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A1 (Müller)

Designing Conformationally Constrained Fluorophores with Delayed Fluorescence

Principal Investigator: Prof. Thomas J. J. Müller
Doctoral Researcher: Julia Wiefermann
Associated Doctoral Researcher: Laura Kloeters

Abstract:

One-pot transformations are valuable preparative tools in rapid diversity-oriented syntheses of functional chromophores for establishing systematic structure-property relationships by physical organic methods and for optimization of the optical and electronic properties. Moreover, by a tight interplay between experiment and theory design principles of peculiar donor-acceptors systems with efficient thermally activated (delayed) fluorescence (TA(D)F) can be conceived, synthesized and tested in organic light-emitting diodes (OLED). In a proof of principle study a first donor-acceptor bi(hetero)aryl system with conformational constraints has been accessed by a one-pot Masuda-Suzuki sequence and successfully probed for TADF. This molecular design can be broadly varied and model systems will be selected for elucidating the mechanistic pathways of ISC (intersystem crossing) and its reverse (RISC). This project plans to systematically expand synthetic routes to conformationally distorted bi(hetero)aryl donor-acceptor dyads with fused and substituted triarylamine donors and (di)azine or dicyanoaryl acceptors by employing one-pot metalation-coupling strategies. All novel chromophores will be intensively characterized by optical spectroscopy, cyclic voltammetry, and physical organic correlation studies.

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