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Proceedings Paper

Influence of bilayer resist processing on p-i-n OLEDs: towards multicolor photolithographic structuring of organic displays
Author(s): Simonas Krotkus; Frederik Nehm; Robby Janneck; Shrujan Kalkura; Alex A. Zakhidov; Matthias Schober; Olaf R. Hild; Daniel Kasemann; Simone Hofmann; Karl Leo; Sebastian Reineke
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Paper Abstract

Recently, bilayer resist processing combined with development in hydrofluoroether (HFE) solvents has been shown to enable single color structuring of vacuum-deposited state-of-the-art organic light-emitting diodes (OLED). In this work, we focus on further steps required to achieve multicolor structuring of p-i-n OLEDs using a bilayer resist approach. We show that the green phosphorescent OLED stack is undamaged after lift-off in HFEs, which is a necessary step in order to achieve RGB pixel array structured by means of photolithography. Furthermore, we investigate the influence of both, double resist processing on red OLEDs and exposure of the devices to ambient conditions, on the basis of the electrical, optical and lifetime parameters of the devices. Additionally, water vapor transmission rates of single and bilayer system are evaluated with thin Ca film conductance test. We conclude that diffusion of propylene glycol methyl ether acetate (PGMEA) through the fluoropolymer film is the main mechanism behind OLED degradation observed after bilayer processing.

Paper Details

Date Published: 16 March 2015
PDF: 10 pages
Proc. SPIE 9360, Organic Photonic Materials and Devices XVII, 93600W (16 March 2015); doi: 10.1117/12.2080174
Show Author Affiliations
Simonas Krotkus, Technische Univ. Dresden (Germany)
Frederik Nehm, Technische Univ. Dresden (Germany)
Robby Janneck, Fraunhofer Institute for Organic Electronics (Germany)
Shrujan Kalkura, Fraunhofer-COMEDD (Germany)
Alex A. Zakhidov, Fraunhofer Institute for Organic Electronics (Germany)
Texas State Univ. (United States)
Matthias Schober, Fraunhofer Institute for Organic Electronics (Germany)
Olaf R. Hild, Fraunhofer Institute for Organic Electronics (Germany)
Daniel Kasemann, Technische Univ. Dresden (Germany)
Simone Hofmann, Technische Univ. Dresden (Germany)
Karl Leo, Technische Univ. Dresden (Germany)
Sebastian Reineke, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 9360:
Organic Photonic Materials and Devices XVII
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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