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Proceedings Paper

Effect of matrix anisotropy on the apparent emitter orientation in organic LED
Author(s): Norbert Danz; Nils Haase; Antonia Morherr; Christof Pflumm; Birk Fritsch; Dirk Michaelis
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Paper Abstract

Spontaneously aligning emitter molecules can improve the external efficiency of OLED devices and have been reported for different types of emitters doped into suitable hosts. Similar to the morphological alignment of the active molecules, a birefringence of the host affects the apparent emitter orientation. In order to investigate this effect experimentally, Ir(ppy)3 is co-evaporated into the emitting layer of OLED using hosts with different birefringence properties. Analyzing the electroluminescence emission patterns quantitatively reveals the apparent orientation distribution of the emitters. The results emphasize that host birefringence can be used to suppress perpendicular emitter contributions while amplifying the impact of the horizontal dipoles, thus leading to an enhanced forward emission.

Paper Details

Date Published: 22 May 2018
PDF: 6 pages
Proc. SPIE 10687, Organic Electronics and Photonics: Fundamentals and Devices, 106870U (22 May 2018); doi: 10.1117/12.2306408
Show Author Affiliations
Norbert Danz, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Nils Haase, Merck KGaA (Germany)
Antonia Morherr, Merck KGaA (Germany)
Christof Pflumm, Merck KGaA (Germany)
Birk Fritsch, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Dirk Michaelis, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)


Published in SPIE Proceedings Vol. 10687:
Organic Electronics and Photonics: Fundamentals and Devices
Sebastian Reineke; Koen Vandewal, Editor(s)

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