ignored yet critical role of the chelate effect on governing crystallization dynamics of perovskite emitters and mitigating trap-mediated non-radiative losses. Specifically, we discover that the chelate effect enhances lead-additive coordination affinity, enabling the formation of thermodynamically stable intermediate phases and inhibiting halide coordination-driven perovskite nucleation. The retarded perovskite nucleation and crystal growth are key to high crystal quality and thus efficient electroluminescence. Our work elucidates the full effects of molecular additives on PeLEDs by uncovering the chelate effect as an important feature within perovskite crystallization. As such, we open new prospects for the rationalized screening of highly effective molecular additives.

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  • 6.
    Zou, Yatao
    et al.
    Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, China .
    Teng, Pengpeng
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
    Yuan, Zhongcheng
    Linköping University, Faculty of Science & Engineering. Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials.
    Hu, Jingcong
    Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, China.
    Lu, Yue
    Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, China.
    Sun, Baoquan
    Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, China; Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, China.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Xu, Weidong
    Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi’an, China.
    Protocol for efficient and self-healing near-infrared perovskite light-emitting diodes.2022In: STAR protocols, ISSN 2666-1667, Vol. 3, no 3, article id 101631Article in journal (Refereed)
    Abstract [en]

    Preparation of highly efficient and stable perovskite light-emitting diodes (PeLEDs) with reproducible device performance is challenging. This protocol describes steps for fabrication of high-performance and self-healing PeLEDs. These include instructions for synthesis of charge-transporting zinc oxide (ZnO) nanocrystals, step-by-step device fabrication, and control over self-healing of the degraded devices. For complete details on the use and execution of this protocol, please refer to Teng et al. (2021).

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