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Microfluidic Organic Light-Emitting Devices Using Liquid Organic Semiconductors

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Organic Electronics Materials and Devices

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Abstract

Since a first liquid organic light-emitting diode (liquid OLED) was proposed by Xu and Adachi in 2009, liquid organic semiconductors have been considered to be promising materials for novel electronic device applications. Although the luminescent characteristics of liquid OLEDs have been improved over the past few years, from the viewpoint of device structure, there are technical challenges associated with multicolor light emissions on a single device. In general, liquid OLEDs are simply fabricated by sandwiching a liquid emitter between two electrode-patterned glass substrates, and the thickness of the emitting layer is controlled with single-μm-thick spacer materials. Therefore, the development of integration method for multiple liquid OLEDs on a single device is an important step toward next-generation liquid-based displays. This chapter provides a brief overview of the authors’ own recent researches on the microfluidic OLEDs which are novel liquid OLEDs combined with microfluidic technology. The following topics are discussed in this chapter: research background, fabrication methodologies for single-μm-thick electro-microfluidic devices using a novel exposure method and a heterogeneous bonding technique through the use of self-assembled monolayers, and demonstration of multicolor microfluidic OLEDs with the pyrene-based liquid organic semiconductors. The proposed microfluidic OLEDs are believed to open a new possibility for future liquid-based electronic devices.

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Acknowledgements

This work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) and the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) sponsored by the Japan Ministry of Education, Culture, Sports Science and Technology (MEXT) and Grants-in-Aid for Scientific Basic Research (S) No. 23226010 and for Scientific Basic Research (B) No. 25289241. The authors thank MEXT Nanotechnology Platform Support Project of Waseda University. The authors would like to acknowledge Prof. Chihaya Adachi (Kyushu University), Prof. Shuichi Shoji (Waseda University), Dr. Tomohiko Edura (Kyushu University), Dr. Shigeyuki Matsunami (Kyushu University), Prof. Toshihiko Imato (Kyushu University), Dr. Ryoichi Ishimatsu (Kyushu University), Dr. Juro Oshima (Nissan Chemical Industries, Ltd.), Mr. Osamu Uesugi (Nissan Chemical Industries, Ltd.), and Ms. Miho Tsuwaki (Waseda University) for valuable discussion and insightful suggestions.

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  1. Department of Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan

    Takashi Kasahara

  2. Research Organization for Nano and Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo, 162-0041, Japan

    Jun Mizuno

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Correspondence to Jun Mizuno .

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    Shuichiro Ogawa

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Kasahara, T., Mizuno, J. (2015). Microfluidic Organic Light-Emitting Devices Using Liquid Organic Semiconductors. In: Ogawa, S. (eds) Organic Electronics Materials and Devices. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55654-1_9

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