Chemistry

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12 June 2019

Research Seminar: Understanding aggregation-induced emission in molecular crystals undergoing excited state proton transfer

Presented By Dr Rachel Crespo-Otero (Queen-Mary University of London)

About this event

Understanding aggregation-induced emission in molecular crystals undergoing excited state proton transfer 

Light emitting materials find applications in display technologies, optical communication, data storage, biological sensing and solid-state lasing. Aggregation-induced emission (AIE) offers a route for the development of luminescent technologies with high quantum efficiencies. Excited state intramolecular proton transfer (ESIPT) coupled with AIE can produce devices with emission across the visible spectrum. However, maximising fluorescence quantum efficiencies is a formidable challenge in attaining first-principles materials design, due to the interplay between the electronic structure of the chromophore and the molecular crystal. The identification of radiative and nonradiative channels, and how these are affected by aggregation, can rationalise the emissive properties of materials and aid in the design of yet more efficient fluorophores. In this talk, I will discuss how inter- and intramolecular processes determine the emissive properties in the crystal environment, where the population of nonradiative pathways is dictated by the electronic effects of the substituents and the degree of distortion allowed in the crystal environment.1,2 

1. M. Dommett and R. Crespo-Otero, Phys. Chem. Chem. Phys., 2017, 19, 2409–2416.

2. M. Dommett, M. Rivera and R. Crespo-Otero, J. Phys. Chem. Lett., 2017, 8, 6148–6153.