A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
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 (P...
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MDPI AG
2020-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/24/6689 |
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| author | Jong Hyun Park Chung Hyeon Jang Eui Dae Jung Seungjin Lee Myoung Hoon Song Bo Ram Lee |
| author_facet | Jong Hyun Park Chung Hyeon Jang Eui Dae Jung Seungjin Lee Myoung Hoon Song Bo Ram Lee |
| author_sort | Jong Hyun Park |
| collection | DOAJ |
| 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<sup>−</sup>) and bromide (Br<sup>−</sup>), 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<sup>2</sup>. |
| first_indexed | 2024-03-10T13:58:08Z |
| format | Article |
| id | doaj.art-67916487b3684624bf358b984ce1211f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:58:08Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-67916487b3684624bf358b984ce1211f2023-11-21T01:25:23ZengMDPI AGEnergies1996-10732020-12-011324668910.3390/en13246689A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting DiodesJong Hyun Park0Chung Hyeon Jang1Eui Dae Jung2Seungjin Lee3Myoung Hoon Song4Bo Ram Lee5School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaDepartment of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 3G4, CanadaSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, KoreaDepartment of Physics, Pukyong National University, Busan 48513, KoreaMetal 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<sup>−</sup>) and bromide (Br<sup>−</sup>), 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<sup>2</sup>.https://www.mdpi.com/1996-1073/13/24/6689perovskite light-emitting diodesblue emissiondevice stabilityA-site cationhalide segregation |
| spellingShingle | Jong Hyun Park Chung Hyeon Jang Eui Dae Jung Seungjin Lee Myoung Hoon Song Bo Ram Lee A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes Energies perovskite light-emitting diodes blue emission device stability A-site cation halide segregation |
| title | A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes |
| title_full | A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes |
| title_fullStr | A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes |
| title_full_unstemmed | A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes |
| title_short | A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes |
| title_sort | a site cation engineering for efficient blue emissive perovskite light emitting diodes |
| topic | perovskite light-emitting diodes blue emission device stability A-site cation halide segregation |
| url | https://www.mdpi.com/1996-1073/13/24/6689 |
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