| Autor: |
Ryosuke Okumura, Yu Kusakabe, Florian Rauch, Lukas Lubczyk, Katsuaki Suzuki, Todd B. Marder, Hironori Kaji |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Applied Physics Express, Vol 17, Iss 4, p 041003 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1882-0786 |
| DOI: |
10.35848/1882-0786/ad392a |
| Popis: |
Efficient reverse intersystem crossing (RISC) is an important process for thermally activated delayed fluorescence (TADF) to suppress efficiency roll-off in organic LEDs (OLEDs). Enhancing spin–orbit coupling is effective for fast RISC and is achieved by mediating a locally excited triplet state when RISC occurs between charge transfer states. Here, we experimentally confirmed that efficient RISC occurred in triarylborane-based TADF emitters named Phox- ^Me π , Phox- ^MeO π , and ^MeO3 Ph- ^FMe π . The three emitters showed large RISC rate constants exceeding 10 ^6 s ^−1 . The Phox- ^Me π -based OLED exhibited higher maximum external quantum efficiency (EQE _max = 10.0%) compared to the Phox- ^MeO π -based OLED (EQE _max = 6.7%). |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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