A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
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- A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
- Park, Jong Hyun; Jang, Chung Hyeon; Jung, Eie Dae; Lee, Seungjin; Song, Myoung Hoon; Lee, Bo Ram
- Issue Date
- Multidisciplinary Digital Publishing Institute (MDPI)
- ENERGIES, v.13, no.25, pp.6689
- 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/cm2.
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