One of the key factors that determines organic device performance is the specific molecular structure and function of organic materials in thin films, strongly governed by molecular conformational changes during operation. In this talk, the formation and dynamics of molecular conformation in blue light-emitting polymers will be first discussed. By probing in real time the evolution of fluorescence spectra of single polymer chains, we identify dynamic molecular conformation-controlled photophysical processes and their impact on device performance. Second, the importance of molecular conformational changes in organic photoconversion small molecules will be presented. Their effects on energetics, intermolecular interactions, and hence device performance and stability will be highlighted.
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