On the Orientation Mechanism of Nonpolar Dyes in Light-Emitting Guest–Host SystemsClick to copy article linkArticle link copied!
- Binh Minh NguyenBinh Minh NguyenInstitute of Physics, University of Augsburg, 86135 Augsburg, GermanyMore by Binh Minh Nguyen
- Markus SchmidMarkus SchmidInstitute of Physics, University of Augsburg, 86135 Augsburg, GermanyMore by Markus Schmid
- Johann KirschJohann KirschInstitute of Physics, University of Augsburg, 86135 Augsburg, GermanyMore by Johann Kirsch
- Albin Cakaj
- Wolfgang Brütting*Wolfgang Brütting*Email: [email protected]Institute of Physics, University of Augsburg, 86135 Augsburg, GermanyMore by Wolfgang Brütting
Abstract
Alignment of the emissive transition dipoles in organic guest–host systems is a powerful tool to enhance light outcoupling from organic light-emitting diodes. Here, we study the orientation mechanism of four nonpolar dyes in neat films and dye-doped guest–host systems with varying emitter concentrations. We find that the key factors controlling their alignment in thermally evaporated thin films are their shape anisotropy and the ratio between the temperature of the substrate, on which the film is grown, and the glass transition temperature of the guest–host system. However, care has to be taken when a mixed cohost system with largely different glass transition temperatures (Tg) of its constituents is used. In this case, the emitter orientation may not follow the effective Tg,mix of the mixed host. In addition, we suggest using the principal moments of inertia of a molecule for judging its resilience toward reorientation, and the derived aspect ratio to characterize its shape anisotropy.
Cited By
This article is cited by 1 publications.
- Shinian Cheng, Yejung Lee, Junguang Yu, Lian Yu, Mark D. Ediger. Generic Behavior of Ultrastability and Anisotropic Molecular Packing in Codeposited Organic Semiconductor Glass Mixtures. Chemistry of Materials 2024, 36
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, 3205-3214. https://doi.org/10.1021/acs.chemmater.3c02935
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