Investigation of Through-Space Interactions between Boron-Based Chromophores for Excimer Emission and Singlet Fission

• Applicant: Professor Dr. Andreas Lorbach
• Subject Area: Inorganic Molecular Chemistry - Synthesis and Characterisation
• Term: from 2015 to 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 272053498

Intermolecular interactions between chromophores or luminophores strongly affect the bulk photophysical properties of organic solids and therefore their performance in organic optoelectronic devices. The objective of this project is to elucidate such interactions by investigation of the intramolecular through-space communication between thoroughly arranged boron-based chromophores, e.g., boron quinolates and dipyrromethenes (BODIPYs). Firstly, versatile molecular platforms will be established which give ready access to a variety of systems with different cofacially oriented chromophores in a modular way. The information obtained from the characterization of these compounds will then be utilized to develop (i) novel molecular excimer emitters for applications in light-emitting devices and (ii) materials for singlet fission which are relevant in the field of organic photovoltaics. Different boron-bridged pi-conjugated ring systems will be utilized as rigid scaffolds in which the chromophores can be attached to the boron centers in the final reaction step. The electronic properties of the materials will then be elucidated by means of cyclic voltammetry and UV-vis absorption and emission spectroscopy at different temperatures (steady-state and time-resolved). Collaborative research could follow which then focuses on the application of the most promising candidates in optoelectronic devices.

• DFG Programme: Research Grants