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A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes

Author

Listed:
  • Jong Hyun Park

    (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

  • Chung Hyeon Jang

    (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

  • Eui Dae Jung

    (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

  • Seungjin Lee

    (Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 3G4, Canada)

  • Myoung Hoon Song

    (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

  • Bo Ram Lee

    (Department of Physics, Pukyong National University, Busan 48513, Korea)

Abstract

Metal halide perovskites have been investigated for the next-generation light-emitting materials because of their advantages such as high photoluminescence quantum yield (PLQY), excellent color purity, and facile color tunability. Recently, red- and green-emissive perovskite light-emitting diodes (PeLEDs) have shown an external quantum efficiency (EQE) of over 20%, whereas there is still room for improvement for blue emissive PeLEDs. By controlling the halide compositions of chloride (Cl − ) and bromide (Br − ), the bandgap of perovskites can be easily tuned for blue emission. However, halide segregation easily occurrs in the mixed-halide perovskite under light irradiation and LED operation because of poor phase stability. Here, we explore the effect of A-site cation engineering on the phase stability of the mixed-halide perovskites and find that a judicious selection of low dipole moment A cation (formamidinium or cesium) suppresses the halide segregation. This enables efficient bandgap tuning and electroluminescence stability for sky blue emissive PeLEDs over the current density of 15 mA/cm 2 .

Suggested Citation

  • Jong Hyun Park & Chung Hyeon Jang & Eui Dae Jung & Seungjin Lee & Myoung Hoon Song & Bo Ram Lee, 2020. "A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes," Energies, MDPI, vol. 13(24), pages 1-8, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6689-:d:464258
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    References listed on IDEAS

    as
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