Pyridine-Based Electron-Transport Materials with High Solubility, Excellent Film-Forming Ability, and Wettability for Inkjet-Printed OLEDs

• DOI: 10.1021/acsami.7b12190
• Publication Date: 2017-10-10T09:36:32Z
• Authors: Changting Wei; Jinyong Zhuang; Dongyu Zhang; Wenrui Guo; Dongfang Yang; Zhongzhi Xie; Jianxin Tang; Wenming Su; Haibo Zeng; Zheng Cui
• Keywords: HOMO/LUMO

Film morphology has predominant influence on the performance of multilayered organic light-emitting diodes (OLEDs), whereas there is little reported literature from angle molecular level to investigate impact film-forming ability and device performance. In this work, four isomeric cross-linkable electron-transport materials constructed with pyridine, 1,2,4-triazole, vinylbenzyl ether groups were developed for inkjet-printed OLEDs. Their lowest unoccupied orbital (∼3.20 eV) highest occupied (∼6.50 levels are similar, which mainly determined by 1,2,4-triazole groups. The triplet energies these compounds can be tuned 2.51 2.82 eV different coupling modes core where 2,6-pyridine-based compound value eV. formation solubility investigated. It was found that outperformed 2,4-pyridine, 2,5-pyridine, 3,5-pyridine-based compounds. spin-coated blue OLEDs based have achieved over 14.0% external quantum efficiencies (EQEs) at luminance 100 cd m–2, a maximum EQE 12.1% obtained compound.