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    Inkjet-Printed Small-Molecule Organic Light-Emitting Diodes: Halogen-Free Inks, Printing Optimization, and Large-Area Patterning

    Year: 2017

    Journal: ACS Appl. Mater. Interfaces, Volume 9, NOV 22, page 40533–40540

    Authors: Zhou, Lu; Yang, Lei; Yu, Mengjie; Jiang, Yi; Liu, Cheng-Fang; Lai, Wen-Yong; Huang, Wei

    Organizations: National Key Basic Research Program of China (973 Program) [2014CB648300, 2017YFB0404500]; National Natural Science Foundation of China [21422402, 21674050, 20904024]; Natural Science Foundation of Jiangsu Province [BK20140060, BK20130037, BK20140865, BM2012010]; China Post-doctoral Science Foundation [2016M601856]; Natural Science Foundation of Jiangsu Higher Education Institutions [17KJB510039]; Program for Jiangsu Specially-Appointed Professor [RK030STP15001]; Program for New Century Excellent Talents in University [NCET-13-0872]; Ministry of Education of China [IRT1148]; NUPT "1311 Project" and Scientific Foundation [NY213119, NY213169]; Synergetic Innovation Center for Organic Electronics and Information Displays; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); 333 Project [BRA2015374]; Qing Lan Project of Jiangsu Province

    Keywords: inkjet printing; small molecules; large-area patterning; organic light-emitting diodes (OLEDs); halogen-free inks

    Manufacturing small-molecule organic light-emitting diodes (OLEDs) via inkjet printing is rather attractive for realizing high-efficiency and long-life-span devices, yet it is challenging. In this paper, we present our efforts on systematical investigation and optimization of the ink properties and the printing process to enable facile inkjet printing of conjugated light-emitting small molecules. Various factors on influencing the inkjet-printed film quality during the droplet generation, the ink spreading on the substrates, and its solidification processes have been systematically investigated and optimized. Consequently, halogen-free inks have been developed and large-area patterning inkjet printing on flexible substrates with efficient blue emission has been successfully demonstrated. Moreover, OLEDs manufactured by inkjet printing the light-emitting small molecules manifested superior performance as compared with their corresponding spin-cast counterparts.
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