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  • 1.
    Karlsson, Max
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Qin, Jiajun
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Niu, Kaifeng
    Linköping University, Department of Physics, Chemistry and Biology, Materials design. 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.
    Rosén, Johanna
    Linköping University, Department of Physics, Chemistry and Biology, Materials design. Linköping University, Faculty of Science & Engineering.
    Björk, Jonas
    Linköping University, Department of Physics, Chemistry and Biology, Materials design. Linköping University, Faculty of Science & Engineering.
    Duan, Lian
    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.
    Gao, Feng
    Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
    Role of chloride on the instability of blue emitting mixed-halide perovskites2023In: FRONTIERS OF OPTOELECTRONICS, ISSN 2095-2759, Vol. 16, no 1, article id 37Article in journal (Refereed)
    Abstract [en]

    Although perovskite light-emitting diodes (PeLEDs) have seen unprecedented development in device efficiency over the past decade, they suffer significantly from poor operational stability. This is especially true for blue PeLEDs, whose operational lifetime remains orders of magnitude behind their green and red counterparts. Here, we systematically investigate this efficiency-stability discrepancy in a series of green- to blue-emitting PeLEDs based on mixed Br/Cl-perovskites. We find that chloride incorporation, while having only a limited impact on efficiency, detrimentally affects device stability even in small amounts. Device lifetime drops exponentially with increasing Cl-content, accompanied by an increased rate of change in electrical properties during operation. We ascribe this phenomenon to an increased mobility of halogen ions in the mixed-halide lattice due to an increased chemically and structurally disordered landscape with reduced migration barriers. Our results indicate that the stability enhancement for PeLEDs might require different strategies from those used for improving efficiency.

  • 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.
    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.

  • 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.

1 - 4 of 4
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