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A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
| Content Provider | MDPI |
|---|---|
| Author | Park, Jong Hyun Jang, Chung Hyeon Jung, Eui Dae Lee, Seungjin Song, Myoung Hoon Lee, Bo Ram |
| Copyright Year | 2020 |
| Description | 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. |
| Starting Page | 6689 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en13246689 |
| Journal | Energies |
| Issue Number | 24 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-12-18 |
| Access Restriction | Open |
| Subject Keyword | Energies Inorganic Chemistry Perovskite Light-emitting Diodes Blue Emission Device Stability A-site Cation Halide Segregation |
| Content Type | Text |
| Resource Type | Article |
