Emission from outside of the emission layer in state-of-the-art phosphorescent organic light-emitting diodes

Mac Ciarnain R, Michaelis D, Wehlus T, Rausch AF, Danz N, Braeuer A, Tuennermann A (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Organic Electronics Elsevier

Book Volume: 44

Pages Range: 115-119

DOI: 10.1016/j.orgel.2017.02.006

Abstract

The emission zone profile in an organic light-emitting diode was extracted by fitting the experimentally measured far-field angular electroluminescence spectrum of a purposely designed device. It is based on a thin 10 nm emission layer doped with the red emitting phosphor Ir(MDQ)2acac. We find strong indications for light emission originating from outside of the emission layer, even though the device has electron and hole blocking layers. These are commonly assumed to completely confine the charge carrier recombination and hence the light emission to the emission layer. Since the calculated internal spectrum of the emission matches the emitter photoluminescence spectrum well, diffusion of the emitter molecules outside of the emission layer is hypothesized.

Involved external institutions

Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering DE Germany (DE) OSRAM OLED GmbH DE Germany (DE)

How to cite

APA:

Mac Ciarnain, R., Michaelis, D., Wehlus, T., Rausch, A.F., Danz, N., Braeuer, A., & Tuennermann, A. (2017). Emission from outside of the emission layer in state-of-the-art phosphorescent organic light-emitting diodes. Organic Electronics, 44, 115-119. https://dx.doi.org/10.1016/j.orgel.2017.02.006

MLA:

Mac Ciarnain, R., et al. "Emission from outside of the emission layer in state-of-the-art phosphorescent organic light-emitting diodes." Organic Electronics 44 (2017): 115-119.

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