期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 44, 页码 38716-38727出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12190
关键词
inkjet printing; electron-transport material; cross-linkable; blue phosphorescence; organic light-emitting diodes
资金
- National Program on Key Research Project [2017YFB0404400]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09020201]
- National Key R&D Program of China [2016YFB0401500, 2016YFB0401600]
- Science Foundation of Two sides of Strait (Key Program) [U1605244]
- Program on Key Research Project of Jiangsu Province of China [BE 2016173]
- National Natural Science Foundation of China (NSFC) [21402233]
- Natural Science Foundation of Jiangsu Province [BK20140387]
- Project on the Integration of Industry, Education and Research of Jiangsu Province [BY2014066]
- Prospective Application Research Program of Suzhou City [SYG201631]
- Youth Innovation Promotion Association CAS [2013206]
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 (similar to 3.20 eV) and highest occupied molecular orbital (similar to 06.50 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(-2), and a maximum EQE of 12.1% was obtained for the inkjet-printed device with 2,6-pyridine-based compound.
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