Advanced Materials

Monolithic Integration of Multi-Color Organic LEDs by Grayscale Lithography

Authors

  • Malte C. Gather,

    1. Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Cologne (Germany)
    Current affiliation:
    1. Present address: Wellman Center for Photomedicine, Harvard Medical School, 40 Blossom Street, Boston, MA 02114 (USA)
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  • Nils M. Kronenberg,

    1. Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Cologne (Germany)
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  • Klaus Meerholz

    Corresponding author
    1. Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Cologne (Germany)
    • Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Cologne (Germany).
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Abstract

A single step process to fabricate arrays of organic LEDs with emission colors across the entire visible spectrum is introduced (see picture). This multi-color monolithic integration of OLEDs is enabled by a grayscale lithography scheme that inscribes thickness profiles into crosslinkable hole-transport layers. When introduced into a micro-cavity OLED, these thickness variations translate into shifts of the resonant wavelength of the cavity.

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