The development of metal complexes with Earth-abundant 3d transition metal ions as emitters for (PH)OLEDs, as dyes for DSSCs and sensor devices or as photocatalysts is very challenging, due to the typically fast non-radiative deactivation of the electronically excited states. Beyond the classically exploited luminescent charge transfer states, metal-centered states with small excited state distortion can become emissive. This is realized in so-called spin-flip emitters.<br/><br/>I will devise a deeper understanding of the fundamentals for high luminescence quantum yields and lifetimes followed by emerging applications of chromium(III) complexes, especially molecular ruby and its derivatives in sensing, catalysis, upconversion, and circularly polarized luminescence. Developments toward luminescent spin-flip emitters with Earth-abundant metal ions beyond chromium(III) will be reported.

Spin-flip and charge transfer excited states – what is the difference?

ACS Spring 2022

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