https://scholars.lib.ntu.edu.tw/handle/123456789/580764
標題: | Rational design of perfectly oriented thermally activated delayed fluorescence emitter for efficient red electroluminescence [具有完美水平取向的?光型?活化延??光材料] | 作者: | Zeng X CHUNG-CHIH WU |
關鍵字: | Efficiency; Fluorescence; Molecular orientation; Organic light emitting diodes (OLED); Dipole orientation; External quantum efficiency; Organic emitters; Organic light emitting diodes(OLEDs); Out-coupling efficiency; Red electroluminescence; Thermally activated delayed fluorescences; Transition dipole moments; Electroluminescence | 公開日期: | 2021 | 卷: | 64 | 期: | 4 | 起(迄)頁: | 920-930 | 來源出版物: | Science China Materials | 摘要: | How to control the dipole orientation of organic emitters is a challenge in the field of organic light-emitting diodes (OLEDs). Herein, a linear thermally activated delayed fluorescence (TADF) molecule, PhNAI-PMSBA, bearing a 1,8-naphthalimide-acridine framework was designed by a double-site long-axis extension strategy to actively control the dipole orientation. The horizontal ratio of emitting dipole orientation of PhNAI-PMSBA reaches 95%, substantially higher than that of isotropic emitters (67%). This unique feature is associated with the intrinsically horizontal molecular orientation of PhNAI-PMSBA and the good agreement between its transition dipole moment direction and molecular long axis. The PhNAI-PMSBA-based OLED achieves an ultrahigh optical outcoupling efficiency of 43.2% and thus affords one of the highest red electroluminescence with an external quantum efficiency of 22.3% and the Commission International de l’Eclairage 1931 coordinates at around (0.60, 0.40). ? 2020, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096075176&doi=10.1007%2fs40843-020-1501-1&partnerID=40&md5=fa404360cf66ec21544b1cec68d6b031 https://scholars.lib.ntu.edu.tw/handle/123456789/580764 |
ISSN: | 20958226 | DOI: | 10.1007/s40843-020-1501-1 |
顯示於: | 電機工程學系 |
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