Conjugation-Induced Thermally Activated Delayed Fluorescence: Photophysics of a Carbazole-Benzophenone Monomer-to-Tetramer Molecular Series
文献类型：期刊论文
| 作者 | Wei, Qiang; Imbrasas, Paulius; Caldera-Cruz, Enrique; Cao, Liang; Fei, Nanan; Thomas, Heidi; Scholz, Reinhard; Lenk, Simone; Voit, Brigitte; Reineke, Sebastian |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY A
 |
| 出版日期 | 2021 |
| 卷号 | 125期号:6页码:1345-1354 |
| 英文摘要 | Materials exhibiting thermally activated delayed fluorescence (TADF) have been extensively explored in the last decade. These emitters have great potential of being used in organic light-emitting diodes because they allow for high quantum efficiencies by utilizing triplet states via reverse intersystem crossing. In small molecules, this is done by spatially separating the highest occupied molecular orbital from the lowest unoccupied molecular orbital, forming an intramolecular charge-transfer (iCT) state and leading to a small energy difference between lowest excited singlet and triplet states (Delta E-ST). However, in polymer emitters, this is harder to achieve, and typical strategies usually include adding known TADF units as sidechains onto a polymer backbone. In a previous work, we proposed an alternative way to achieve a TADF polymer by repeating a non-TADF unit, polymerizing it via electron-donating carbazole moieties. The extended conjugation on the backbone reduced the Delta E-ST and allowed for an efficient TADF polymer. In this work, we present a more in-depth study of the shift from a non-TADF monomer to TADF oligomers. The monomer shows non-TADF emission, and we find the delayed emission to be of triplet-triplet annihilation origin. An iCT state is formed already in the dimer, leading to a much more efficient TADF emission. This is confirmed by an almost two-fold increase of photoluminescence quantum yield, a decrease in the delayed luminescence lifetime, and the respective spectral lineshapes of the molecules. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22182]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | 1.Ge, ZY (corresponding author), Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China. 2.Ge, ZY (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 3.Reineke, S (corresponding author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, D-01062 Dresden, Germany. 4.Voit, B (corresponding author), Tech Univ Dresden, Organ Chem Polymers, D-01062 Dresden, Germany. 5.Reineke, S (corresponding author), Tech Univ Dresden, Inst Appl Phys, D-01062 Dresden, Germany. 6.Voit, B (corresponding author), Leibniz Inst Polymerforsch Dresden eV, D-01069 Dresden, Germany. |
| 推荐引用方式 GB/T 7714 | Wei, Qiang,Imbrasas, Paulius,Caldera-Cruz, Enrique,et al. Conjugation-Induced Thermally Activated Delayed Fluorescence: Photophysics of a Carbazole-Benzophenone Monomer-to-Tetramer Molecular Series[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2021,125(6):1345-1354. |
| APA | Wei, Qiang.,Imbrasas, Paulius.,Caldera-Cruz, Enrique.,Cao, Liang.,Fei, Nanan.,...&Ge, Ziyi.(2021).Conjugation-Induced Thermally Activated Delayed Fluorescence: Photophysics of a Carbazole-Benzophenone Monomer-to-Tetramer Molecular Series.JOURNAL OF PHYSICAL CHEMISTRY A,125(6),1345-1354. |
| MLA | Wei, Qiang,et al."Conjugation-Induced Thermally Activated Delayed Fluorescence: Photophysics of a Carbazole-Benzophenone Monomer-to-Tetramer Molecular Series".JOURNAL OF PHYSICAL CHEMISTRY A 125.6(2021):1345-1354. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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