Inkjet printing for electroluminescent devices: emissive materials, film formation, and display prototypes

Abstract

Inkjet printing (IJP) is a versatile technique for realizing high-accuracy patterns in a cost-effective manner. It is considered to be one of the most promising candidates to replace the expensive thermal evaporation technique, which is hindered by the difficulty of fabricating low-cost, large electroluminescent devices, such as organic light-emitting diodes (OLEDs) and quantum dot light-emitting diodes (QLEDs). In this invited review, we first introduce the recent progress of some printable emissive materials, including polymers, small molecules, and inorganic colloidal quantum dot emitters in OLEDs and QLEDs. Subsequently, we focus on the key factors that influence film formation. By exploring stable ink formulation, selecting print parameters, and implementing droplet deposition control, a uniform film can be obtained, which in turn improves the device performance. Finally, a series of impressive inkjet-printed OLEDs and QLEDs prototype display panels are summarized, suggesting a promising future for IJP in the fabrication of large and high-resolution flat panel displays.

Graphical abstract

Keywords

inkjet printing (IJP) / inks system / film formation / organic light-emitting diodes (OLEDs) / quantum dot light-emitting diodes (QLEDs)

Luhua Lan received his B.S. degree in Information Display and Opto-Electronic technology from South China University of Technology, Guangzhou, China, in 2016. He is currently working toward his M.S. degree in Materials Physics and Chemistry in South China University of Technology, Guangzhou, China. His current research interests include interface optimization of OLEDs and QLEDs fabricated by solotion processing.

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Jianhua Zou is currently an Associate Research Fellow (2013) in the School of Material Science and Engineering at South China University of Technology (SCUT).He received his Bachelors degree in Materials Physics from North East University (China) in 2005, and his Ph.D. degree from the Physics Department at SCUT in 2010. His current research interests is device physics in organic electronics, including OLEDs and QLED. He has also published more than 50 papers on high-impact journals in these topics.

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Congbiao Jiang received his B.S. degree in Material Physics from Wuhan University of Science and Technology, Wuhan, China, in 2014. He is currently working toward his Ph.D. degree in Materials Physics and Chemistry in South China University of Technology, Guangzhou, China. His current research interests include photoelectric materials, technique optimization on inkjet printed electroluminescent decives and physics of device.

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Lei Wang received his B.S. degree in the department of Polymer Materials Science and Engineering from Hebei University of Technology in 2004, and his Ph.D. degree in Materials Physics from South China University of Technology (SCUT) in 2009. He is currently an Associate Research Fellow (2011) in the SCUT. His research interests include organic and inorganic semiconductor materials, devices and their process development, and he has done a large number of scientific research work in the field of OLED and metal oxide TFT.

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Junbiao Peng received his B.S. degree in Physics at Jilin University in 1984 and M.S. and Ph.D. degrees respectively in 1987 and 1993 in Changchun Institute of Physics (CIP), Chinese Academy of Sciences. In the subsequent years, he did his postdoc work in the Korea Institute of Science and Technology and the National Institute of Materials and Chemical Research (NIMC), Japan. In 2001, he joined the Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, as a full professor. His current research interests include design, characterization, and application of organic optoelectronic devices such as OLEDs, OPVs and TFTs.

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Acknowledgements

This work was supported by the National Key Basic Research and Development Program of China (Nos. 2015CB655004, 2016YFB0401005, and 2016YFF0203603), the National Natural Science Foundation of China (Grant Nos. 21673082, U1601651, and U1301243), Guangdong Science and Technology Plan (No. 2017B090901055), the Pearl River S&T Nova Program of Guangzhou (Nos. 201710010066, and 201610010052), the Fundamental Research Funds for the Central Universities (Nos. 2017MS008 and 2017ZD001), China Postdoctoral Science Foundation (No. 2017T100627) and the Tiptop Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program (Nos. 2015TQ01C777, and 2016TQ03C331).

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