On the Orientation Mechanism of Nonpolar Dyes in Light-Emitting Guest–Host Systems

PaperPhelos
Written By Fluxim AG

Binh Minh Nguyen, Markus Schmid, Johann Kirsch, Albin Cakaj, and Wolfgang Brütting

Chemistry of Materials 2023 35 (17), 7333-7343

DOI: 10.1021/acs.chemmater.3c01804

The research explores how four nonpolar dyes orient within neat films and doped guest-host systems in organic light-emitting diodes (OLEDs). It identifies shape anisotropy and the relationship between the substrate temperature during deposition and the system's glass transition temperature (Tg) as critical to the alignment of emissive transition dipoles. Notably, in mixed cohost systems with components of differing Tgs, the alignment may not align with the mixed host's effective Tg. The study also proposes using a molecule's principal moments of inertia to assess its reorientation resilience and aspect ratio to gauge shape anisotropy.

How Phelos was used

Angular-Dependent Photoluminescence measurements were performed with Phelos.

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