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Mapping Triplet-to-Singlet Förster-type Intramolecular Energy Transfer Utilising Transient Absorption and Fluorescence Spectroscopy

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Mapping Triplet-to-Singlet Förster-type Intramolecular Energy Transfer Utilising Transient Absorption and Fluorescence Spectroscopy

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Controlling excited state energetics between molecules to harness and transfer energy is paramount in light-based applications, from photocatalysis to medical imaging to design of next generation organic light-emitting diodes (OLEDs). Triplets state emission (phosphorescence) is a forbidden spin transition, however, statistically 75% of all excited states formed are triplets, which is a tremendous amount of energy lost when trying to make highly efficient devices. Specifically, OLED performance can be drastically improved if triplets can be converted back into highly emissive singlets, especially those that rely on carefully selected excited state energy levels to drive Förster-type energy transfers that are more efficient than thermally activated delayed fluorescence (TADF) and heavy atom systems.

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