https://scholars.lib.ntu.edu.tw/handle/123456789/607049
標題: | Quinazoline-based thermally activated delayed fluorescence emitters for high-performance organic light-emitting diodes with external quantum efficiencies about 28% | 作者: | Li P Xiang Y Gong S Lee W.-K Huang Y.-H Wang C.-Y Yang C CHUNG-CHIH WU |
關鍵字: | Efficiency;Fluorescence;Quantum efficiency;Emitting layer;External quantum efficiency;Organic emitters;Performance;Phenoxazines;Photoluminescence quantum yields;Preferential orientation;Pyridyl groups;Quinazolines;Thermally activated delayed fluorescences;Organic light emitting diodes (OLED) | 公開日期: | 2021 | 卷: | 9 | 期: | 37 | 起(迄)頁: | 12633-12641 | 來源出版物: | Journal of Materials Chemistry C | 摘要: | Incorporating both preferential orientation of organic emitters in the emitting layer and high photoluminescence quantum yield (PLQY) is a challenging issue in the organic light-emitting diode (OLED) field. In this study, a green thermally activated delayed fluorescence (TADF) emitter 10-(4-(2-(3,5-di(pyridin-2-yl)phenyl)quinazolin-4-yl)phenyl)-10H-phenoxazine (2DPyPh-Qz) containing two 2-pyridyl groups to give both preferential emissive dipole orientation and high PLQY was developed based on a phenoxazine electron donor segment and a quinazoline electron acceptor segment. This new emitter has a higher horizontal dipole ratio of 79% and a higher PLQY of 96% compared to the reference emitter when doped in a host film. OLEDs fabricated with this emitter achieved good external quantum efficiency of ?28% and current efficiency of 89.9 cd A?1, which are competitive figures among quinazoline-based TADF emitters. ? The Royal Society of Chemistry 2021. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116239521&doi=10.1039%2fd1tc02633j&partnerID=40&md5=019b204bcbf24ea299ceea28d9c0dc43 https://scholars.lib.ntu.edu.tw/handle/123456789/607049 |
ISSN: | 20507534 | DOI: | 10.1039/d1tc02633j |
顯示於: | 電機工程學系 |
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