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White OLED (WOLED) and Charge Generation Layer (CGL)

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Handbook of Organic Light-Emitting Diodes

Abstract

White organic light-emitting devices (OLEDs) have attracted considerable interest for use in solid-state flat-panel lighting. The operational lifetime of OLEDs decreases with increasing current density or luminance because the larger the number of holes and electrons passes through organic layer, the more electrochemical side reactions of organic compounds occur. A particular approach to solve this issue is tandem structure of OLEDs, in which plural light-emitting units (LEUs) are stacked in series through a charge generation layer (CGL). The tandem OLEDs have been fabricated to attain long operational lifetimes under high luminance. In addition, electron injection layers (EILs) are also important to reduce electron injection barrier from the CGL into the first LEU. Tandem OLEDs with two LEUs can exhibit a twofold increase in luminance compared with a single LEU device under an identical current density. Therefore, current efficiency and operational lifetime of tandem OLEDs can also be improved in comparison with those of conventional single LEU OLEDs. This tandem structure is now used in the actual application of OLED for white lighting manufactured in the industry.

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Authors and Affiliations

  1. Graduate School of Organic Materials Science, Research Center for Organic Electronics, Yamagata University, Yamagata, Japan

    Takayuki Chiba, Yong-Jin Pu & Junji Kido

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  1. Takayuki Chiba
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  2. Yong-Jin Pu
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  3. Junji Kido
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Correspondence to Yong-Jin Pu .

Editor information

Editors and Affiliations

  1. Department of Applied Chemistry and Biochemistry, Kyushu University, Fukuoka, Japan

    Chihaya Adachi

  2. Art, Science and Technology Center for Cooperative Research, Kyushu University KASTEC, Fukuoka, Japan

    Reiji Hattori

  3. Institute for Chemical Research Division of Environmental Chemistry, Kyoto University, Kyoto, Japan

    Hironori Kaji

  4. Konica Minolta Pioneer OLED, Inc., Konica Minolta, Inc., Tokyo, Japan

    Takatoshi Tsujimura

Section Editor information

  1. OLED Business Unit, Konica Minolta Inc., Tokyo, Japan

    Takatoshi Tsujimura

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Chiba, T., Pu, YJ., Kido, J. (2018). White OLED (WOLED) and Charge Generation Layer (CGL). In: Adachi, C., Hattori, R., Kaji, H., Tsujimura, T. (eds) Handbook of Organic Light-Emitting Diodes. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55761-6_20-1

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  • DOI: https://doi.org/10.1007/978-4-431-55761-6_20-1

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