Organic Light-Emitting Diodes Based on Conjugation-Induced Thermally Activated Delayed Fluorescence Polymers: Interplay Between Intra- and Intermolecular Charge Transfer States
| العنوان: | Organic Light-Emitting Diodes Based on Conjugation-Induced Thermally Activated Delayed Fluorescence Polymers: Interplay Between Intra- and Intermolecular Charge Transfer States |
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| المؤلفون: | Yungui Li, Qiang Wei, Liang Cao, Felix Fries, Matteo Cucchi, Zhongbin Wu, Reinhard Scholz, Simone Lenk, Brigitte Voit, Ziyi Ge, Sebastian Reineke |
| المصدر: | Frontiers in Chemistry Frontiers in Chemistry, Vol 7 (2019) |
| بيانات النشر: | Frontiers Media SA, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | thermally activated delayed fluorescence, Photoluminescence, Materials science, Quantum yield, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, 7. Clean energy, exciplex, lcsh:Chemistry, charge-transfer state, OLED, Original Research, chemistry.chemical_classification, Intermolecular force, General Chemistry, Polymer, organic light-emitting diodes, 021001 nanoscience & nanotechnology, Fluorescence, 0104 chemical sciences, electroluminescent polymer, Chemistry, lcsh:QD1-999, chemistry, Intramolecular force, Quantum efficiency, 0210 nano-technology |
| الوصف: | In this work, interactions between different host materials and a blue TADF polymer named P1 are systematically investigated. In photoluminescence, the host can have substantial impact on the photoluminescence quantum yield (PLQY) and the intensity of delayed fluorescence (ΦDF), where more than three orders of magnitude difference of ΦDF in various hosts is observed, resulting from a polarity effect of the host material and energy transfer. Additionally, an intermolecular charge-transfer (CT) emission with pronounced TADF characteristics is observed between P1 and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), with a singlet-triplet splitting of 7 meV. It is noted that the contribution of harvested triplets in monochrome organic light-emitting diodes (OLEDs) correlates with ΦDF. For devices based on intermolecular CT-emission, the harvested triplets contribute ~90% to the internal quantum efficiency. The results demonstrate the vital importance of host materials on improving the PLQY and sensitizing ΦDF of TADF polymers for efficient devices. Solution-processed polychrome OLEDs with a color close to a white emission are presented, with the emission of intramolecular (P1) and intermolecular TADF (PO-T2T:P1). |
| تدمد: | 2296-2646 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3a67453077f8f23c7e71e1ba344cbe5Test https://doi.org/10.3389/fchem.2019.00688Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c3a67453077f8f23c7e71e1ba344cbe5 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 22962646 |
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