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    Universally applicable small-molecule co-host ink formulation for inkjet printing red, green, and blue phosphorescent organic light-emitting diodes

    Year: 2021

    Journal: Org. Electron., Volume 96, SEP

    Authors: Liu, Lihui; Chen, Dingfu; Xie, Juxuan; Piao, Junxian; Liu, Yadong; Wang, Wei; Cao, Kun; Chen, Shufen

    Organizations: National Key Research and Development Program of China [2017YFB0404501]; National Major Fundamental Research Program of China [91833306]; National Nature Science Foundation of China [61705111, 61704091, 62074083, 62005131]; Science Fund for Distinguished Young Scholars of Jiangsu Province [BK20160039]; Natural Science Foundation of Jiangsu Province [BK20170899]; Natural Science Fund for Colleges and Universities in Jiangsu Province [20KJA510005]; Priority Academic Program Development of Jiangsu Higher Education Institutions [YX030003]; Synergetic Innovation Center for Organic Electronics and Information Displays

    Keywords: Organic light-emitting diodes; Inkjet printing; Small-molecule co-host; Phosphorescence

    For organic light-emitting diodes (OLEDs), inkjet printing technology is being developed as an alternative to the traditional vacuum evaporation, because of its precise patterning, high-efficient material utilization, large-area compatibility and low-cost. In this work, we report a universal ink formulation of small-molecule co-host and binary solvents for red, green and blue phosphorescent OLEDs. Moreover, the effect of hole-transporting layers on the ink spreading, film uniformity and exciton confinement ability is investigated. Furthermore, a large-area (170 mm x 170 mm) and homogeneous light-emitting film is inkjet-printed. Finally, red, green and blue OLEDs are successfully constructed using these optimized ink formulations on the solvent resistance hole-transporting layer. This work can reduce the complexity to adjust the host materials and solvents for different color inks, and could be applied in large-area and low-cost OLED displays with high resolution.
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