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

Jong Hyun Park, Chung Hyeon Jang, Eui Dae Jung, Seungjin Lee, Myoung Hoon Song and Bo Ram Lee
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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

Energies, 2020, vol. 13, issue 24, 1-8

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 .

Keywords: perovskite light-emitting diodes; blue emission; device stability; A-site cation; halide segregation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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