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Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores

Abstract : Several photophysical properties of chromo-phores depend crucially on intermolecular interactions. Thermally-activated delayed fluorescence (TADF) is often influenced by close packing of the chromophore assembly. In this context, the metal-organic framework (MOF) approach has several advantages: it can be used to steer aggregation such that the orientation within aggregated structures can be predicted using rational approaches. We demonstrate this design concept for a DPA-TPE (diphenyl-amine-tetraphenylethylene) chromophore, which is non-emissive in its solvated state due to vibrational quenching. Turning this DPA-TPE into a ditopic linker makes it possible to grow oriented MOF thin films exhibiting pronounced green electroluminescence with low onset voltages. Measurements at different temperatures clearly demonstrate the presence of TADF. Finally, this work reports that the layer-by-layer process used for MOF thin film deposition allows the integration of the TADF-DPA-TPE in a functioning LED device.
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Submitted on : Thursday, November 19, 2020 - 9:58:13 AM
Last modification on : Friday, November 20, 2020 - 3:12:35 AM

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Ritesh Haldar, Marius Jakoby, Mariana Kozlowska, Motiur Rahman, Hongye Chen, et al.. Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores. Chemistry - A European Journal, Wiley-VCH Verlag, 2020, 2020, pp.1 - 6. ⟨10.1002/chem.202003712⟩. ⟨hal-03013715⟩

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