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Effect of matrix anisotropy on the apparent emitter orientation in organic LED

: Danz, N.; Haase, N.; Morherr, A.; Pflumm, C.; Fritsch, B.; Michaelis, D.


Reineke, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Organic Electronics and Photonics: Fundamentals and Devices : 4-26 April 2018, Strasbourg, France
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10687)
ISBN: 978-1-5106-1901-2
ISBN: 978-1-5106-1900-5
Paper 106870U, 6 S.
Conference "Organic Electronics and Photonics: Fundamentals and Devices" <2018, Strasbourg>
Photonics Europe <2018, Strasbourg>
Fraunhofer IOF ()

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.