Pyridine-Based Electron-Transport Materials with High Solubility, Excellent Film-Forming Ability, and Wettability for Inkjet-Printed OLEDs
| Autor: | Jinyong Zhuang, Wenming Su, Changting Wei, Dong-Fang Yang, Dongyu Zhang, Zhongzhi Xie, Zheng Cui, Haibo Zeng, Wenrui Guo, Jian-Xin Tang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Ether 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Electron transport chain 0104 chemical sciences chemistry.chemical_compound chemistry Pyridine OLED General Materials Science Wetting Solubility 0210 nano-technology HOMO/LUMO Diode |
| Zdroj: | ACS applied materialsinterfaces. 9(44) |
| ISSN: | 1944-8252 |
| Popis: | Film morphology has predominant influence on the performance of multilayered organic light-emitting diodes (OLEDs), whereas there is little reported literature from the angle of the molecular level to investigate the impact on film-forming ability and device performance. In this work, four isomeric cross-linkable electron-transport materials constructed with pyridine, 1,2,4-triazole, and vinylbenzyl ether groups were developed for inkjet-printed OLEDs. Their lowest unoccupied molecular orbital (∼3.20 eV) and highest occupied molecular orbital (∼6.50 eV) levels are similar, which are mainly determined by the 1,2,4-triazole groups. The triplet energies of these compounds can be tuned from 2.51 to 2.82 eV by different coupling modes with the core of pyridine, where the 2,6-pyridine-based compound has the highest value of 2.82 eV. Film formation and solubility of the compounds were investigated. It was found that the 2,6-pyridine-based compound outperformed the 2,4-pyridine, 2,5-pyridine, and 3,5-pyridine-based compounds. The spin-coated blue OLEDs based on the four compounds have achieved over 14.0% external quantum efficiencies (EQEs) at the luminance of 100 cd m |
| Databáze: | OpenAIRE |
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